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In situ midcircuit qubit measurement and reset in a single-species trapped-ion quantum computing system

Yichao Yu*, Keqin Yan, Debopriyo Biswas, Vivian Ni Zhang, Bahaa Harraz, Crystal Noel, Christopher Monroe, and Alexander Kozhanov

  • Duke Quantum Center, Department of Electrical and Computer Engineering and Department of Physics, Duke University, Durham, North Carolina 27708, USA

  • *Contact author: yichao.yu@duke.edu
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Phys. Rev. Research 7, 043355 – Published 31 December, 2025

DOI: https://doi.org/10.1103/qfvd-93lw

Abstract

We implement in situ midcircuit measurement and reset (MCMR) operations on a full-scale trapped-ion quantum computing system by using metastable qubit states in Yb+171 ions. We compare two methods for isolating data qubits from measured qubits: one shelves the data qubits into the metastable state and the other drives the measured qubit to the metastable state without disturbing the other qubits. We experimentally demonstrate both methods on a crystal of two Yb+171 ions using both the S1/2 ground-state hyperfine clock qubit and the S1/2−D3/2 optical qubit. These MCMR methods result in errors on the data qubit of about 2% without degrading the measurement fidelity. With straightforward reductions in laser noise, these errors can be suppressed to less than 0.1%. The demonstrated methods allow MCMR to be performed in a single-species ion chain without shuttling or additional qubit-addressing optics, greatly simplifying the system architecture and allowing straightforward integration with existing trapped-ion quantum computers.

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References (41)

  1. Y. Alexeev et al., Quantum computer systems for scientific discovery, PRX Quantum 2, 017001 (2021).
  2. E. Altman et al., Quantum simulators: Architectures and opportunities, PRX Quantum 2, 017003 (2021).
  3. D. Awschalom et al., Development of quantum interconnects (QuICs) for next-generation information technologies, PRX Quantum 2, 017002 (2021).
  4. J. Ye and P. Zoller, Quantum sensing with atomic, molecular, and optical platforms for fundamental physics, Phys. Rev. Lett. 132, 190001 (2024).
  5. F. A. An, A. Ransford, A. Schaffer, L. R. Sletten, J. Gaebler, J. Hostetter, and G. Vittorini, High fidelity state preparation and measurement of ion hyperfine qubits with I>1/2, Phys. Rev. Lett. 129, 130501 (2022).
  6. C. M. Löschnauer, J. M. Toba, A. C. Hughes, S. A. King, M. A. Weber, R. Srinivas, R. Matt, R. Nourshargh, D. T. C. Allcock, C. J. Ballance, C. Matthiesen, M. Malinowski, and T. P. Harty, Scalable, high-fidelity all-electronic control of trapped-ion qubits, PRX Quantum 6, 040313 (2025).
  7. D. Bluvstein et al., Logical quantum processor based on reconfigurable atom arrays, Nature (London) 626, 58 (2024).
  8. M. C. Smith, A. D. Leu, K. Miyanishi, M. F. Gely, and D. M. Lucas, Single-qubit gates with errors at the 10−7 level, Phys. Rev. Lett. 134, 230601 (2025).
  9. A. S. Sotirova, J. D. Leppard, A. Vazquez-Brennan, S. M. Decoppet, F. Pokorny, M. Malinowski, and C. J. Ballance, High-fidelity heralded quantum state preparation and measurement, arXiv:2409.05805.
  10. S. Majumder, L. Andreta de Castro, and K. R. Brown, Real-time calibration with spectator qubits, npj Quantum Inf. 6, 19 (2020).
  11. J. Roffe, Quantum error correction: an introductory guide, Contemp. Phys. 60, 226 (2019).
  12. P. O. Schmidt, T. Rosenband, C. Langer, W. M. Itano, J. C. Bergquist, and D. J. Wineland, Spectroscopy using quantum logic, Science 309, 749 (2005).
  13. V. Negnevitsky, M. Marinelli, K. K. Mehta, H.-Y. Lo, C. Flühmann, and J. P. Home, Repeated multi-qubit readout and feedback with a mixed-species trapped-ion register, Nature (London) 563, 527 (2018).
  14. J. M. Pino et al., Demonstration of the trapped-ion quantum CCD computer architecture, Nature (London) 592, 209 (2021).
  15. K. Singh, C. E. Bradley, S. Anand, V. Ramesh, R. White, and H. Bernien, Mid-circuit correction of correlated phase errors using an array of spectator qubits, Science 380, 1265 (2023).
  16. D. Zhu, G. D. Kahanamoku-Meyer, L. Lewis, C. Noel, O. Katz, B. Harraz, Q. Wang, A. Risinger, L. Feng, D. Biswas, L. Egan, A. Gheorghiu, Y. Nam, T. Vidick, U. Vazirani, N. Y. Yao, M. Cetina, and C. Monroe, Interactive cryptographic proofs of quantumness using mid-circuit measurements, Nat. Phys. 19, 1725 (2023).
  17. S. A. Moses et al., A race-track trapped-ion quantum processor, Phys. Rev. X 13, 041052 (2023).
  18. D. Bluvstein, H. Levine, G. Semeghini, T. T. Wang, S. Ebadi, M. Kalinowski, A. Keesling, N. Maskara, H. Pichler, M. Greiner, V. Vuletić, and M. D. Lukin, A quantum processor based on coherent transport of entangled atom arrays, Nature (London) 604, 451 (2022).
  19. S. Motlakunta, N. Kotibhaskar, C.-Y. Shih, A. Vogliano, D. McLaren, L. Hahn, J. Zhu, R. Hablützel, and R. Islam, Preserving a qubit during state-destroying operations on an adjacent qubit at a few micrometers distance, Nat. Commun. 15, 6575 (2024).
  20. D. T. C. Allcock, W. C. Campbell, J. Chiaverini, I. L. Chuang, E. R. Hudson, I. D. Moore, A. Ransford, C. Roman, J. M. Sage, and D. J. Wineland, omg blueprint for trapped ion quantum computing with metastable states, Appl. Phys. Lett. 119, 214002 (2021).
  21. J. W. Lis, A. Senoo, W. F. McGrew, F. Rönchen, A. Jenkins, and A. M. Kaufman, Midcircuit operations using the omg architecture in neutral atom arrays, Phys. Rev. X 13, 041035 (2023).
  22. 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, Nature (London) 622, 279 (2023).
  23. T. M. Graham, L. Phuttitarn, R. Chinnarasu, Y. Song, C. Poole, K. Jooya, J. Scott, A. Scott, P. Eichler, and M. Saffman, Midcircuit measurements on a single-species neutral alkali atom quantum processor, Phys. Rev. X 13, 041051 (2023).
  24. F. Lindenfelser, M. Marinelli, V. Negnevitsky, S. Ragg, and J. P. Home, Cooling atomic ions with visible and infra-red light, New J. Phys. 19, 063041 (2017).
  25. Z.-Y. Chen et al., Non-invasive mid-circuit measurement and reset on atomic qubits, arXiv:2504.12538.
  26. T. Manovitz, Y. Shapira, L. Gazit, N. Akerman, and R. Ozeri, Trapped-ion quantum computer with robust entangling gates and quantum coherent feedback, PRX Quantum 3, 010347 (2022).
  27. J. D. Leppard, A. S. Sotirova, A. Vazquez-Brennan, S. M. Decoppet, D. P. Nadlinger, F. Pokorny, and C. J. Ballance, Enabling coherent operations in large registers of trapped ions containing multiple qubit types, Bull. Am. Phys. Soc. (2024).
  28. M. A. Norcia et al., Midcircuit qubit measurement and rearrangement in a Yb171 atomic array, Phys. Rev. X 13, 041034 (2023).
  29. B. Hu, J. Sinclair, E. Bytyqi, M. Chong, A. Rudelis, J. Ramette, Z. Vendeiro, and V. Vuletić, Site-selective cavity readout and classical error correction of a 5-bit atomic register, Phys. Rev. Lett. 134, 120801 (2025).
  30. P. J. Low, B. White, and C. Senko, Control and readout of a 13-level trapped ion qudit, npj Quantum Inf. 11, 85 (2025).
  31. A. S. Nikolaeva, I. V. Zalivako, A. S. Borisenko, N. V. Semenin, K. P. Galstyan, A. E. Korolkov, E. O. Kiktenko, K. Y. Khabarova, I. A. Semerikov, A. K. Fedorov, and N. N. Kolachevsky, Scalable improvement of the generalized Toffoli gate realization using trapped-ion-based qutrits, Phys. Rev. Lett. 135, 060601 (2025).
  32. C. Monroe, D. M. Meekhof, B. E. King, W. M. Itano, and D. J. Wineland, Demonstration of a fundamental quantum logic gate, Phys. Rev. Lett. 75, 4714 (1995).
  33. A. Kozhanov, Y. Yu, L. Zhukas, L. Feng, D. Biswas, B. Harraz, K. Yan, V. Zhang, C. Noel, and C. Monroe, Next-generation trapped-ion quantum computing system, in Optica Quantum 2.0 Conference and Exhibition (2023) (Optica Publishing Group, Washington, DC, 2023), paper QM3A.2.
  34. M. C. Revelle, Phoenix and peregrine ion traps, arXiv:2009.02398.
  35. M. Cetina, L. Egan, C. Noel, M. Goldman, D. Biswas, A. Risinger, D. Zhu, and C. Monroe, Control of transverse motion for quantum gates on individually addressed atomic qubits, PRX Quantum 3, 010334 (2022).
  36. H. C. Nägerl, D. Leibfried, H. Rohde, G. Thalhammer, J. Eschner, F. Schmidt-Kaler, and R. Blatt, Laser addressing of individual ions in a linear ion trap, Phys. Rev. A 60, 145 (1999).
  37. R. B. Blackman and J. W. Tukey, The measurement of power spectra from the point of view of communications engineering — Part II, Bell Sys. Tech. J. 37, 485 (1958).
  38. K. N. Blodgett, D. Peana, S. S. Phatak, L. M. Terry, M. P. Montes, and J. D. Hood, Imaging a Li6 atom in an optical tweezer 2000 times with Λ-enhanced gray molasses, Phys. Rev. Lett. 131, 083001 (2023).
  39. M. F. Parsons, F. Huber, A. Mazurenko, C. S. Chiu, W. Setiawan, K. Wooley-Brown, S. Blatt, and M. Greiner, Site-resolved imaging of fermionic Li6 in an optical lattice, Phys. Rev. Lett. 114, 213002 (2015).
  40. A. Kramida and Y. Ralchenko, J. Reader, NIST ASD Team, NIST Atomic Spectra Database (version 5.12), National Institute of Standards and Technology, Gaithersburg, MD (2024), https://doi.org/10.18434/T4W30F.
  41. https://github.com/yuyichao/yyc-data/tree/0a2c95791bcf4c1c9a1706e30907809ed2b78d92/euriqa/experiments/raman_435_202410.

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Phys. Rev. Research 7, 043355– Published 31 December, 2025
  • Received 22 April 2025
  • Accepted 10 November 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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