Beating the break-even point with autonomous quantum error correction

• URL: http://arxiv.org/abs/2504.16746v1
• Date: Wed, 23 Apr 2025 14:16:41 GMT
• Title: Beating the break-even point with autonomous quantum error correction
• Authors: Yi Li, Qingyuan Mei, Qing-Xuan Jie, Weizhou Cai, Yue Li, Zhiyuan Liu, Zi-Jie Chen, Zihan Xie, Xu Cheng, Xingyu Zhao, Zhenghao Luo, Mengxiang Zhang, Xu-Bo Zou, Chang-Ling Zou, Yiheng Lin, Jiangfeng Du,
• Abstract summary: Quantum error correction (QEC) protects fragile quantum information from errors by encoding it in high-dimensional Hilbert spaces.<n>Here, we realize autonomous QEC with a logical qubit encoded in multiple internal spin states of a single trapped ion.<n>We extend the logical qubit lifetime to approximately 11.6 ms, substantially outperforming lifetime for both the physical qubit and the uncorrected logical qubit.
• Score: 23.98841239616206
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum error correction (QEC) is essential for practical quantum computing, as it protects fragile quantum information from errors by encoding it in high-dimensional Hilbert spaces. Conventional QEC protocols typically require repeated syndrome measurements, real-time feedback, and the use of multiple physical qubits for encoding. Such implementations pose significant technical complexities, particularly for trapped-ion systems, with high demands on precision and scalability. Here, we realize autonomous QEC with a logical qubit encoded in multiple internal spin states of a single trapped ion, surpassing the break-even point for qubit lifetime. Our approach leverages engineered spin-motion couplings to transfer error-induced entropy into motional modes, which are subsequently dissipated through sympathetic cooling with an ancilla ion, fully eliminating the need for measurement and feedback. By repetitively applying this autonomous QEC protocol under injected low-frequency noise, we extend the logical qubit lifetime to approximately 11.6 ms, substantially outperforming lifetime for both the physical qubit ($\simeq$0.9 ms) and the uncorrected logical qubit ($\simeq$0.8 ms), thereby beating the break-even point with autonomous protection of quantum information without measurement or post-selection. This work presents an efficient approach to fault-tolerant quantum computing that harnesses the intrinsic multi-level structure of trapped ions, providing a distinctive path toward scalable architectures and robust quantum memories with reduced overhead.

Related papers

• Assessing Teleportation of Logical Qubits in a Distributed Quantum Architecture under Error Correction [4.352368481242436]
  We show that logical qubits can be teleported between nodes with very low logical error rates, even with network noise in near-term regimes.<n>We use circuit-level simulations to assess physical and network noise regimes ranging from $10-1$ to $10-6$.
  arXiv  Detail & Related papers  (2025-04-08T01:56:19Z)
• Error correction of a logical qubit encoded in a single atomic ion [0.0]
  Quantum error correction (QEC) is essential for quantum computers to perform useful algorithms.<n>Recent work has proposed a complementary approach of performing error correction at the single-particle level.<n>Here we demonstrate QEC in a single atomic ion that decreases errors by a factor of up to 2.2 and extends the qubit's useful lifetime by a factor of up to 1.5.
  arXiv  Detail & Related papers  (2025-03-18T05:10:21Z)
• Error-mitigated Geometric Quantum Control over an Oscillator [2.7382619198694886]
  Quantum information is fragile to environmentally and operationally induced imperfections.<n>We propose a robust scheme based on quantum optimal control via functional theory.<n>Our scheme provides a promising alternative for fault-tolerant quantum computation.
  arXiv  Detail & Related papers  (2025-01-24T09:13:24Z)
• A Quantum-Classical Collaborative Training Architecture Based on Quantum State Fidelity [50.387179833629254]
  We introduce a collaborative classical-quantum architecture called co-TenQu. Co-TenQu enhances a classical deep neural network by up to 41.72% in a fair setting. It outperforms other quantum-based methods by up to 1.9 times and achieves similar accuracy while utilizing 70.59% fewer qubits.
  arXiv  Detail & Related papers  (2024-02-23T14:09:41Z)
• Near-Term Distributed Quantum Computation using Mean-Field Corrections and Auxiliary Qubits [77.04894470683776]
  We propose near-term distributed quantum computing that involve limited information transfer and conservative entanglement production. We build upon these concepts to produce an approximate circuit-cutting technique for the fragmented pre-training of variational quantum algorithms.
  arXiv  Detail & Related papers  (2023-09-11T18:00:00Z)
• Quantum process tomography of continuous-variable gates using coherent states [49.299443295581064]
  We demonstrate the use of coherent-state quantum process tomography (csQPT) for a bosonic-mode superconducting circuit. We show results for this method by characterizing a logical quantum gate constructed using displacement and SNAP operations on an encoded qubit.
  arXiv  Detail & Related papers  (2023-03-02T18:08:08Z)
• Deep Quantum Error Correction [73.54643419792453]
  Quantum error correction codes (QECC) are a key component for realizing the potential of quantum computing. In this work, we efficiently train novel emphend-to-end deep quantum error decoders. The proposed method demonstrates the power of neural decoders for QECC by achieving state-of-the-art accuracy.
  arXiv  Detail & Related papers  (2023-01-27T08:16:26Z)
• Beating the break-even point with a discrete-variable-encoded logical qubit [11.225411597366886]
  Quantum error correction (QEC) aims to protect logical qubits from noises by utilizing the redundancy of a large Hilbert space. In most QEC codes, a logical qubit is encoded in some discrete variables, e.g., photon numbers. Our work illustrates the potential of the hardware-efficient discrete-variable QEC codes towards a reliable quantum information processor.
  arXiv  Detail & Related papers  (2022-11-17T03:38:55Z)
• Interactive Protocols for Classically-Verifiable Quantum Advantage [46.093185827838035]
  "Interactions" between a prover and a verifier can bridge the gap between verifiability and implementation. We demonstrate the first implementation of an interactive quantum advantage protocol, using an ion trap quantum computer.
  arXiv  Detail & Related papers  (2021-12-09T19:00:00Z)
• Hardware-Efficient, Fault-Tolerant Quantum Computation with Rydberg Atoms [55.41644538483948]
  We provide the first complete characterization of sources of error in a neutral-atom quantum computer. We develop a novel and distinctly efficient method to address the most important errors associated with the decay of atomic qubits to states outside of the computational subspace. Our protocols can be implemented in the near-term using state-of-the-art neutral atom platforms with qubits encoded in both alkali and alkaline-earth atoms.
  arXiv  Detail & Related papers  (2021-05-27T23:29:53Z)
• Protecting a Bosonic Qubit with Autonomous Quantum Error Correction [2.1806044218454854]
  In principle, quantum error correction can be realized autonomously and continuously by tailoring dissipation within the quantum system. Here we encode a logical qubit in Schr"odinger cat-like multiphoton states of a superconducting cavity. This passive protocol realizes autonomous correction against single-photon loss and boosts the coherence time of the multiphoton qubit by over a factor of two.
  arXiv  Detail & Related papers  (2020-04-20T14:14:27Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.