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REVIEW 5 major objections 5 minor 52 references

High-resolution spectroscopy of 162Dy Rydberg levels

T0 review · 5 major / 5 minor · reviewed 2026-08-02 · deepseek-v4-flash

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Pith's one-line read The first high-resolution Rydberg survey of 162Dy maps over 700 states and sharpens the ionization potential by an order of magnitude.

desk verdict First high-resolution Dy Rydberg map with a plausible but not bulletproof absolute EIP; worth refereeing. read the letter →

arxiv 2602.19824 v1 pith:6OJJ55FM submitted 2026-02-23 physics.atom-ph cond-mat.quant-gasquant-ph

G. Ferioli , P. Lombardi , P. Sekhar , E. Sole Cardona , N. Preti , C. Drevon , N. Antolini , L. Tanzi
show 4 more authors
G. Modugno C. Gabbanini F. Robicheaux A. Fioretti
This is my paper · ORCID
classification physics.atom-phcond-mat.quant-gasquant-ph
keywords Rydbergspectroscopydysprosium-162ionizationpotentialmultichannelquantumdefecttheorytrapdepletiondefectslanthanideatomsseries
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

The paper reports the first high-resolution, absolute-frequency survey of Rydberg states in 162Dy, using two-color trap-depletion spectroscopy in a magneto-optical trap. More than 700 states with effective principal quantum numbers n = 21 to 130 are measured with 20 MHz accuracy, and eight Rydberg series are identified. The first ionization potential is determined as 47901.8265 ± 0.0008 cm−1, an order-of-magnitude precision gain over the previous value. A multichannel quantum defect theory model reproduces the line positions and characterizes six perturbing states from higher ionization limits. If correct, these results give experimentalists a reliable map for building Rydberg-based quantum devices with dysprosium and a benchmark for open-shell atomic theory.

What carries the argument

The central object is the Rydberg-Ritz formula E_n = E_IP − R_162/(n−δ(n))^2, which links each measured line to a quantum defect δ. The assignment machinery is multichannel quantum defect theory: a real symmetric K-matrix with energy-dependent diagonal quantum defects and pole-like perturber terms, whose eigenvalues satisfy det[K(ϵ)+tan(πν(ϵ))I]=0. The fits use 8 channels grouped by total angular momentum J=8,9,10, plus 6 perturbers, to reproduce roughly 620 assigned line positions and fix the series quantum defects and perturber couplings. A frame-transformation approximation for the ns manifold reduces four K-matrix elements to two triplet/singlet phase shifts, providing a consistency chec

What would settle it

Measure a single Dy Rydberg transition with an independent absolute frequency reference, for example an optical frequency comb locked to a primary standard, at a state near n=90, and compare it with the table value; a deviation beyond 20 MHz would invalidate the calibration assumption. Alternatively, if residual electric fields were significant, re-fitting the ionization potential using only low-n states would yield a value statistically different from the full-fit result.

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Extended reading notes

Core claim

The central claim is the first high-resolution Rydberg spectrum of 162Dy, obtained by monitoring magneto-optical-trap fluorescence loss as a probe laser drives atoms from the MOT excited state to Rydberg levels. The authors measure absolute excitation frequencies of over 700 states with 20 MHz accuracy, assign most to eight series converging to the 4f10(5I8)6s(2S1/2) J=17/2 ionization limit, and extract the ionization potential E_IP = 47901.8265 ± 0.0008 cm−1. Using an MQDT K-matrix fit, they identify and characterize six perturbing states, including a positive-energy J=9 state interpreted as a bound level attached to the second excited ionic threshold. The work is positioned as the spectros

Load-bearing premise

The quoted 20 MHz absolute accuracy relies on the wavemeter calibration against a strontium reference remaining valid across the entire scan and on unmodeled AC-Stark or stray-electric-field shifts being negligible for all included states; a common-mode frequency error would shift every level and the extracted ionization potential without increasing the fit chi-squared.

Editorial extensions

If this is right

  • The 20 MHz absolute scale for more than 700 Rydberg states provides a direct frequency reference for future dysprosium quantum experiments, including Rydberg gates and dressing schemes.
  • The sharper ionization potential, E_IP = 47901.8265(8) cm−1, tightens the energy reference for all subsequent Rydberg and photoionization work in 162Dy.
  • The classification into eight series and the characterization of six perturbers offer benchmark data for multichannel quantum defect calculations in open-shell lanthanides.
  • The observed depletion-signal modulation near a perturber shows that trap-depletion amplitudes can qualitatively track perturber-enhanced coupling, giving an intensity-based probe of channel mixing.
  • The level assignments and quantum-defect tables enable direct planning of Rydberg excitation paths without re-deriving the spectrum from scratch.

Reading between the lines

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

  • If an independent absolute frequency reference, such as an optical frequency comb, were used to verify a single Rydberg transition, the 20 MHz accuracy claim could be confirmed; any deviation would point to a common-mode calibration offset that the current chi-squared analysis would not detect.
  • The success of the frame-transformation approximation for the ns series suggests that a similar recoupling analysis applied to the nd manifold might reduce the number of free parameters in future MQDT fits, provided higher-resolution data covering all relevant channels become available.
  • The identification of a bound J=9 perturber lying above the first ionization threshold implies that Rydberg excitation near threshold may encounter field-sensitive or autoionizing states; electric-field-dependent studies could probe this region directly.
  • Because the paper deliberately excludes the highest-n data due to stray-field sensitivity, a controlled study with electric-field shielding could extend the Rydberg map beyond n=130 and test whether the perturbation structure follows the predicted scaling.
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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

5 major / 5 minor

Summary. The manuscript reports a two-color trap-depletion spectroscopic survey of Rydberg states in 162Dy, detecting over 700 lines with a claimed absolute frequency accuracy of 20 MHz. Using a Rydberg-Ritz fit of a selected J=8 ns series, the authors determine the first ionization potential as EIP = 47901.8265 ± 0.0008 cm−1, which improves the literature precision by more than an order of magnitude. Most lines are assigned to eight Rydberg series, and a simplified MQDT model with perturbing channels is used to refine assignments, locate six perturbers, and assess line amplitudes. The paper presents a large, novel dataset and a plausible assignment framework.

Significance. If the absolute accuracy claim is upheld, the work is the first high-resolution Rydberg survey of dysprosium, providing a resource for Rydberg-based quantum architectures and a benchmark for open-shell atomic theory. The compiled 700-level dataset and the improved EIP value are potentially significant. The MQDT analysis, despite residual scatter, is a useful assignment and perturbation tool. The main scientific value depends on the credibility of the 20 MHz absolute accuracy and the robustness of the EIP uncertainty, which are the load-bearing claims.

major comments (5)
  1. [Sec. II, footnote [41]; Sec. III A] The 20 MHz absolute accuracy is assembled from stochastic terms and MOT drift, but no account is given for wavelength-dependent calibration errors of the wavemeter when transferring the Sr calibration to the 414–419 nm probe range. A scale error would produce a common-mode shift of all Rydberg energies and of EIP that is invisible to the χ²(EIP) curvature quoted in Sec. III A. Please provide a direct calibration-transfer test (e.g., known transitions across the scanned range) or otherwise bound the wavelength-dependent systematic uncertainty.
  2. [Sec. III A] The EIP fit excludes high-n data because of possible stray-field shifts, but no quantitative bound is given for the included states. Stray-field shifts grow steeply with n; even a small residual field at the highest included n would bias the fitted EIP. Please estimate the maximum residual electric field (e.g., from MOT ions, patch potentials, electrode geometry) and propagate its effect on the included n range into the EIP uncertainty.
  3. [Sec. IV] The MQDT fits claim standard deviations of approximately 150, 110, and 70 MHz for J=8, 9, and 10, respectively, which are 3–7 times larger than the stated 20 MHz line accuracy. The text attributes this to simplified modeling. While acceptable for assignment purposes, this means the MQDT cannot independently validate the absolute frequency scale. Please state explicitly at the introduction of the MQDT results that the model does not test the 20 MHz accuracy, and separate assignment confidence from absolute-energy validation.
  4. [Sec. IV B; Appendix A] The frame-transformation check fits two free parameters to four MQDT-derived K-matrix elements; the agreement in Table III is a consistency test of the J assignment but does not independently confirm EIP or the absolute scale. Additionally, Appendix A shows that sign degeneracies of the Viα lead to parameter variations beyond the listed widths; the quoted parameter uncertainties in Tables I and II should be presented as conditional on the chosen sign convention, or the sign ambiguity should be propagated.
  5. [Sec. III A] The text states that the new EIP is 'slightly outside the error bar' of the previous determination [34] without giving the literature value or the difference. Quantifying this offset is directly relevant to the common-mode calibration concern and to evaluating whether the improved precision is internally consistent. Please specify the literature EIP and its uncertainty, and discuss the offset explicitly.
minor comments (5)
  1. [Abstract vs. Sec. VI] The abstract reports 'over 700 states' while the conclusion says 'more than 600 levels (over roughly 700 detected ones)'. Please reconcile the wording.
  2. [Sec. III A] The number of J=8 ns lines used in the EIP fit and the precise selection criteria (beyond the stated exclusions) should be given, since the fit's χ² and residuals depend on this subset.
  3. [Sec. III] The definition of n = floor(n*) + 1 and δ(n) = Mod[-n*,1] could be clarified by explicitly stating the branch of the modulo function used, as this affects the plotted quantum defects.
  4. [Throughout] The isotope symbol is written as '162Dy' in several places; use the standard superscript form '¹⁶²Dy' in the published version.
  5. [Sec. IV B] In Eq. (9), the notation K(8)_{15/2,17/2} and the calculation of the off-diagonal element would benefit from an explicit statement of which V and which derivative are used, as the sign convention is not transparent.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: EIP is an empirical fit to measured line positions; MQDT is fitted with EIP fixed and is not used to claim independent confirmation of the threshold; the frame-transformation check is an explicit 2-parameter consistency test rather than a parameter-free prediction.

full rationale

The paper's derivation chain is self-contained and not circular. The central EIP value is obtained from a conventional least-squares Rydberg–Ritz fit to measured Rydberg-line energies (Eqs. 1–2, Sec. III A); the fitted threshold is the target quantity, not an input that has been renamed as an output. The quoted uncertainty of 0.0008 cm−1 is derived from the curvature of χ²(EIP), a standard statistical procedure. The MQDT analysis (Sec. IV) explicitly fixes the threshold to the EIP value from Eq. (3) before fitting K-matrix parameters, so it is used to refine assignments and characterize perturbers, not to independently verify the threshold. The frame-transformation check (Sec. IV B) fits two unknown phase shifts to four MQDT-derived K-matrix elements; the text describes this as a comparison and the table shows only partial agreement, so it is an internal consistency test rather than a disguised prediction. No load-bearing claim depends on a self-citation: Ref. [33] serves only as a comparison point for Er, Ref. [34] sets the initial scan range, and Ref. [45] is the standard MQDT reference. The skeptical concerns about wavemeter calibration transfer and stray-field offsets are systematic-uncertainty/correctness risks, not circularity: they affect the absolute accuracy of the measurement but do not make any derived result equivalent to its inputs by construction.

Assumptions & free parameters 6 free parameters · 8 assumptions · 1 invented entities

The central result is a fit-heavy experimental survey. The headline EIP is itself a fit parameter, and the MQDT interpretation adds dozens of additional fitted channel and perturber parameters. The only fully external anchors are the Rydberg constant and literature core-state energies; the accuracy claim additionally depends on unquantified field-shift assumptions.

free parameters (6)
  • Ionization potential EIP = 47901.8265(8) cm−1
    Scanned and minimized in Rydberg-Ritz fit to selected J=8 ns levels (Sec. III A); it is the paper's headline result, not an independent input.
  • Quantum defect coefficients δ0, δ2 for EIP-fit ns series = δ0=0.3514(2), δ2=-27.4(3)
    Fit parameters in Eq. (2) for the selected J=8 ns series; used simultaneously with EIP.
  • MQDT channel quantum defects δ0,i, δ2,i (8 series) = Table I: 16 values, e.g. J=8 δ0=0.34710(17), δ2=-7.73(12)
    Fit to line positions with threshold fixed to EIP (Sec. IV A).
  • MQDT perturber energies Eα and couplings Vi,α = Table II: 6 energies and 17 couplings, e.g. J=8 -143.696(30) cm−1, V1=2.7674(86) cm−1/2
    Parameters of the K-matrix pole model, Eq. (6), fit to all assigned line positions.
  • Frame-transformation K-matrix elements K3S, K1S = K3S=3.259, K1S=1.154
    Obtained by χ² minimization against four MQDT-derived K-matrix elements (Sec. IV B); an internal consistency check.
  • Depletion-signal Lorentzian parameters α, ε0, Γ = ε0=-21.4(2) cm−1, Γ=2.8(6) cm−1
    Fit of Eq. (10) to J=10 depletion amplitudes (Sec. V), used only qualitatively.
assumptions (8)
  • domain assumption Rydberg-Ritz formula, Eq. (1): E_n = E_IP - R162/(n−δ(n))^2
    Standard single-channel Rydberg-series energy relation used for all n* and EIP extraction.
  • domain assumption Truncated quantum-defect expansion, Eq. (2): δ(n)=δ0+δ2/(n−δ0)^2+...
    Assumed valid for the selected J=8 ns series over the fit range; the paper notes δ2 from the fit differs from MQDT, so the model is known to be incomplete.
  • standard math MQDT bound-state condition, Eq. (5): det[K(ε)+tan πν(ε) I]=0
    Standard multichannel quantum defect theory relation used in Sec. IV.
  • domain assumption Pole approximation of K-matrix, Eq. (6), with isolated perturbers
    Assumes isolated, energy-separated perturbers; derived in App. B with ν_p≪ν_r. The paper acknowledges oversimplified modeling (large χ²).
  • domain assumption Frame-transformation angular recoupling, App. C Eqs. (C1)-(C4)
    Assumes LS coupling at short range and J-j coupling at long range for the two ns series and ns perturber.
  • domain assumption Absolute frequency calibration via wavemeter against Sr reference
    The 20 MHz accuracy of every level depends on this calibration transfer (footnote [41]).
  • ad hoc to paper No unmodeled AC-Stark or stray-electric-field shifts above 20 MHz for included states
    The paper excludes high-n data due to residual electric fields (Sec. III A) but gives no quantitative bound for the included points; if this fails, all absolute energies and EIP shift.
  • domain assumption Core energies of Dy+ excited states from Ref. [44]: 828.314 cm−1 and 4341.104 cm−1
    Used in Eq. (4) and for the assignment of the +9.95 cm−1 perturber (Secs. III B, IV A).
invented entities (1)
  • J=9 perturber at +9.95 cm−1 assigned to a 4f10(5I7)6s(2S1/2) 6I15/2 nd state with n*≈5.034
    purpose: Explains the exceptionally strong coupling of the J=9 MQDT fit
    No direct observation; the n*≈5.034 state lies far below the surveyed range, and this assignment is introduced because the nominal ns interpretation is forbidden by angular momentum. Stated as 'leads us to interpret' in Sec. IV A.

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Pith. "Pith review of High-resolution spectroscopy of 162Dy Rydberg levels." pith.science (2026). https://pith.science/paper/6OJJ55FM

@misc{pith2026260219824,
  author       = {Pith},
  title        = {Pith review of: High-resolution spectroscopy of 162Dy Rydberg levels},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/6OJJ55FM}},
  note         = {Machine review of arXiv:2602.19824}
}
read the original abstract

Highly excited Rydberg states of lanthanides are a promising, yet largely unexplored, playground for quantum studies. Here, we report on the first high-resolution spectroscopy of 162Dy obtained by two-color trap depletion spectroscopy in a magneto-optical trap. The absolute excitation frequency of over 700 states with effective principal quantum number n between 21 and 130 is measured with an accuracy of 20 MHz. Most states are assigned to the 8 different series converging to the first 4f10(5I8)6s(2S1/2) J = 17/2 ionization potential. This energy is measured at EIP = 47901.8265 +/- 0.0008 cm-1, improving the precision of the literature value by over an order of magnitude. A multichannel quantum defect theory approach is used to benchmark and refine the assignments and to characterize six observed perturbing states belonging to higher ionization limits. These results pave the way for using dysprosium in Rydberg-based quantum architectures, leveraging the unique properties arising from its complex electronic structure. They also represent a compelling benchmark for ab-initio calculations of open-shell atomic systems.

Figures

Figures reproduced from arXiv: 2602.19824 by the authors.

Figure 1
Figure 1. FIG. 1. (a) Two-photon excitation scheme to the Rydberg levels. The first photon, nearly resonant with the intermediate [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. FIG. 2. (a) Measured energies of all observed Rydberg lev [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. FIG. 3. Quantum defects of assigned Rydberg levels, divided in series for different values of J. Red points correspond to J=8, [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figures from the paper (2 more)
Figure 4
Figure 4. Figure 4: FIG. 4. Panels (a), (b), and (c) show the results of MQDT [PITH_FULL_IMAGE:figures/full_fig_p006_4.png]
Figure 5
Figure 5. Figure 5: FIG. 5. In (a) quantum defects of all the 8 observed Rydberg [PITH_FULL_IMAGE:figures/full_fig_p008_5.png]

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Reference graph

Works this paper leans on

52 extracted references · 1 canonical work pages

  1. [41]

    The first and second terms are stochastic and independent errors, and com- bine into an overall contribution of around 10 MHz

    The absolute uncertainty characterizing the determina- tion of the Rydberg levels is given by the wavemeter precision, the uncertainty with which we can locate the depletion peak, and the possible drift of the MOT laser during the spectroscopy campaign. The first and second terms are stochastic and independent errors, and com- bine into an overall contrib...

  2. [34]

    Trautmann, M

    A. Trautmann, M. J. Mark, P. Ilzh¨ ofer, H. Edri, A. E. Ar- rach, J. G. Maloberti, C. H. Greene, F. Robicheaux, and F. Ferlaino, Spectroscopy of Rydberg states in erbium us- ing electromagnetically induced transparency, Phys. Rev. Res.3, 033165 (2021)

    2021

  3. [1]

    C. S. Adams, J. D. Pritchard, and J. P. Shaffer, Ry- dberg atom quantum technologies, Journal of Physics B: Atomic, Molecular and Optical Physics53, 012002 (2019)

    2019

  4. [2]

    Saffman, T

    M. Saffman, T. G. Walker, and K. Mølmer, Quantum information with Rydberg atoms, Rev. Mod. Phys.82, 2313 (2010)

    2010

  5. [3]

    Browaeys and T

    A. Browaeys and T. Lahaye, Many-body physics with individually controlled Rydberg atoms, Nature Physics 16, 132 (2020)

    2020

  6. [4]

    M. A. Norcia, A. W. Young, W. J. Eckner, E. Oelker, J. Ye, and A. M. Kaufman, Seconds- scale coherence on an optical clock transition in a tweezer array, Science366, 93 (2019), https://www.science.org/doi/pdf/10.1126/science.aay0644

    doi:10.1126/science.aay0644 2019

  7. [5]

    I. S. Madjarov, A. Cooper, A. L. Shaw, J. P. Covey, V. Schkolnik, T. H. Yoon, J. R. Williams, and M. Endres, An atomic-array optical clock with single-atom readout, Phys. Rev. X9, 041052 (2019)

    2019

  8. [6]

    Firstenberg, C

    O. Firstenberg, C. S. Adams, and S. Hofferberth, Non- linear quantum optics mediated by Rydberg interactions, Journal of Physics B: Atomic, Molecular and Optical Physics49, 152003 (2016)

    2016

Show all 52 references
  1. [7]

    Kumlin, C

    J. Kumlin, C. Braun, C. Tresp, N. Stiesdal, S. Hoffer- berth, and A. Paris-Mandoki, Quantum optics with Ry- dberg superatoms, Journal of Physics Communications 7, 052001 (2023)

    2023

  2. [8]

    Cooper, J

    A. Cooper, J. P. Covey, I. S. Madjarov, S. G. Porsev, M. S. Safronova, and M. Endres, Alkaline-earth atoms in optical tweezers, Phys. Rev. X8, 041055 (2018). 11

    2018

  3. [9]

    Thend series converging to the same threshold can have either (17/2nd 3/2)or(17/2nd 5/2), both allowing J= 8,9,10 states. This leads to eight expected Rydberg series (twons and sixnd orbital angular momentum, or threeJ= 8, threeJ= 9 and twoJ= 10 total angu- lar momentum), in a...

  4. [10]

    Saskin, J

    S. Saskin, J. T. Wilson, B. Grinkemeyer, and J. D. Thompson, Narrow-line cooling and imaging of ytter- bium atoms in an optical tweezer array, Phys. Rev. Lett. 122, 143002 (2019)

    2019

  5. [11]

    J. P. Covey, I. S. Madjarov, A. Cooper, and M. En- dres, 2000-times repeated imaging of strontium atoms in clock-magic tweezer arrays, Phys. Rev. Lett.122, 173201 (2019)

    2000

  6. [12]

    Jenkins, J

    A. Jenkins, J. W. Lis, A. Senoo, W. F. McGrew, and A. M. Kaufman, Ytterbium nuclear-spin qubits in an op- tical tweezer array, Phys. Rev. X12, 021027 (2022)

    2022

  7. [13]

    J. T. Wilson, S. Saskin, Y. Meng, S. Ma, R. Dilip, A. P. Burgers, and J. D. Thompson, Trapping alkaline earth Rydberg atoms optical tweezer arrays, Phys. Rev. Lett. 128, 033201 (2022)

    2022

  8. [14]

    Y. Wu, S. Kolkowitz, S. Puri, and J. D. Thompson, Era- sure conversion for fault-tolerant quantum computing in alkaline earth Rydberg atom arrays, Nature communica- tions13, 4657 (2022)

    2022

  9. [15]

    J. W. Lis, A. Senoo, W. F. McGrew, F. R¨ onchen, A. Jenkins, and A. M. Kaufman, Midcircuit operations using the omg architecture in neutral atom arrays, Phys. Rev. X13, 041035 (2023)

    2023

  10. [16]

    S. Ma, G. Liu, P. Peng, B. Zhang, S. Jandura, J. Claes, A. P. Burgers, G. Pupillo, S. Puri, and J. D. Thompson, High-fidelity gates and mid-circuit erasure conversion in an atomic qubit, Nature622, 279 (2023)

    2023

  11. [17]

    Peper, Y

    M. Peper, Y. Li, D. Y. Knapp, M. Bileska, S. Ma, G. Liu, P. Peng, B. Zhang, S. P. Horvath, A. P. Burgers, and J. D. Thompson, Spectroscopy and modeling of 171Yb Rydberg states for high-fidelity two-qubit gates, Phys. Rev. X15, 011009 (2025)

    2025

  12. [18]

    R. B.-S. Tsai, X. Sun, A. L. Shaw, R. Finkelstein, and M. Endres, Benchmarking and fidelity response theory of high-fidelity Rydberg entangling gates, PRX Quantum6, 010331 (2025)

    2025

  13. [19]

    Senoo, A

    A. Senoo, A. Baumg¨ artner, J. W. Lis, G. M. Vaidya, Z. Zeng, G. Giudici, H. Pichler, and A. M. Kauf- man, High-fidelity entanglement and coherent multi- qubit mapping in an atom array (2025), arXiv:2506.13632 [quant-ph]

    2025

  14. [20]

    Bloch, B

    D. Bloch, B. Hofer, S. R. Cohen, A. Browaeys, and I. Ferrier-Barbut, Trapping and imaging single dyspro- sium atoms in optical tweezer arrays, Phys. Rev. Lett. 131, 203401 (2023)

    2023

  15. [21]

    D. S. Gr¨ un, S. J. M. White, A. Ortu, A. Di Carli, H. Edri, M. Lepers, M. J. Mark, and F. Ferlaino, Optical tweezer arrays of erbium atoms, Phys. Rev. Lett.133, 223402 (2024)

    2024

  16. [22]

    D. S. Gr¨ un, L. B. Giacomelli, A. Tashchilina, R. Donofrio, F. Borchers, T. Bland, M. J. Mark, and F. Ferlaino, Light-assisted collisions in tweezer-trapped lanthanides (2025), arXiv:2506.05123 [physics.atom-ph]

    2025 arXiv

  17. [23]

    L. Su, A. Douglas, M. Szurek, A. H. H´ ebert, A. Krahn, R. Groth, G. A. Phelps, O. Markovi´ c, and M. Greiner, Fast single atom imaging for optical lattice arrays, Nature Communications16, 1017 (2025)

    2025

  18. [24]

    Biagioni, B

    G. Biagioni, B. Hofer, N. Bonvalet, D. Bloch, A. Browaeys, and I. Ferrier-Barbut, Narrowline cooling of dysprosium atoms in an optical tweezer array, Phys. Rev. A112, 013316 (2025)

    2025

  19. [25]

    Patscheider, B

    A. Patscheider, B. Yang, G. Natale, D. Petter, L. Chomaz, M. J. Mark, G. Hovhannesyan, M. Lepers, and F. Ferlaino, Observation of a narrow inner-shell or- bital transition in atomic erbium at 1299 nm, Phys. Rev. Res.3, 033256 (2021)

    2021

  20. [26]

    Petersen, M

    N. Petersen, M. Tr¨ umper, and P. Windpassinger, Spec- troscopy of the 1001-nm transition in atomic dysprosium, Phys. Rev. A101, 042502 (2020)

    2020

  21. [27]

    E. O. Kiktenko, A. S. Nikolaeva, P. Xu, G. V. Shlyap- nikov, and A. K. Fedorov, Scalable quantum computing with qudits on a graph, Phys. Rev. A101, 022304 (2020)

    2020

  22. [28]

    Gonz´ alez-Cuadra, T

    D. Gonz´ alez-Cuadra, T. V. Zache, J. Carrasco, B. Kraus, and P. Zoller, Hardware efficient quantum simulation of non-abelian gauge theories with qudits on Rydberg plat- forms, Phys. Rev. Lett.129, 160501 (2022)

    2022

  23. [29]

    Saffman and K

    M. Saffman and K. Mølmer, Scaling the neutral-atom Rydberg gate quantum computer by collective encoding in holmium atoms, Phys. Rev. A78, 012336 (2008)

    2008

  24. [30]

    Kruckenhauser, M

    A. Kruckenhauser, M. Yuan, H. Zheng, M. Mamaev, P. Zeng, X. Mao, Q. Xu, T. V. Zache, L. Jiang, R. van Bi- jnen, and P. Zoller, Dark spin-cat states as biased qubits, Phys. Rev. Lett.135, 020601 (2025)

    2025

  25. [31]

    L. Du, P. Barral, M. Cantara, J. de Hond, Y.- K. Lu, and W. Ketterle, Atomic physics on a 50-nm scale: Realization of a bilayer sys- tem of dipolar atoms, Science384, 546 (2024), https://www.science.org/doi/pdf/10.1126/science.adh3023

    2024 doi

  26. [32]

    A. L. Shaw, P. Scholl, R. Finkelstein, R. B.- S. Tsai, J. Choi, and M. Endres, Erasure cool- ing, control, and hyperentanglement of motion in optical tweezers, Science388, 845 (2025), https://www.science.org/doi/pdf/10.1126/science.adn2618

    2025 doi

  27. [33]

    Gonz´ alez-Cuadra, D

    D. Gonz´ alez-Cuadra, D. Bluvstein, M. Kalinowski, R. Kaubruegger, N. Maskara, P. Naldesi, T. V. Zache, A. M. Kaufman, M. D. Lukin, H. Pichler, B. Vermersch, J. Ye, and P. Zoller, Fermionic quantum processing with programmable neutral atom arrays, Proceedings of the National A...

    2023 doi

  28. [35]

    Studer, P

    D. Studer, P. Dyrauf, P. Naubereit, R. Heinke, and K. Wendt, Resonance ionization spectroscopy in dysprosium: excitation scheme development and re- determination of the first ionization potential, Hyperfine Interactions238, 8 (2017)

    2017

  29. [36]

    Optimal operation of the system is thus obtained for slightly dif- ferent frequencies of the two lasers

    The 3D magneto-optical trap is loaded by a slow atomic beam outsourced from a 2D MOT that provides also the vertical beams of the 3D MOT, while the horizon- tal beams are provided by an independent laser. Optimal operation of the system is thus obtained for slightly dif- feren...

  30. [37]

    S. H. Youn, M. Lu, U. Ray, and B. L. Lev, Dysprosium magneto-optical traps, Phys. Rev. A82, 043425 (2010)

    2010

  31. [38]

    DLC TA-SHG PRO, softly focused to 1 mm waist and nearly 280 mW power on the atoms

    Toptica, mod. DLC TA-SHG PRO, softly focused to 1 mm waist and nearly 280 mW power on the atoms

  32. [39]

    Hostetter, J

    J. Hostetter, J. D. Pritchard, J. E. Lawler, and M. Saffman, Measurement of holmium Rydberg series through magneto-optical trap depletion spectroscopy, Phys. Rev. A91, 012507 (2015)

    2015

  33. [40]

    Couturier, I

    L. Couturier, I. Nosske, F. Hu, C. Tan, C. Qiao, Y. H. Jiang, P. Chen, and M. Weidem¨ uller, Measurement of the strontium triplet rydberg series by depletion spec- troscopy of ultracold atoms, Phys. Rev. A99, 022503 12 (2019)

    2019

  34. [42]

    Data are available from authors upon reasonable request

  35. [43]

    U. Fano, C. E. Theodosiou, and J. L. Dehmer, Electron- optical properties of atomic fields, Rev. Mod. Phys.48, 49 (1976)

    1976

  36. [44]

    Nave and U

    G. Nave and U. Griesmann, New energy levels and classi- fications of spectral lines from neutral and singly-ionized dysprosium (Dy I and Dy II), Physica Scripta62, 463 (2000)

    2000

  37. [45]

    Aymar, C

    M. Aymar, C. H. Greene, and E. Luc-Koenig, Multichan- nel Rydberg spectroscopy of complex atoms, Rev. Mod. Phys.68, 1015 (1996)

    1996

  38. [46]

    The first is that there are many lines below−85 cm −1 which could not be definitively classified but belong to eitherJ= 9 or J= 10

    There are two aspects of particular difficulty. The first is that there are many lines below−85 cm −1 which could not be definitively classified but belong to eitherJ= 9 or J= 10. Below this energy, there is a near degeneracy of one of the quantum defects ofJ= 9 with that ofJ=...

  39. [47]

    J. O. Day, E. Brekke, and T. G. Walker, Dynamics of low-density ultracold Rydberg gases, Phys. Rev. A77, 052712 (2008)

    2008

  40. [48]

    S. K. Dutta, D. Feldbaum, A. Walz-Flannigan, J. R. Guest, and G. Raithel, High-angular-momentum states in cold Rydberg gases, Phys. Rev. Lett.86, 3993 (2001)

    2001

  41. [49]

    [47] for the Rb case

    The excitation from ground-state to a Rydberg level may results in trap-loss due to a combination of effects, as discussed in ref. [47] for the Rb case. An atom excited to a Rydberg level can exit the cooling/trapping cycle because it can, with some probability, decay back int...

  42. [50]

    K.-L. Pham, T. F. Gallagher, P. Pillet, S. Lepoutre, and P. Cheinet, Coherent light shift on alkaline-earth Ryd- berg atoms from isolated core excitation without autoion- ization, PRX Quantum3, 020327 (2022)

    2022

  43. [51]

    Ravon, P

    B. Ravon, P. M´ ehaignerie, Y. Machu, A. D. Hern´ andez, M. Favier, J. M. Raimond, M. Brune, and C. Sayrin, Array of individual circular Rydberg atoms trapped in optical tweezers, Phys. Rev. Lett.131, 093401 (2023)

    2023

  44. [52]

    Camus, T

    P. Camus, T. F. Gallagher, J.-M. Lecomte, P. Pillet, L. Pruvost, and J. Boulmer, Observation of an electronic correlation for double-Rydberg states of barium, Phys. Rev. Lett.62, 2365 (1989)

    1989

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