arxiv: 2604.16292 · v1 · submitted 2026-04-17 · 🪐 quant-ph

Recognition: unknown

Fast, High-Fidelity Erasure Detection of Dual-Rail Qubits with Symmetrically Coupled Readout

Jimmy Shih-Chun Hung , Arbel Haim , Mouktik Raha , Gihwan Kim , Ziwen Huang , Ming-Han Chou , Mitch D'Ewart , Erik Davis

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Anurag Mishra Patricio Arrangoiz Arriola Amirhossein Khalajhedayati David Hover Fernando G.S.L. Brand\~ao Aashish A. Clerk Alex Retzker Harry Levine Oskar Painter

Authors on Pith no claims yet

Pith reviewed 2026-05-10 08:30 UTC · model grok-4.3

classification 🪐 quant-ph

keywords erasureerrordetectiondual-railtimesreadoutcheckcorrection

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The pith

Symmetrically coupled dispersive readout achieves 384 ns single-shot erasure detection on dual-rail qubits with 6.0(2)×10^{-4} residual error per check and enables parallel erasure checks during single-qubit gates with median 7.2×10^{-5} error per gate.

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

Dual-rail qubits encode information in the presence or absence of an excitation across two transmons, making them naturally good at flagging erasure errors where the qubit loses its state. The work uses one shared readout resonator that couples equally to both transmons. This symmetric coupling lets the resonator sense when an erasure has occurred without disturbing the logical states much. They perform the check in 384 nanoseconds and measure a small leftover error of about 0.0006 per check, plus very little extra dephasing. They also run the readout continuously while applying gates and still keep gate errors low. The matched coupling strength is key because it keeps the two logical states looking identical to the resonator, so the check does not leak information about the qubit state itself.

Core claim

We realize erasure detection with a hardware-efficient circuit consisting of a single readout resonator dispersively and symmetrically coupled to both transmons of a dual-rail qubit... achieving a residual error per check of 6.0(2) × 10^{-4}, with only 8(3) × 10^{-5} induced dephasing per check, and an erasure error per check of 2.54(1)×10^{-2}. ... median 7.2 × 10^{-5} error per gate with < 1 × 10^{-5} error induced by erasure detection.

Load-bearing premise

The assumption that the dispersive couplings χ to the two transmons can be matched closely enough inside the dual-rail code space that the resonator does not distinguish the logical states and therefore adds negligible dephasing or leakage during the check or during concurrent gates.

Figures

Figures reproduced from arXiv: 2604.16292 by Aashish A. Clerk, Alex Retzker, Amirhossein Khalajhedayati, Anurag Mishra, Arbel Haim, David Hover, Erik Davis, Fernando G.S.L. Brand\~ao, Gihwan Kim, Harry Levine, Jimmy Shih-Chun Hung, Ming-Han Chou, Mitch D'Ewart, Mouktik Raha, Oskar Painter, Patricio Arrangoiz Arriola, Ziwen Huang.

**Figure 2.** Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗

**Figure 3.** Figure 3: FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗

**Figure 4.** Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗

**Figure 5.** Figure 5: FIG. 5 [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗

**Figure 6.** Figure 6: (c), (d)). The dispersive shift χDR can be nonlinear with respect to nr,DR [13] which is more apparent near χmatched point. As such, we fit ∆DR(nr,DR) to a degree2 polynomial 2χDRnr,DR + 2χ ′ DRn 2 r,DR and report the linear coefficient χDR which is most relevant to the smallnumber-of-photon regime of our calibrated readout where nr,DR ∼ 1. At the near χ-matched point at 4.5 GHz, we find χDR/2π = −0.7(5… view at source ↗

**Figure 7.** Figure 7: FIG. 7 [PITH_FULL_IMAGE:figures/full_fig_p013_7.png] view at source ↗

**Figure 9.** Figure 9: FIG. 9 [PITH_FULL_IMAGE:figures/full_fig_p014_9.png] view at source ↗

read the original abstract

Erasure qubits are a promising platform for implementing hardware-efficient quantum error correction. Realizing the error-correction advantages of this encoding requires frequent mid-circuit erasure checks that are fast, high-fidelity, and scalable. Here, we realize erasure detection with a hardware-efficient circuit consisting of a single readout resonator dispersively and symmetrically coupled to both transmons of a dual-rail qubit. We use this circuit to demonstrate single-shot erasure detection in 384 ns with minimal impact on the dual-rail logical manifold, achieving a residual error per check of $6.0(2) \times 10^{-4}$, with only $8(3) \times 10^{-5}$ induced dephasing per check, and an erasure error per check of $2.54(1)\times 10^{-2}$. The high degree of matched dispersive readout coupling ($\chi$-matching) within the dual-rail qubit code space also allows us to realize a new modality: time-continuous erasure detection performed in parallel with single-qubit gates. Here we achieve a median $7.2 \times 10^{-5}$ error per gate with $< 1 \times 10^{-5}$ error induced by erasure detection. This demonstrates a reduction in erasure detection overhead as well as a crucial ingredient for soft information quantum error correction. Together, these results establish symmetrically coupled dispersive readout as a fast, hardware-efficient, and scalable component for erasure-based quantum error correction using transmon dual-rail qubits.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

This paper gives a working single-resonator circuit for fast erasure checks on dual-rail qubits that runs in parallel with gates and keeps added error low.

read the letter

The main result is a hardware-efficient readout: one resonator dispersively coupled to both transmons in the dual-rail pair so that the logical states |01> and |10> produce almost the same shift. They report single-shot erasure detection in 384 ns with 6.0(2)×10^{-4} residual error, 8(3)×10^{-5} induced dephasing, and 2.54(1)×10^{-2} erasure error per check. The same matching lets them run continuous detection alongside single-qubit gates, holding the detection-induced error below 10^{-5} while the median gate error is 7.2×10^{-5}. That parallel mode is the clearest practical step forward, since it removes the usual time penalty for mid-circuit checks in erasure-based codes. The numbers come with uncertainties and the abstract is clear about what was measured, which is better than many device papers. The symmetric-coupling idea itself is straightforward and avoids extra resonators or complex filtering. The load-bearing piece is still the χ-matching inside the code space. The quoted dephasing is low, but the abstract does not show a direct bound on the residual |χ1 − χ2| or higher-order terms, nor does it detail how stable the match stays once drives are on. If the full paper has calibration traces and a check that the match survives the 384 ns pulse and concurrent gates, the claim holds; otherwise the performance could be partly tuned for this run. This is for groups working on transmon-based erasure qubits or hardware-efficient QEC. It has enough concrete experimental content and a clear path to lower overhead that it deserves a serious referee, even if the matching details will need scrutiny in review.

Referee Report

1 major / 1 minor

Summary. The manuscript demonstrates a hardware-efficient erasure detection protocol for dual-rail qubits that uses a single readout resonator dispersively and symmetrically coupled to both transmons. It reports single-shot erasure detection in 384 ns with residual error per check of 6.0(2)×10^{-4}, induced dephasing of 8(3)×10^{-5}, and erasure error of 2.54(1)×10^{-2}, plus a continuous-detection modality performed in parallel with single-qubit gates that yields median gate error 7.2×10^{-5} with <1×10^{-5} added by the check.

Significance. If the reported performance is confirmed, the work is significant for erasure-based quantum error correction. It supplies a concrete, low-overhead experimental implementation that reduces mid-circuit check cost and enables concurrent soft-information readout, both of which are recognized bottlenecks for scaling erasure codes on transmon hardware. The numerical benchmarks with uncertainties provide a clear reference point for the community.

major comments (1)

[Abstract and experimental results] The central performance claims (induced dephasing 8(3)×10^{-5} per check and <1×10^{-5} during concurrent gates) rest on the assumption that the dispersive couplings satisfy |χ₁ − χ₂| small enough that the resonator cannot distinguish the logical states |01⟩ and |10⟩ inside the dual-rail code space. The manuscript provides no direct measurement or bound on the residual detuning, no quantification of higher-order terms (χ^{(2)}, cross-Kerr), and no verification that the matching is preserved throughout the 384 ns pulse or under simultaneous single-qubit drives. This is load-bearing for the claim of negligible logical dephasing.

minor comments (1)

[Methods] Clarify in the methods how χ-matching was calibrated and whether it was achieved by design or post-selection; include the raw resonator spectroscopy data that bounds |χ₁ − χ₂|.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the positive assessment of the manuscript's significance for erasure-based quantum error correction and for the constructive major comment. We address the concern point by point below, providing the strongest honest defense based on the reported measurements while agreeing to strengthen the presentation where appropriate.

read point-by-point responses

Referee: [Abstract and experimental results] The central performance claims (induced dephasing 8(3)×10^{-5} per check and <1×10^{-5} during concurrent gates) rest on the assumption that the dispersive couplings satisfy |χ₁ − χ₂| small enough that the resonator cannot distinguish the logical states |01⟩ and |10⟩ inside the dual-rail code space. The manuscript provides no direct measurement or bound on the residual detuning, no quantification of higher-order terms (χ^{(2)}, cross-Kerr), and no verification that the matching is preserved throughout the 384 ns pulse or under simultaneous single-qubit drives. This is load-bearing for the claim of negligible logical dephasing.

Authors: The measured induced dephasing of 8(3)×10^{-5} per check directly bounds the effective mismatch |χ₁ − χ₂|, as any appreciable detuning would produce observable dephasing within the code space at a rate set by the difference in dispersive shifts; the reported value is therefore an experimental upper limit on the logical dephasing contribution. We agree that an explicit, independent bound obtained from separate measurements of χ₁ and χ₂ (and their difference) is not presented and would strengthen the manuscript. Higher-order terms (χ^{(2)}, cross-Kerr) are not quantified in the current text; given the short 384 ns readout duration and the low observed erasure error of 2.54(1)×10^{-2}, their contribution is expected to be subdominant, but we will add device-parameter estimates in revision. Preservation of matching throughout the pulse is supported by the overall single-shot fidelity, while the concurrent-gate experiment (median gate error 7.2×10^{-5} with <1×10^{-5} added by the check) directly verifies that the symmetry holds under simultaneous single-qubit drives. We will revise the manuscript to include these additional bounds and clarifications. revision: partial

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The central claims rest on the experimental realization of χ-matching and on standard dispersive readout physics; no new mathematical axioms or invented particles are introduced. The only free parameters are the measured error rates themselves, which are outputs rather than inputs to the claim.

pith-pipeline@v0.9.0 · 5659 in / 1336 out tokens · 31247 ms · 2026-05-10T08:30:28.707669+00:00 · methodology

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Works this paper leans on

51 extracted references · 12 canonical work pages · 1 internal anchor

[1]

Grassl, T

M. Grassl, T. Beth, and T. Pellizzari, Codes for the quantum erasure channel, Phys. Rev. A56, 33 (1997)

1997
[2]

S. D. Barrett and T. M. Stace, Fault tolerant quantum computation with very high threshold for loss errors, Phys. Rev. Lett.105, 200502 (2010)

2010
[3]

Y. Wu, S. Kolkowitz, S. Puri, and J. D. Thompson, Erasure conversion for fault-tolerant quantum computing in alkaline earth rydberg atom arrays, Nat. Commun.13, 4657 (2022)

2022
[4]

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
[5]

Scholl, A

P. Scholl, A. L. Shaw, R. B.-S. Tsai, R. Finkelstein, J. Choi, and M. Endres, Erasure conversion in a high- fidelity rydberg quantum simulator, Nature622, 273 (2023)

2023
[6]

Levine, A

H. Levine, A. Haim, J. S. C. Hung, N. Alidoust, M. Kalaee, L. DeLorenzo, E. A. Wollack, P. Arrangoiz- Arriola, A. Khalajhedayati, R. Sanil, H. Moradinejad, Y. Vaknin, A. Kubica, D. Hover, S. Aghaeimeibodi, J. A. Alcid, C. Baek, J. Barnett, K. Bawdekar, P. Bienias, H. A. Carson, C. Chen, L. Chen, H. Chinkezian, E. M. Chisholm, A. Clifford, R. Cosmic, N. Cr...

2024
[7]

W.Huang, X.Sun, J.Zhang, Z.Guo, P.Huang, Y.Liang, Y. Liu, D. Sun, Z. Wang, Y. Xiong, X. Yang, J. Zhang, L. Zhang, J. Chu, W. Guo, J. Jiang, S. Liu, J. Niu, J. Qiu, Z. Tao, Y. Zhou, X. Linpeng, Y. Zhong, and D. Yu, Logical multi-qubit entanglement with dual-rail superconducting qubits, Nat. Phys.22, 591 (2026)

2026
[8]

K. S. Chou, T. Shemma, H. McCarrick, T.-C. Chien, J. D. Teoh, P. Winkel, A. Anderson, J. Chen, J. C. Curtis, S. J. de Graaf, J. W. O. Garmon, B. Gudlewski, W. D. Kalfus, T. Keen, N. Khedkar, C. U. Lei, G. Liu, P. Lu, Y. Lu, A. Maiti, L. Mastalli-Kelly, N. Mehta, S. O. Mundhada, A. Narla, T. Noh, T. Tsunoda, S. H. Xue, J. O. Yuan, L. Frunzio, J. Aumentado,...

2024
[9]

Koottandavida, I

A. Koottandavida, I. Tsioutsios, A. Kargioti, C. R. Smith, V. R. Joshi, W. Dai, J. D. Teoh, J. C. Curtis, L. Frunzio, R. J. Schoelkopf, and M. H. Devoret, Erasure detection of a dual-rail qubit encoded in a double-post superconducting cavity, Phys. Rev. Lett.132, 180601 (2024)

2024
[10]

Mehta, J

N. Mehta, J. D. Teoh, T. Noh, A. Agrawal, A. Anderson, B. Birdsall, A. Brahmbhatt, W. Byrd, M. Cacioppo, A. Cabrera, L. Carroll, J. Chen, T.-C. Chien, R. Chamberlain, J. C. Curtis, D. Danso, S. R. Desigan, F. D’Acounto, B. H. Elfeky, S. M. Farzaneh, C. Foley, B. Gudlewski, H. Hastings, R. Johnson, N. Khedkar, T. Keen, A. Kumar, C. Kurter, K. Krawczuk, E. ...

work page arXiv 2025
[11]

C. Liu, Y. Li, J. Wang, Q. Guan, L. Jin, L. Ma, R. Hu, T. Wang, X. Zhu, H.-F. Yu, C. Deng, and X. Ma, Converting qubit relaxation into erasures with a single fluxonium (2026), arXiv:2601.11086 [quant-ph]

work page arXiv 2026
[12]

S. J. de Graaf, S. H. Xue, B. J. Chapman, J. D. Teoh, T. Tsunoda, P. Winkel, J. W. O. Garmon, K. M. Chang, L. Frunzio, S. Puri, and R. J. Schoelkopf, A mid- circuit erasure check on a dual-rail cavity qubit using the joint-photon number-splitting regime of circuit qed, npj Quantum Info.11, 1 (2025)

2025
[13]

Kubica, A

A. Kubica, A. Haim, Y. Vaknin, H. Levine, F. Brandão, and A. Retzker, Erasure qubits: Overcoming theT1 limit in superconducting circuits, Phys. Rev. X13, 041022 (2023)

2023
[14]

D. T. McClure, H. Paik, L. S. Bishop, M. Steffen, J. M. Chow, and J. M. Gambetta, Rapid driven reset of a qubit readout resonator, Phys. Rev. Appl.5, 011001 (2016)

2016
[15]

Jerger, F

M. Jerger, F. Motzoi, Y. Gao, C. Dickel, L. Buchmann, A. Bengtsson, G. Tancredi, C. W. Warren, J. Bylander, 16 D. DiVincenzo, R. Barends, and P. A. Bushev, Dispersive qubit readout with intrinsic resonator reset (2024), arXiv:2406.04891 [quant-ph]

work page arXiv 2024
[16]

Zhao, Z.-A

R.-Z. Zhao, Z.-A. Zhao, T.-L. Wang, P. Wang, S. Zhang, X.-Y. Yang, H.-F. Zhang, Z.-F. Li, Y. Wu, Z.-H. Fu, S.-R. Liu, P. Duan, and G.-P. Guo, Single-step phase-engineered pulse for active readout cavity reset in superconducting circuits (2025), arXiv:2512.08393 [quant-ph]

work page arXiv 2025
[17]

Raveendran, N

N. Raveendran, N. Rengaswamy, A. K. Pradhan, and B. Vasić, Soft syndrome decoding of quantum ldpc codes for joint correction of data and syndrome errors, in2022 IEEE International Conference on Quantum Computing and Engineering (QCE)(IEEE, 2022) pp. 275–281

2022
[18]

C. A. Pattison, M. E. Beverland, M. P. da Silva, and N. Delfosse, Improved quantum error correction using soft information (2021), arXiv:2107.13589 [quant-ph]

work page arXiv 2021
[19]

Magic state cultivation: growing T states as cheap as CNOT gates

C. Gidney, N. Shutty, and C. Jones, Magic state cultivation: growing t states as cheap as cnot gates (2024), arXiv:2409.17595 [quant-ph]

work page internal anchor Pith review arXiv 2024
[20]

Jacoby, Y

S. Jacoby, Y. Vaknin, A. Retzker, and A. L. Grimsmo, Magic state injection with erasure qubits, PRX Quantum 6, 040323 (2025)

2025
[21]

D. Sank, Z. Chen, M. Khezri, J. Kelly, R. Barends, B. Campbell, Y. Chen, B. Chiaro, A. Dunsworth, A. Fowler, E. Jeffrey, E. Lucero, A. Megrant, J. Mutus, M. Neeley, C. Neill, P. J. J. O’Malley, C. Quintana, P. Roushan, A. Vainsencher, T. White, J. Wenner, A. N. Korotkov, and J. M. Martinis, Measurement-induced state transitions in a superconducting qubit:...

2016
[22]

Khezri, A

M. Khezri, A. Opremcak, Z. Chen, K. C. Miao, M. McEwen, A. Bengtsson, T. White, O. Naaman, D. Sank, A. N. Korotkov, Y. Chen, and V. Smelyanskiy, Measurement-induced state transitions in a superconducting qubit: Within the rotating-wave approximation, Phys. Rev. Appl.20, 054008 (2023)

2023
[23]

M. F. Dumas, B. Groleau-Paré, A. McDonald, M. H. Muñoz Arias, C. Lledó, B. D’Anjou, and A. Blais, Measurement-induced transmon ionization, Phys. Rev. X14, 041023 (2024)

2024
[24]

W. Dai, S. Hazra, D. K. Weiss, P. D. Kurilovich, T. Connolly, H. K. Babla, S. Singh, V. R. Joshi, A. Z. Ding, P. D. Parakh, J. Venkatraman, X. Xiao, L. Frunzio, and M. H. Devoret, Characterization of drive-induced unwanted state transitions in superconducting circuits, Phys. Rev. X16, 011011 (2026)

2026
[25]

Magesan, J

E. Magesan, J. M. Gambetta, B. R. Johnson, C. A. Ryan, J. M. Chow, S. T. Merkel, M. P. da Silva, G. A. Keefe, M. B. Rothwell, T. A. Ohki, M. B. Ketchen, and M. Steffen, Efficient measurement of quantum gate error by interleaved randomized benchmarking, Phys. Rev. Lett.109, 080505 (2012)

2012
[26]

J. Wang, K. Peng, J. M. Knecht, G. D. Cunningham, A. E. Lombo, A. Yen, D. A. Zaidenberg, M. Gingras, B. M. Niedzielski, H. Stickler, K. Sliwa, K. Serniak, M. E. Schwartz, W. D. Oliver, and K. P. O’Brien, High-efficiency, low-loss floquet-mode traveling wave parametric amplifier (2025), arXiv:2503.11812 [quant- ph]

work page arXiv 2025
[27]

V. V. Sivak, A. Eickbusch, B. Royer, S. Singh, I. Tsioutsios, S. Ganjam, A. Miano, B. L. Brock, A. Z. Ding, L. Frunzio, S. M. Girvin, R. J. Schoelkopf, and M. H. Devoret, Real-time quantum error correction beyond break-even, Nature616, 50 (2023)

2023
[28]

Thorbeck, Z

T. Thorbeck, Z. Xiao, A. Kamal, and L. C. G. Govia, Readout-induced suppression and enhancement of superconducting qubit lifetimes, Phys. Rev. Lett.132, 090602 (2024)

2024
[29]

Vall´ es-Sanclemente, T

S. Vallés-Sanclemente, T. H. F. Vroomans, T. R. van Abswoude, F. Brulleman, T. Stavenga, S. L. M. van der Meer, Y. Xin, A. Lawrence, V. Singh, M. A. Rol, and L. DiCarlo, Optimizing the frequency positioning of tunable couplers in a circuit qed processor to mitigate spectator effects on quantum operations (2025), arXiv:2503.13225 [quant-ph]

work page arXiv 2025
[30]

Huang, J

Z. Huang, J. S.-C. Hung, M. Raha, M.-H. Chou, H. Levine, A. Retzker, C. T. Hann, D. Hover, F. G. S. L. Brandão, A. A. Clerk, A. Haim, and O. Painter, Readout-induced degradation of transmon lifetimes: interplay of tlss and qubit spectral reshaping (2026), arXiv:2603.13857 [quant-ph]

work page arXiv 2026
[31]

P. A. Spring, L. Milanovic, Y. Sunada, S. Wang, A. F. van Loo, S. Tamate, and Y. Nakamura, Fast multiplexedsuperconducting-qubitreadoutwithintrinsic purcell filtering using a multiconductor transmission line, PRX Quantum6, 020345 (2025)

2025
[32]

Beaulieu, J.-Z

G. Beaulieu, J.-Z. Chen, M. Scigliuzzo, O. Benhayoune- Khadraoui, A. A. Chapple, P. A. Spring, A. Blais, and P. Scarlino, Fast, high-fidelity transmon readout with intrinsicpurcellprotectionvianonperturbativecross-kerr coupling (2026), arXiv:2601.04975 [quant-ph]

work page arXiv 2026
[33]

S. Gu, Y. Vaknin, A. Retzker, and A. Kubica, Optimizing quantum error-correction protocols with erasure qubits, PRX Quantum6, 040354 (2025)

2025
[34]

Chang, S

K. Chang, S. Singh, J. Claes, K. Sahay, J. Teoh, and S. Puri, Surface code with imperfect erasure checks, PRX Quantum6, 040355 (2025)

2025
[35]

D. C. McKay, C. J. Wood, S. Sheldon, J. M. Chow, and J. M. Gambetta, Efficientzgates for quantum computing, Phys. Rev. A96, 022330 (2017)

2017
[36]

Gammelmark, B

S. Gammelmark, B. Julsgaard, and K. Mølmer, Past quantum states of a monitored system, Phys. Rev. Lett. 111, 160401 (2013)

2013
[37]

A. N. Korotkov, Selective quantum evolution of a qubit state due to continuous measurement, Phys. Rev. B63, 115403 (2001)

2001
[38]

Gambetta, W

J. Gambetta, W. A. Braff, A. Wallraff, S. M. Girvin, and R. J. Schoelkopf, Protocols for optimal readout of qubits using a continuous quantum nondemolition measurement, Phys. Rev. A76, 012325 (2007)

2007
[39]

L. A. Martinez, Y. J. Rosen, and J. L. DuBois, Improving qubit readout with hidden markov models, Phys. Rev. A 102, 062426 (2020)

2020
[40]

P. D. Kurilovich, T. Connolly, C. G. L. Bøttcher, D. K. Weiss, S. Hazra, V. R. Joshi, A. Z. Ding, H. Nho, S. Diamond, V. D. Kurilovich, W. Dai, V. Fatemi, L. Frunzio, L. I. Glazman, and M. H. Devoret, High- frequency readout free from transmon multi-excitation resonances (2025), arXiv:2501.09161 [quant-ph]

work page arXiv 2025
[41]

A. V. Dixit, Z. L. Parrott, D. Chunikhin, B. Hauer, T. F. Q. Larson, and J. D. Teufel, Millimeter wave readout of a superconducting qubit (2026), arXiv:2603.13837 [quant-ph]

work page arXiv 2026
[42]

M. P. Bland, F. Bahrami, J. G. C. Martinez, P. H. Prestegaard, B. M. Smitham, A. Joshi, E. Hedrick, S. Kumar, A. Yang, A. C. Pakpour-Tabrizi, A. Jindal, 17 R. D. Chang, G. Cheng, N. Yao, R. J. Cava, N. P. de Leon, and A. A. Houck, Millisecond lifetimes and coherence times in 2d transmon qubits, Nature647, 343 (2025)

2025
[43]

Swiadek, R

F. Swiadek, R. Shillito, P. Magnard, A. Remm, C. Hellings, N. Lacroix, Q. Ficheux, D. C. Zanuz, G. J. Norris, A. Blais, S. Krinner, and A. Wallraff, Enhancing dispersive readout of superconducting qubits through dynamic control of the dispersive shift: Experiment and theory, PRX Quantum5, 040326 (2024)

2024
[44]

C. C. Bultink, B. Tarasinski, N. Haandbæk, S. Poletto, N. Haider, D. J. Michalak, A. Bruno, and L. DiCarlo, General method for extracting the quantum efficiency of dispersive qubit readout in circuit qed, Appl. Phys. Lett. 112, 092601 (2018)

2018
[45]

E. A. Sete, J. M. Martinis, and A. N. Korotkov, Quantum theory of a bandpass purcell filter for qubit readout, Phys. Rev. A92, 012325 (2015)

2015
[46]

Gambetta, A

J. Gambetta, A. Blais, D. I. Schuster, A. Wallraff, L. Frunzio, J. Majer, M. H. Devoret, S. M. Girvin, and R. J. Schoelkopf, Qubit-photon interactions in a cavity: Measurement-induced dephasing and number splitting, Phys. Rev. A74, 042318 (2006)

2006
[47]

D. Sank, A. Opremcak, A. Bengtsson, M. Khezri, J. Chen, O. Naaman, and A. Korotkov, System characterization of dispersive readout in superconducting qubits, Phys. Rev. Appl.23, 024055 (2025)

2025
[48]

C. A. Ryan, B. R. Johnson, J. M. Gambetta, J. M. Chow, M. P. da Silva, O. E. Dial, and T. A. Ohki, Tomography via correlation of noisy measurement records, Phys. Rev. A91, 022118 (2015)

2015
[49]

Z. Wang, B. D’Anjou, P. Gigon, A. Blais, and M. S. Blok, Probing excited-state dynamics of transmon ionization, Phys. Rev. X , (2026)

2026
[50]

Lisenfeld, G

J. Lisenfeld, G. J. Grabovskij, C. Müller, J. H. Cole, G. Weiss, and A. V. Ustinov, Observation of directly interacting coherent two-level systems in an amorphous material, Nat. Commun.6, 6182 (2015)

2015
[51]

K. C. Miao, M. McEwen, J. Atalaya, D. Kafri, L. P. Pryadko, A. Bengtsson, A. Opremcak, K. J. Satzinger, Z. Chen, P. V. Klimov, C. Quintana, R. Acharya, K. Anderson, M. Ansmann, F. Arute, K. Arya, A. Asfaw, J. C. Bardin, A. Bourassa, J. Bovaird, L. Brill, B. B. Buckley, D. A. Buell, T. Burger, B. Burkett, N. Bushnell, J. Campero, B. Chiaro, R. Collins, P. ...

2023