Cited by 306Quantum Computing Algorithms and ArchitectureQuantum Information and CryptographyQuantum many-body systems

Realization of Real-Time Fault-Tolerant Quantum Error Correction

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Ryan-Anderson, C., Bohnet, J. G., Lee, K., Gresh, D., Hankin, A., Gaebler, J. P., Francois, D., Chernoguzov, A. +9 more·2021·Physical Review X

Abstract

Correcting errors in real time is essential for reliable large-scale quantum computations. Realizing this high-level function requires a system capable of several low-level primitives, including single-qubit and two-qubit operations, midcircuit measurements of subsets of qubits, real-time processing of measurement outcomes, and the ability to condition subsequent gate operations on those measurements. In this work, we use a 10-qubit quantum charge-coupled device trapped-ion quantum computer to encode a single logical qubit using the [[7,1,3]] color code, first proposed by Steane [Phys. Rev. Lett. 77, 793 (1996)PRLTAO0031-900710.1103/PhysRevLett.77.793]. The logical qubit is initialized into the eigenstates of three mutually unbiased bases using an encoding circuit, and we measure an average logical state preparation and measurement (SPAM) error of 1.7(2)×10^{-3}, compared to the average physical SPAM error 2.4(4)×10^{-3} of our qubits. We then perform multiple syndrome measurements on the encoded qubit, using a real-time decoder to determine any necessary corrections that are done either as software updates to the Pauli frame or as physically applied gates. Moreover, these procedures are done repeatedly while maintaining coherence, demonstrating a dynamically protected logical qubit memory. Additionally, we demonstrate non-Clifford qubit operations by encoding a T[over ¯]|+⟩_{L} magic state with an error rate below the threshold required for magic state distillation. Finally, we present system-level simulations that allow us to identify key hardware upgrades that may enable the system to reach the pseudothreshold.

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Crossref · 10.1103/physrevx.11.041058

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  • No quantum processor has definitively shown below-threshold performance.

    “Although many platforms have demonstrated different features of quantum error correction14–20, no quantum processor has definitively shown below-threshold performance.”

    From Quantum error correction below the surface code threshold (2025) · cites this paper as [14]

  • One primary path to scaling trapped-ion quantum computers is the quantum charge-coupled device (QCCD) architecture, which involves arrays of trapping zones between which ions are shuttled during algorithms.

    “One of the primary paths to scaling is the quantum charge-coupled device (QCCD) architecture, which involves arrays of trapping zones between which ions are shuttled during algorithms13–16.”

    From Penning micro-trap for quantum computing (2024) · cites this paper as [16]

  • The time to rearrange ions for arbitrary circuit connectivity scales poorly for the linear trap design as the number of qubits increases, proportional to N.

    “The time to rearrange ions for arbitrary circuit connectivity scales poorly for the linear trap design as the number of qubits increases (proportional to N [16]).”

    From A Race-Track Trapped-Ion Quantum Processor (2023) · cites this paper as [16]

  • Error suppression by increasing the colour code size had not been demonstrated on any experimental platform.

    “As a result, error suppression by increasing the colour code size has not yet been demonstrated, to our knowledge, on any experimental platform.”
  • The Steane code has been implemented with trapped ions and neutral atoms, demonstrating logical operations and logical circuits.

    “The smallest instance of the colour code, the Steane code37, has been implemented with trapped ions11,12 and neutral atoms18, demonstrating logical operations and logical circuits13–19.”

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Authors
Ryan-Anderson, C., Bohnet, J. G., Lee, K., Gresh, D., Hankin, A., Gaebler, J. P., Francois, D., Chernoguzov, A., Lucchetti, D., Brown, N. C., Gatterman, T. M., Halit, S. K., Gilmore, K., Gerber, J. A., Neyenhuis, B., Hayes, D., & Stutz, R. P.
Affiliations
Quantinuum (United States) (US)
Venue
Physical Review X
Published
2021-12-23
Volume
11
Issue
4
ISSN
2160-3308 (ISSN-L)
OpenAlex
W3181660950
Cited by
306
References
96
Citations by year
2026: 37 · 2025: 79 · 2024: 77 · 2023: 60 · 2022: 51 · 2021: 2
FWCI
16.72
Type
journal article
Language
en
Open access
Locations
  • Physical Review X (publishedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Computing Algorithms and Architecture
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum many-body systems
Keywords
quantum error correction, real-time decoding, fault tolerance, color codes, trapped-ion quantum computer, quantum charge-coupled device, logical qubits, syndrome measurement, non-Clifford gates, magic state distillation

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