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REVIEW 3 major objections 4 minor 66 references

Quantum sensing composite excitations in an anisotropic ferromagnet via a qubit

T0 review · 3 major / 4 minor · reviewed 2026-08-15 · deepseek-v4-flash

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Pith's one-line read A qubit dispersively coupled to the noneigenmode magnon of an anisotropic ferromagnet can resolve the internal Fock-state superpositions of any squeezed magnon excitation, with spectral peak heights encoding the superposition coefficients.

desk verdict A credible theoretical extension of qubit spectroscopy to excited squeezed magnon states, but the 'any excitation' claim leans on an experimentally ungrounded large dispersive coupling. read the letter →

arxiv 2608.09463 v1 pith:BVLQ4TDZ submitted 2026-08-10 cond-mat.mes-hall quant-ph

Amey S. Rodge , Tarek Moussa , Akashdeep Kamra , Bashab Dey This is my paper · ORCID
classification cond-mat.mes-hallquant-ph
keywords qubitspectroscopysqueezedmagnonsanisotropicferromagnetdispersivecouplingFock-statesuperpositionsqueezeoperatorquantumsensing
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper argues that a qubit directly coupled to a magnon mode can do more than count magnons: it can read out the internal quantum structure of a squeezed magnon, the natural excitation of an anisotropic ferromagnet. A squeezed magnon $|n\rangle$ is a superposition of ordinary magnon-number states $|m\rangle$, and the paper shows that in a qubit spectrum this superposition appears as a set of resonances whose heights are proportional to the squared coefficients of that superposition. The authors derive closed-form coefficients for the first few squeezed excitations, simulate the full open-quantum-system spectroscopy, and show the protocol also works for a coherent state of squeezed magnons generated by resonant driving. They identify spectral crowding and finite temperature as the main practical limits. If the claim holds, qubit spectroscopy becomes a general tool for sensing nonclassical composite spin excitations rather than just counting their number states.

What carries the argument

The load-bearing object is the effective squeezing operator $\hat{S}(\xi_{\rm eff}) = \exp\big((\xi_{\rm eff}^* \hat{a}^2 - \xi_{\rm eff} \hat{a}^{\dagger 2})/2\big)$ with $\xi_{\rm eff}=r_{\rm eff} e^{i\theta}$ and $r_{\rm eff}=r_g-r_e$, where $r_g$ and $r_e$ are the magnon squeezing parameters in the qubit ground and excited states. The direct dispersive coupling $\chi \hat{a}^\dagger \hat{a} \hat{\sigma}_z$ makes those two squeezing parameters differ, and the transformation $|n\rangle_g = \hat{S}(\xi_{\rm eff})|n\rangle_e$ carries the magnon's superposition information into the qubit transition amplitudes. The multivalued qubit frequencies $\omega_{mn}$ then assign each spectral peak to a specific Fock-state component, and the peak heights encode the probabilities $|C_{m,n}(\xi_{\rm eff})|^2$.

What would settle it

Prepare the magnon in $|1\rangle_g$ and measure the qubit spectrum while varying the dispersive coupling $\chi$ or the in-plane anisotropy $B$; if the ratio of the $\omega_{31}$ peak height to the $\omega_{11}$ peak height does not track $|C_{3,1}(r_{\rm eff})/C_{1,1}(r_{\rm eff})|^2$, the claim that peak heights encode the superposition coefficients is wrong.

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Extended reading notes

Core claim

The central claim is that the qubit spectroscopy can detect any squeezed magnon excitation of an anisotropic magnet: states $|n\rangle_g$ produce resonances at frequencies $\omega_{mn} = m\omega^e_\alpha - n\omega^g_\alpha + \omega_q - \chi + (\omega^e_\alpha - \omega^g_\alpha)/2$, and the height of each resonance is proportional to $|C_{m,n}(\xi_{\rm eff})|^2$, the squared overlap between the squeezed magnon states in the qubit ground and excited configurations. Because the dispersive coupling changes the effective anisotropy seen by the magnon, the qubit ground and excited states host magnons squeezed by different amounts, so $|n\rangle_g$ is related to $|m\rangle_e$ by an effective squeeze operator with $r_{\rm eff}=r_g-r_e$. Fitting the measured peak heights to the closed-form squeeze-operator coefficients reconstructs the superposition. The paper verifies this numerically for single, double, and superposed squeezed magnon excitations and for a low-amplitude coherent squeezed-magnon state, while documenting that finite temperature and spectral crowding degrade the weaker peaks.

Load-bearing premise

The load-bearing premise is a direct dispersive coupling $\chi \hat{a}^\dagger \hat{a} \hat{\sigma}_z$ strong enough that the magnon squeezing differs appreciably between the qubit states; the simulations assume $\chi/\omega_q = 0.2$, far above typical dispersive readout shifts, and use a single-mode ($k=0$) description of the magnon.

Editorial extensions

If this is right

  • A single qubit spectrum distinguishes squeezed magnon number states by parity: even-$n$ excitations produce even-$m$ resonances and odd-$n$ excitations produce odd-$m$ resonances.
  • Superposition amplitudes can be extracted from the spectrum, because a state $k_0|0\rangle_g + k_1|1\rangle_g$ gives peak heights proportional to $|k_0|^2|C_{m,0}|^2$ and $|k_1|^2|C_{m,1}|^2$.
  • The protocol supplies design equations for choosing qubit linewidth and drive strength so that spectral crowding does not hide the transitions that carry the superposition information.
  • A coherent squeezed-magnon state generated by resonant magnon driving can be sensed without the qubit drive destroying it, provided the qubit response is recorded shortly after the probe is switched on.
  • At nonzero temperature the weaker transitions no longer match the predicted probabilities, so practical sensing will need low temperatures or a different probe type for high-temperature operation.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • Beyond the paper: because the off-diagonal peaks all scale with $r_{\rm eff} = r_g - r_e$, an experimental realization needs a dispersive coupling $\chi$ far larger than the about $10^{-3}\omega_q$ typical of circuit-QED dispersive readout; the simulations' $\chi/\omega_q = 0.2$ is an optimistic operating point.
  • Beyond the paper: the same effective-squeezing readout should extend to two-mode squeezed magnons in antiferromagnets, where the qubit would report on entangled magnon pairs rather than a single squeezed mode.
  • Beyond the paper: a clean experimental test of the mechanism is to vary the in-plane anisotropy $B$ at fixed qubit coupling and check that the off-diagonal peak ratios track the predicted $r_{\rm eff}$ dependence, not the bare squeezing $r$.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 4 minor

Summary. The paper theoretically proposes and simulates a qubit-spectroscopy protocol for sensing the internal Fock-state superpositions of squeezed magnon excitations in an anisotropic ferromagnet. The model couples a qubit to the noneigenmode magnon operator a via a dispersive interaction χ a†a σ_z, so that the effective squeezing of the magnon mode differs between the qubit ground and excited states. This difference produces a multivalued qubit frequency whose peak heights are proportional to the squared overlap coefficients |C_{m,n}(r_eff)|^2 between the squeezed states in the two qubit sectors. The authors derive closed-form coefficients for the single- and double-squeezed-magnon excitations, simulate the spectroscopy for |1>_g, |2>_g, a superposition of |0>_g and |1>_g, and a coherent squeezed-magnon state prepared by a magnon drive, and they discuss spectral crowding and finite-temperature limitations. The central claim is that the protocol can detect any squeezed magnon excitation of an anisotropic magnet.

Significance. If the protocol is realizable with the parameters assumed, it would be a valuable extension of the earlier ground-state sensing work in Ref. 30, adding excited-state and superposition-state readout and providing explicit design equations. The paper's strengths are its explicit closed-form expressions for the squeezed-state expansion coefficients, the master-equation simulations that include both qubit and magnon decay channels, and the candid treatment of spectral crowding and finite-temperature degradation. The internal algebra appears consistent, and the simulated peak heights agree with the analytical coefficients to within about 3% for the n=1 and n=2 cases shown. The main limitation is that the new physics rests on an unquantified and very large direct dispersive coupling χ/ω_q on the order of 0.2, far above the values typical of dispersive readout; the practical significance is therefore conditional on this strong-coupling premise being experimentally justified.

major comments (3)
  1. [Sec. III B, Eq. (12), Fig. 3] The central claim that the qubit spectroscopy can detect any squeezed magnon excitation rests on the off-diagonal overlaps |C_{m,n}(r_eff)|^2, which for m≠n scale as (tanh r_eff)^{|m-n|}. The simulations use χ/ω_q=0.2, giving r_eff on the order of 0.2–0.4 and visible off-diagonal peaks. However, the paper provides no microscopic estimate for the direct dispersive coupling χ in Eq. (9), and for typical dispersive-readout values χ/ω_q ~ 10^-3, r_eff is correspondingly small and all informative off-diagonal peaks vanish; the scheme then reduces to ordinary number-splitting readout. Since the off-diagonal peaks are precisely what carries the superposition information, the demonstration in Fig. 3 is conditional on an unverified strong-coupling assumption. Please add a feasibility estimate for χ in the proposed platform, or explicitly state the required strong-coupling regime as an open experimental condition.
  2. [Sec. III B, paragraph after Fig. 3] The sentence 'This shows that the qubit spectroscopy can detect any squeezed magnon excitation' overstates the evidence presented. Only n=1 and n=2 are explicitly simulated, and Sec. V itself documents spectral crowding that prevents resolution of peaks in higher manifolds (e.g., ω_33, ω_46). The extrapolation to arbitrary n is therefore not demonstrated and should be qualified, for example by stating the condition of sufficiently low n and sufficiently narrow qubit linewidths.
  3. [Sec. IV, Fig. 4] The two-step noninvasive spectroscopy protocol is central to the coherent-state sensing result, but the main text describes it only in a few sentences and defers the quantitative details to the Supplementary Material. In particular, the time Δt≈0.11/κ_q at which the qubit excitation is recorded, the normalization of the colored bars relative to the black curve, and the criterion for selecting 'dominant channels' are not specified in the main text. As this protocol underpins the coherent-state-sensing claim, please provide the missing details or a precise pointer to the SM procedure, and include the error analysis needed to judge the agreement shown in Fig. 4.
minor comments (4)
  1. [Fig. 3(c) caption] The caption writes the superposition state as |ψ>_g = k_0|0>_g + k_1|0>_g; the second term should be k_1|1>_g.
  2. [Sec. II A, Eqs. (5)–(8)] The derivation of the expansion coefficients is deferred to the SM; since Eq. (6) is used directly in the peak-height comparison, a brief outline of the derivation or a reference to the specific SM section in the main text would improve readability and verifiability.
  3. [Sec. IV, parameter list] The parameters used in Fig. 4 (A=0.2ω_q, B=ω_q/16) give ω_α/ω_q ≈ 0.156, which differs from the value 0.5 used in Fig. 3; this is not an error, but the difference should be stated explicitly so the reader does not assume the same dimensionless ratios carry over.
  4. [Sec. V, Fig. 5] The text lists ω_20, ω_33, and ω_46 as examples of near-degenerate transitions; the figure caption uses slightly different notation and does not mark all of them. Please ensure the text and figure markers correspond exactly.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: the qubit-spectroscopy predictions follow from the stated Hamiltonian and standard squeezed-state algebra, with master-equation simulations as independent checks; the large-coupling assumption is a feasibility concern, not a circular step.

full rationale

The derivation chain is self-contained and non-circular. The analytical peak-height coefficients are computed from standard squeeze-operator matrix elements (Eqs. (5), (6), and (8) with ξ replaced by ξ_eff), where ξ_eff = r_g - r_e follows from the composition of the two squeeze transformations (Eq. (12)); the transition frequencies ω_mn follow by direct diagonalization of the qubit-state-dependent Hamiltonians (Eq. (13)). The master-equation simulations solve the same Hamiltonian (Eq. (9)) without fitting the peak heights, so the agreement with the analytical bars is a genuine numerical verification of the algebra, not a fitted parameter renamed as a prediction. The cited prior work (Refs. 30 and 59) supplies the dispersive-coupling model and the ground-state sensing result; Ref. 30 is a published, independently assessable result, and the present extension to excited states does not reduce to it. The large value χ/ω_q = 0.2 used in Fig. 3 is an assumption about device parameters; if χ is small, the off-diagonal peaks vanish. That is a feasibility or correctness limitation, not a circularity, because the paper does not define the target result in terms of that assumption. No self-definitional step, fitted-input-as-prediction, or load-bearing self-citation chain is present.

Assumptions & free parameters 4 free parameters · 5 assumptions · 0 invented entities

No free parameters are fitted to external data; all simulation parameters are representative choices. The central assumption is the availability of a strong direct dispersive coupling to the noneigenmode magnon, which is not experimentally established. The paper introduces no new physical entities beyond the known squeezed magnon and the standard dispersive qubit coupling.

free parameters (4)
  • dispersive coupling strength χ/ω_q = 0.2 (Fig. 3), 0.05 (Fig. 4)
    Chosen by hand to produce resolvable peaks. The protocol requires r_eff large enough that off-diagonal transitions C_{m,n}(r_eff) have measurable weight; this is the key assumption affecting feasibility.
  • squeezing parameter r (or anisotropy ratio B/A) = r=0.3 (Fig. 3); B=ω_q/16 (Fig. 4)
    Input material parameter representing the in-plane anisotropy of the ferromagnet. Not fitted to external data, but the specific value sets the visible peak multiplicities.
  • qubit decay rate κ_q/ω_q = 0.1 (Fig. 3), 0.00075 (Fig. 4)
    Chosen to illustrate the effect of linewidth on peak resolution; the paper notes that narrower linewidths are needed for higher excitations.
  • magnon decay rate κ_m/ω_q = 0.0005 (Fig. 4)
    Chosen to model realistic magnon dissipation in the coherent-state generation simulation.
assumptions (5)
  • domain assumption Holstein-Primakoff transformation and single-mode (k=0) approximation
    The magnet is described by a single uniform magnon mode a; other magnon modes are neglected (Sec. II).
  • domain assumption The magnon Hamiltonian has the quadratic form A a†a + B a^2 + B* a†2 (Eq. 2)
    Standard for an anisotropic ferromagnet with single-ion anisotropy; neglects magnon-magnon interactions and higher-order terms.
  • domain assumption A direct dispersive coupling χ a†a σ_z can be engineered between a qubit and the noneigenmode magnon (Eq. 9)
    Relies on the proposal in Ref. 59; no experimental demonstration yet. This is the load-bearing premise for the whole protocol.
  • standard math Lindblad master equation with weak coupling to a thermal bath (Eq. 14 and SM)
    Standard open-quantum-system description; the joint decay version used in Sec. IV relies on an unpublished reference (Ref. 67).
  • standard math Squeezed Fock state expansion coefficients C_{m,n} are taken from standard quantum optics
    Uses known results from Gerry and Knight and Kim, de Oliveira, and Knight, with closed forms for n=1,2 derived in the SM.

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Cite this review

Pith. "Pith review of Quantum sensing composite excitations in an anisotropic ferromagnet via a qubit." pith.science (2026). https://pith.science/paper/BVLQ4TDZ

@misc{pith2026260809463,
  author       = {Pith},
  title        = {Pith review of: Quantum sensing composite excitations in an anisotropic ferromagnet via a qubit},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/BVLQ4TDZ}},
  note         = {Machine review of arXiv:2608.09463}
}
read the original abstract

Ordered magnets harbor intrinsically squeezed ground states and magnonic excitations characterized by entanglement between spins and nonclassical magnon number composition. A pathway to detecting the superpositions of noneigenmode magnon number states underlying these nonclassical magnetic ground states has recently been demonstrated by utilizing a qubit coupled to the magnon mode via a direct dispersive interaction. Here, we theoretically develop this qubit spectroscopy further delineating the capabilities and limitations of this qubit spectroscopy for sensing the quantum superpositions that underlie the excited states. We demonstrate that the spectroscopy lends itself naturally to unraveling the superpositions that underlie the various quantized squeezed-magnon number states. However, excited states comprising superpositions of multiple squeezed Fock states become increasingly hard due to the large number of possible transitions, and resulting peaks, in the qubit spectroscopy thereby requiring qubits with narrower linewidths. Along the same lines, we theoretically demonstrate the qubit spectroscopy of a low amplitude coherent squeezed-magnon state analyzing the tradeoff between frequency crowding due to multiple transitions and peak linewidths. Our work lays the groundwork and design equations for deploying high-quality qubits towards sensing the composite nature of spin excitations in magnetic systems.

Figures

Figures reproduced from arXiv: 2608.09463 by the authors.

Figure 1
Figure 1. FIG. 1. (a) Schematic depiction of the system. The noneigenmode magnon (left) with annihilation operator ˆa [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. FIG. 2. (a) Simulation protocol of the qubit spectroscopy. The [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 4
Figure 4. FIG. 4. Qubit excitation as a function of the qubit drive frequency for [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figures from the paper (2 more)
Figure 5
Figure 5. Figure 5: FIG. 5. Resonant transition frequencies [PITH_FULL_IMAGE:figures/full_fig_p007_5.png]
Figure 6
Figure 6. Figure 6: FIG. 6. Qubit excitation as a function of the qubit drive frequency for [PITH_FULL_IMAGE:figures/full_fig_p008_6.png]

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Works this paper leans on

66 extracted references · 35 canonical work pages

  1. [1]

    Holstein \ and\ author H

    author author T. Holstein \ and\ author H. Primakoff ,\ title title Field dependence of the intrinsic domain magnetization of a ferromagnet , \ https://doi.org/10.1103/PhysRev.58.1098 journal journal Phys. Rev. \ volume 58 ,\ pages 1098--1113 ( year 1940 ) NoStop

    doi:10.1103/physrev.58.1098

  2. [2]

    Yuan , author Y

    author author H. Yuan , author Y. Cao , author A. Kamra , author R. A. \ Duine ,\ and\ author P. Yan ,\ title title Quantum magnonics: When magnon spintronics meets quantum information science , \ https://doi.org/https://doi.org/10.1016/j.physrep.2022.03.002 journal journal Physics Reports \ volume 965 ,\ pages 1--74 ( year 2022 ) NoStop

    doi:10.1016/j.physrep.2022.03.002

  3. [3]

    Rezende \ and\ author N

    author author S. Rezende \ and\ author N. Zagury ,\ title title Coherent magnon states , \ https://doi.org/https://doi.org/10.1016/0375-9601(69)90788-9 journal journal Physics Letters A \ volume 29 ,\ pages 47--48 ( year 1969 ) NoStop

    work page doi:10.1016/0375-9601(69)90788-9

  4. [4]

    Sharma , author V

    author author S. Sharma , author V. A. S. V. \ Bittencourt , author A. D. \ Karenowska ,\ and\ author S. V. \ Kusminskiy ,\ title title Spin cat states in ferromagnetic insulators , \ https://doi.org/10.1103/PhysRevB.103.L100403 journal journal Phys. Rev. B \ volume 103 ,\ pages L100403 ( year 2021 ) NoStop

    work page doi:10.1103/physrevb.103.l100403

  5. [5]

    Kamra \ and\ author W

    author author A. Kamra \ and\ author W. Belzig ,\ title title Super-poissonian shot noise of squeezed-magnon mediated spin transport , \ https://doi.org/10.1103/PhysRevLett.116.146601 journal journal Phys. Rev. Lett. \ volume 116 ,\ pages 146601 ( year 2016 a ) NoStop

    work page doi:10.1103/physrevlett.116.146601

  6. [6]

    author author H. Y. \ Yuan \ and\ author R. A. \ Duine ,\ title title Magnon antibunching in a nanomagnet , \ https://doi.org/10.1103/PhysRevB.102.100402 journal journal Phys. Rev. B \ volume 102 ,\ pages 100402(R) ( year 2020 ) NoStop

    work page doi:10.1103/physrevb.102.100402

  7. [7]

    author author R. J. \ Glauber ,\ title title Coherent and incoherent states of the radiation field , \ https://doi.org/10.1103/PhysRev.131.2766 journal journal Phys. Rev. \ volume 131 ,\ pages 2766--2788 ( year 1963 ) NoStop

    doi:10.1103/physrev.131.2766 1963

  8. [8]

    author author C. C. \ Gerry \ and\ author P. L. \ Knight ,\ https://www.cambridge.org/core/books/introductory-quantum-optics/B9866F1F40C45936A81D03AF7617CF44 title Introductory Quantum Optics \ ( publisher Cambridge University Press ,\ address Cambridge ,\ year 2005 ) NoStop

    work page 2005

Show all 66 references
  1. [9]

    Lachance-Quirion , author Y

    author author D. Lachance-Quirion , author Y. Tabuchi , author S. Ishino , author A. Noguchi , author T. Ishikawa , author R. Yamazaki ,\ and\ author Y. Nakamura ,\ title title Resolving quanta of collective spin excitations in a millimeter-sized ferromagnet , \ https://doi.or...

    doi

  2. [10]

    Lachance-Quirion , author S

    author author D. Lachance-Quirion , author S. P. \ Wolski , author Y. Tabuchi , author S. Kono , author K. Usami ,\ and\ author Y. Nakamura ,\ title title Entanglement-based single-shot detection of a single magnon with a superconducting qubit , \ https://doi.org/10.1126/scien...

    doi

  3. [11]

    Wang , author Y

    author author H. Wang , author Y. Xiao , author M. Guo , author E. Lee-Wong , author G. Q. \ Yan , author R. Cheng ,\ and\ author C. R. \ Du ,\ title title Spin pumping of an easy-plane antiferromagnet enhanced by dzyaloshinskii--moriya interaction , \ https://doi.org/10.1103/...

    doi

  4. [12]

    Rani , author X

    author author S. Rani , author X. Cao , author A. E. \ Baptista , author A. Hoffmann ,\ and\ author W. Pfaff ,\ title title High-dynamic-range quantum sensing of magnons and their dynamics using a superconducting qubit , \ https://doi.org/10.1103/6dmm-mnxd journal journal Phys...

    doi

  5. [13]

    Shimizu , author T

    author author H. Shimizu , author T. Hioki , author S. Takeda ,\ and\ author E. Saitoh ,\ title title Tomography of parametric transition in magnets , \ https://doi.org/10.1103/v1rk-rtrq journal journal Phys. Rev. Lett. \ volume 135 ,\ pages 106701 ( year 2025 ) NoStop

    doi

  6. [14]

    \ Weng , author D

    author author Y.-C. \ Weng , author D. Xu , author Z. Chen , author L.-Z. \ Tan , author X.-K. \ Gu , author J. Li , author H.-F. \ Yu , author S.-Y. \ Zhu , author X. Hu , author F. Nori ,\ and\ author J. Q. \ You ,\ title title Magnon squeezing in the quantum regime , \ http...

    doi

  7. [15]

    Laucht , author F

    author author A. Laucht , author F. Hohls , author N. Ubbelohde , author M. Fernando Gonzalez-Zalba , author D. J. \ Reilly , author S. Stobbe , author T. Schröder , author P. Scarlino , author J. V. \ Koski , author A. Dzurak , author C.-H. \ Yang , author J. Yoneda , author ...

  8. [16]

    author author S. N. \ Andrianov \ and\ author S. A. \ Moiseev ,\ title title Magnon qubit and quantum computing on magnon bose-einstein condensates , \ https://doi.org/10.1103/PhysRevA.90.042303 journal journal Phys. Rev. A \ volume 90 ,\ pages 042303 ( year 2014 ) NoStop

    doi

  9. [17]

    Het\'enyi , author A

    author author B. Het\'enyi , author A. Mook , author J. Klinovaja ,\ and\ author D. Loss ,\ title title Long-distance coupling of spin qubits via topological magnons , \ https://doi.org/10.1103/PhysRevB.106.235409 journal journal Phys. Rev. B \ volume 106 ,\ pages 235409 ( yea...

    doi

  10. [18]

    author author B. M. \ Terhal , author J. Conrad ,\ and\ author C. Vuillot ,\ title title Towards scalable bosonic quantum error correction , \ https://doi.org/10.1088/2058-9565/ab98a5 journal journal Quantum Science and Technology \ volume 5 ,\ pages 043001 ( year 2020 ) NoStop

    doi

  11. [19]

    Bejarano , author F

    author author M. Bejarano , author F. J. T. \ Goncalves , author T. Hache , author M. Hollenbach , author C. Heins , author T. Hula , author L. Körber , author J. Heinze , author Y. Berencén , author M. Helm , author J. Fassbender , author G. V. \ Astakhov ,\ and\ author H. Sc...

    doi

  12. [20]

    author author D. F. \ Walls ,\ title title Squeezed states of light , \ https://doi.org/10.1038/306141a0 journal journal Nature \ volume 306 ,\ pages 141--146 ( year 1983 ) NoStop

    1983 doi

  13. [21]

    author author R. E. \ Slusher , author L. W. \ Hollberg , author B. Yurke , author J. C. \ Mertz ,\ and\ author J. F. \ Valley ,\ title title Observation of squeezed states generated by four-wave mixing in an optical cavity , \ https://doi.org/10.1103/PhysRevLett.55.2409 journ...

    doi

  14. [22]

    \ Wu , author H

    author author L.-A. \ Wu , author H. J. \ Kimble , author J. L. \ Hall ,\ and\ author H. Wu ,\ title title Generation of squeezed states by parametric down conversion , \ https://doi.org/10.1103/PhysRevLett.57.2520 journal journal Phys. Rev. Lett. \ volume 57 ,\ pages 2520--25...

    doi

  15. [23]

    author author T. L. S. \ Collaboration ,\ title title A gravitational wave observatory operating beyond the quantum shot-noise limit , \ https://doi.org/10.1038/nphys2083 journal journal Nature Physics \ volume 7 ,\ pages 962--965 ( year 2011 ) NoStop

    doi

  16. [24]

    author author T. L. S. \ Collaboration ,\ title title Enhanced sensitivity of the ligo gravitational wave detector by using squeezed states of light , \ https://doi.org/10.1038/nphoton.2013.177 journal journal Nature Photonics \ volume 7 ,\ pages 613--619 ( year 2013 ) NoStop

    2013 doi

  17. [25]

    Li , author S.-Y

    author author J. Li , author S.-Y. \ Zhu ,\ and\ author G. S. \ Agarwal ,\ title title Squeezed states of magnons and phonons in cavity magnomechanics , \ https://doi.org/10.1103/PhysRevA.99.021801 journal journal Phys. Rev. A \ volume 99 ,\ pages 021801 ( year 2019 ) NoStop

    doi

  18. [26]

    Hioki , author K

    author author T. Hioki , author K. Tojo , author M. Elyasi , author S. Horibe , author H. Shimizu , author K. Hoshi , author T. Makiuchi , author G. E. W. \ Bauer ,\ and\ author E. Saitoh ,\ title title Single- and two-mode magnon thermal squeezing , \ https://doi.org/10.1038/...

    doi

  19. [27]

    Guo , author J

    author author Q. Guo , author J. Cheng , author H. Tan ,\ and\ author J. Li ,\ title title Magnon squeezing by two-tone driving of a qubit in cavity-magnon-qubit systems , \ https://doi.org/10.1103/PhysRevA.108.063703 journal journal Phys. Rev. A \ volume 108 ,\ pages 063703 (...

    doi

  20. [28]

    Kamra \ and\ author W

    author author A. Kamra \ and\ author W. Belzig ,\ title title Magnon-mediated spin current noise in ferromagnet | nonmagnetic conductor hybrids , \ https://doi.org/10.1103/PhysRevB.94.014419 journal journal Phys. Rev. B \ volume 94 ,\ pages 014419 ( year 2016 b ) NoStop

    doi

  21. [29]

    Kamra , author W

    author author A. Kamra , author W. Belzig ,\ and\ author A. Brataas ,\ title title Magnon-squeezing as a niche of quantum magnonics , \ https://doi.org/10.1063/5.0021099 journal journal Applied Physics Letters \ volume 117 ,\ pages 090501 ( year 2020 ) NoStop

    doi

  22. [30]

    author author A.-L. E. \ R\"omling , author A. Vivas-Via\ na , author C. S. \ Mu\ noz ,\ and\ author A. Kamra ,\ title title Resolving nonclassical magnon composition of a magnetic ground state via a qubit , \ https://doi.org/10.1103/PhysRevLett.131.143602 journal journal Phys...

    doi

  23. [31]

    Zou , author S

    author author J. Zou , author S. K. \ Kim ,\ and\ author Y. Tserkovnyak ,\ title title Tuning entanglement by squeezing magnons in anisotropic magnets , \ https://doi.org/10.1103/PhysRevB.101.014416 journal journal Phys. Rev. B \ volume 101 ,\ pages 014416 ( year 2020 ) NoStop

    doi

  24. [32]

    Elyasi , author Y

    author author M. Elyasi , author Y. M. \ Blanter ,\ and\ author G. E. W. \ Bauer ,\ title title Resources of nonlinear cavity magnonics for quantum information , \ https://doi.org/10.1103/PhysRevB.101.054402 journal journal Phys. Rev. B \ volume 101 ,\ pages 054402 ( year 2020...

    doi

  25. [33]

    author author C. L. \ Degen , author F. Reinhard ,\ and\ author P. Cappellaro ,\ title title Quantum sensing , \ https://doi.org/10.1103/RevModPhys.89.035002 journal journal Rev. Mod. Phys. \ volume 89 ,\ pages 035002 ( year 2017 ) NoStop

    doi

  26. [34]

    author author P. S. \ Patel \ and\ author D. B. \ Desai ,\ title title Review of qubit-based quantum sensing , \ https://doi.org/10.1007/s11128-025-04699-5 journal journal Quantum Information Processing \ volume 24 ,\ pages 83 ( year 2025 ) NoStop

    doi

  27. [35]

    Fink , author C

    author author C. Fink , author C. Salemi , author B. Young , author D. Schuster ,\ and\ author N. Kurinsky ,\ title title Superconducting quasiparticle-amplifying transmon: A qubit-based sensor for mev-scale phonons and single terahertz photons , \ https://doi.org/10.1103/Phys...

    doi

  28. [36]

    Kakuyanagi , author H

    author author K. Kakuyanagi , author H. Toida , author L. V. \ Abdurakhimov ,\ and\ author S. Saito ,\ title title Submicrometer‑scale temperature sensing using quantum coherence of a superconducting qubit , \ https://doi.org/10.1088/1367-2630/acb379 journal journal New Journa...

    doi

  29. [37]

    Danilin \ and\ author M

    author author S. Danilin \ and\ author M. Weides ,\ https://arxiv.org/abs/2103.11022 title Quantum sensing with superconducting circuits , \ howpublished arXiv preprint arXiv:2103.11022 ( year 2021 ) NoStop

    2021 arXiv

  30. [38]

    Casola , author T

    author author F. Casola , author T. van der Sar ,\ and\ author A. Yacoby ,\ title title Probing condensed matter physics with magnetometry based on nitrogen-vacancy centres in diamond , \ https://doi.org/10.1038/natrevmats.2017.88 journal journal Nature Reviews Materials \ vol...

    doi

  31. [39]

    Xu , author W

    author author Y. Xu , author W. Zhang ,\ and\ author C. Tian ,\ title title Recent advances on applications of nv centers; magnetometry in condensed matter physics , \ https://doi.org/10.1364/PRJ.471266 journal journal Photon. Res. \ volume 11 ,\ pages 393--412 ( year 2023 ) NoStop

    doi

  32. [40]

    author author B. G. \ Simon , author S. Kurdi , author J. J. \ Carmiggelt , author M. Borst , author A. J. \ Katan ,\ and\ author T. van der Sar ,\ title title Filtering and imaging of frequency-degenerate spin waves using nanopositioning of a single-spin sensor , \ https://do...

    doi

  33. [41]

    van der Sar , author F

    author author T. van der Sar , author F. Casola , author R. Walsworth ,\ and\ author A. Yacoby ,\ title title Nanometre-scale probing of spin waves using single electron spins , \ https://doi.org/10.1038/ncomms8886 journal journal Nature Communications \ volume 6 ,\ pages 7886...

    doi

  34. [42]

    author author M. R. \ Page , author B. A. \ McCullian , author C. M. \ Purser , author J. G. \ Schulze , author T. M. \ Nakatani , author C. S. \ Wolfe , author J. R. \ Childress , author M. E. \ McConney , author B. M. \ Howe , author P. C. \ Hammel ,\ and\ author V. P. \ Bha...

    doi

  35. [43]

    author author P. E. \ Dolgirev , author S. Chatterjee , author I. Esterlis , author A. A. \ Zibrov , author M. D. \ Lukin , author N. Y. \ Yao ,\ and\ author E. Demler ,\ title title Characterizing two-dimensional superconductivity via nanoscale noise magnetometry with single-...

    doi

  36. [44]

    Chatterjee , author P

    author author S. Chatterjee , author P. E. \ Dolgirev , author I. Esterlis , author A. A. \ Zibrov , author M. D. \ Lukin , author N. Y. \ Yao ,\ and\ author E. Demler ,\ title title Single-spin qubit magnetic spectroscopy of two-dimensional superconductivity , \ https://doi.o...

    doi

  37. [45]

    Bhattacharyya , author W

    author author P. Bhattacharyya , author W. Chen , author X. Huang , author S. Chatterjee , author B. Huang , author B. Kobrin , author Y. Lyu , author T. J. \ Smart , author M. Block , author E. Wang , author Z. Wang , author W. Wu , author S. Hsieh , author H. Ma , author S. ...

  38. [46]

    author author A. L. \ Melendez , author S. Das , author F. A. \ Rodriguez , author I.-H. \ Kao , author W. Liu , author A. J. \ Williams , author B. Lv , author J. Goldberger , author S. Chatterjee , author S. Singh ,\ and\ author P. C. \ Hammel ,\ title title Quantum sensing ...

    doi

  39. [47]

    Machado , author E

    author author F. Machado , author E. A. \ Demler , author N. Y. \ Yao ,\ and\ author S. Chatterjee ,\ title title Quantum noise spectroscopy of dynamical critical phenomena , \ https://doi.org/10.1103/PhysRevLett.131.070801 journal journal Phys. Rev. Lett. \ volume 131 ,\ page...

    doi

  40. [48]

    author author D. I. \ Schuster , author A. A. \ Houck , author J. A. \ Schreier , author A. Wallraff , author J. M. \ Gambetta , author A. Blais , author L. Frunzio , author J. Majer , author B. Johnson , author M. H. \ Devoret , author S. M. \ Girvin ,\ and\ author R. J. \ Sc...

    doi

  41. [49]

    Arrangoiz-Arriola , author E

    author author P. Arrangoiz-Arriola , author E. A. \ Wollack , author Z. Wang , author M. Pechal , author W. Jiang , author T. P. \ McKenna , author J. D. \ Witmer , author R. Van Laer ,\ and\ author A. H. \ Safavi-Naeini ,\ title title Resolving the energy levels of a nanomech...

    doi

  42. [50]

    author author J. G. \ Peixoto de Faria \ and\ author M. C. \ Nemes ,\ title title Dissipative dynamics of the jaynes-cummings model in the dispersive approximation: Analytical results , \ https://doi.org/10.1103/PhysRevA.59.3918 journal journal Phys. Rev. A \ volume 59 ,\ page...

    doi

  43. [51]

    Gambetta , author A

    author author J. Gambetta , author A. Blais , author D. I. \ Schuster , author A. Wallraff , author L. Frunzio , author J. Majer , author M. H. \ Devoret , author S. M. \ Girvin ,\ and\ author R. J. \ Schoelkopf ,\ title title Qubit-photon interactions in a cavity: Measurement...

    doi

  44. [53]

    Kamra , author E

    author author A. Kamra , author E. Thingstad , author G. Rastelli , author R. A. \ Duine , author A. Brataas , author W. Belzig ,\ and\ author A. Sudb ,\ title title Antiferromagnetic magnons as highly squeezed fock states underlying quantum correlations , \ https://doi.org/10...

    doi

  45. [54]

    Savary \ and\ author L

    author author L. Savary \ and\ author L. Balents ,\ title title Quantum spin liquids: a review , \ https://doi.org/10.1088/0034-4885/80/1/016502 journal journal Reports on Progress in Physics \ volume 80 ,\ pages 016502 ( year 2016 ) NoStop

    doi

  46. [55]

    Zhou , author K

    author author Y. Zhou , author K. Kanoda ,\ and\ author T.-K. \ Ng ,\ title title Quantum spin liquid states , \ https://doi.org/10.1103/RevModPhys.89.025003 journal journal Rev. Mod. Phys. \ volume 89 ,\ pages 025003 ( year 2017 ) NoStop

    doi

  47. [56]

    Broholm , author R

    author author C. Broholm , author R. J. \ Cava , author S. A. \ Kivelson , author D. G. \ Nocera , author M. R. \ Norman ,\ and\ author T. Senthil ,\ title title Quantum spin liquids , \ https://doi.org/10.1126/science.aay0668 journal journal Science \ volume 367 ,\ pages eaay...

    doi

  48. [57]

    author author A.-L. E. \ R\"omling \ and\ author A. Kamra ,\ title title Quantum sensing of antiferromagnetic magnon two-mode squeezed vacuum , \ https://doi.org/10.1103/PhysRevB.109.174410 journal journal Phys. Rev. B \ volume 109 ,\ pages 174410 ( year 2024 ) NoStop

    doi

  49. [58]

    author author A.-L. E. \ R\"omling , author J. Feist , author F. J. \ Garc\' a-Vidal ,\ and\ author A. Kamra ,\ title title Squeezing and quantum control of the antiferromagnetic magnon pseudospin , \ https://doi.org/10.1103/qjm2-d19g journal journal Phys. Rev. B \ volume 112 ...

    doi

  50. [59]

    author author I. C. \ Skogvoll , author J. Lidal , author J. Danon ,\ and\ author A. Kamra ,\ title title Tunable anisotropic quantum rabi model via a magnon--spin-qubit ensemble , \ https://doi.org/10.1103/PhysRevApplied.16.064008 journal journal Phys. Rev. Appl. \ volume 16 ...

    doi

  51. [60]

    Kittel ,\ @noop title Introduction to Solid State Physics \ ( publisher John Wiley & Sons ,\ address New York ,\ year 1953 ) NoStop

    author author C. Kittel ,\ @noop title Introduction to Solid State Physics \ ( publisher John Wiley & Sons ,\ address New York ,\ year 1953 ) NoStop

    1953

  52. [61]

    author author M. V. \ Satyanarayana ,\ title title Generalized coherent states and generalized squeezed coherent states , \ https://doi.org/10.1103/PhysRevD.32.400 journal journal Phys. Rev. D \ volume 32 ,\ pages 400--404 ( year 1985 ) NoStop

    doi

  53. [62]

    author author M. S. \ Kim , author F. A. M. \ de Oliveira ,\ and\ author P. L. \ Knight ,\ title title Properties of squeezed number states and squeezed thermal states , \ https://doi.org/10.1103/PhysRevA.40.2494 journal journal Phys. Rev. A \ volume 40 ,\ pages 2494--2503 ( y...

    doi

  54. [63]

    author author D. F. \ Walls \ and\ author G. J. \ Milburn ,\ https://doi.org/10.1007/978-3-031-84177-4 title Quantum Optics ,\ edition 3rd \ ed.,\ Graduate Texts in Physics\ ( publisher Springer ,\ address Cham ,\ year 2025 ) NoStop

    2025 doi

  55. [64]

    \ Breuer \ and\ author F

    author author H.-P. \ Breuer \ and\ author F. Petruccione ,\ title title The theory of open quantum systems , \ https://doi.org/10.1093/acprof:oso/9780199213900.001.0001 journal journal Oxford Academic \ ( year 2010 ) NoStop

    2010

  56. [65]

    Xu , author X.-K

    author author D. Xu , author X.-K. \ Gu , author H.-K. \ Li , author Y.-C. \ Weng , author Y.-P. \ Wang , author J. Li , author H. Wang , author S.-Y. \ Zhu ,\ and\ author J. Q. \ You ,\ title title Quantum control of a single magnon in a macroscopic spin system , \ https://do...

    doi

  57. [66]

    Dey , author S

    author author B. Dey , author S. Verma , author M. Weiler ,\ and\ author A. Kamra ,\ https://doi.org/https://doi.org/10.48550/arXiv.2507.19066 title Sensing magnonic quantum superpositions using a bosonic mode as the probe , \ https://arxiv.org/abs/arXiv.2507.19066 arXiv.2507....

    doi arXiv

  58. [67]

    Moussa et al., Lindblad description of dispersively coupled quantum systems, (unpublished)

    @noop note T. Moussa et al., Lindblad description of dispersively coupled quantum systems, (unpublished). Stop

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