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[论文解读] Steering paths mid-flight for fault-tolerance in measurement-based holonomic gates

Anirudh Lanka, Juan Garcia-Nila|arXiv (Cornell University)|Mar 3, 2026
Quantum Computing Algorithms and Architecture被引用 0
一句话总结

该论文提出一种基于测量的容错霍纳量子计算框架,利用带实时反馈的连续测量引导霍纳路径,通过量子Zeno效应抑制非马尔可夫噪声,并通过路径引导和纠错来纠正马尔可夫误差。

ABSTRACT

Continuous measurement-based holonomic quantum computation provides a route to universal logical computation in quantum error correcting codes. We introduce a fault-tolerant framework for implementing measurement-based holonomic gates that leverages continuous measurements with real-time feedback. We show that non-Markovian decoherence is intrinsically suppressed through the quantum Zeno effect, while Markovian errors are identified by the decoding of measurement records to reveal the rotated syndrome subspace populated during the evolution. This information enables steering holonomic paths mid-flight to ensure that the final evolution realizes the target logical gate. We further demonstrate that non-adiabatic effects give rise to measurement-induced errors, and we show that these can also be corrected by an analogous protocol. This approach relaxes the stringent adiabaticity requirement and enables faster implementation of holonomic gates.

研究动机与目标

  • 在稳定编码中基于霍纳方法实现通用容错量子计算的动机。
  • 建立一个框架,使连续测量将系统沿瞬时码空间驱动以实现逻辑门。
  • 展示测量记录的实时解码如何揭示旋转的综合征子空间以实现路径引导。
  • 证明非绝热、测量诱发误差可以被纠正,从而实现更快的门实现。

提出的方法

  • 将码空间的演化建模为复Grassmannian和Stiefel流形上的霍洛纳变换。
  • 定义水平提升条件,通过L(t)实现霍洛诺哈冑,其投影算子P(t)=L(t)L†(t)。
  • 使用旋转稳定化子的连续弱测量来约束动态并揭示旋转的综合征。
  • 引入引导协议,基于测量结果实时修改演化路径。
  • 推导在连续稳定子测量下的密度矩阵随机主方程,κ为测量速率。
  • 给出充分条件(定理1),在连续旋转期间 rotated codes 仍能纠正误差集E。
Figure 1: The horizontal lift as a unique curve in $S_{N,K}(\mathbb{C})$ with the base manifold $G_{N,K}(\mathbb{C})$ . The difference between the initial point $V(0)$ and the final point $V(T)$ is the holonomy.
Figure 1: The horizontal lift as a unique curve in $S_{N,K}(\mathbb{C})$ with the base manifold $G_{N,K}(\mathbb{C})$ . The difference between the initial point $V(0)$ and the final point $V(T)$ is the holonomy.

实验结果

研究问题

  • RQ1如何在稳定码中使基于测量的霍纳门具有容错性?
  • RQ2在执行霍纳门的同时,连续测量能否通过量子Zeno效应抑制非马尔可夫噪声?
  • RQ3如何对测量结果进行解码并用于引导演化轨迹,以在门过程中纠正马尔可夫误差?
  • RQ4在绝热/有限速率的霍纳旋转中, rotated codes 在哪些条件下仍然可纠正误差?

主要发现

  • 在测量强度κ支配旋转速率时,非马尔可夫噪声通过量子Zeno效应本质上被抑制,提升码态保真度。
  • 在马尔可夫噪声下,单靠稳定子测量并不能抑制误差;需要通过路径引导进行主动纠错。
  • 测量结果揭示旋转的综合征子空间,使得能够实时引导以保持演化在码空间内,同时实现目标霍洛诺。
  • 旋转速率、测量速率与跃迁概率之间存在相关性,使通过路径调整实现更快的门且成功概率受控。
Figure 2: Average gate fidelity in the presence of static, $1/f$ noise (with different values of $\tau$ ), and white noise (Markovian errors). Frequent measurements impose a Zeno regime on the system dynamics and suppress the non-Markovian noise, which slows the decay of the average code state fidel
Figure 2: Average gate fidelity in the presence of static, $1/f$ noise (with different values of $\tau$ ), and white noise (Markovian errors). Frequent measurements impose a Zeno regime on the system dynamics and suppress the non-Markovian noise, which slows the decay of the average code state fidel

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