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arXiv 2408.06299quant-ph
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稳定子纠缠蒸馏与高效容错编码器

Stabilizer Entanglement Distillation and Efficient Fault-Tolerant Encoders

Yu Shi, Ashlesha Patil, Saikat Guha

AI总结:

本文通过扩展高码率纠缠蒸馏协议、提出常数深度稳定子码解码器以及表面码常数深度容错编解码方案,提升了纠缠蒸馏效率并突破了传统编码器深度限制。

摘要:

纠缠对于量子信息处理至关重要,但受到噪声限制。我们通过开发高产出的纠缠蒸馏协议来解决这一问题,并取得了若干进展。(1) 我们将2到1的递归纠缠蒸馏协议扩展为更高码率的n到(n-1)协议,能够纠正任意单量子比特错误。这些协议通过以保真度和产出率为重点的数值模拟进行评估。我们还概述了一种将任意经典纠错码适配用于纠缠蒸馏的方法,其中通过引入Hadamard门,该码可以同时纠正比特翻转和相位翻转错误。(2) 我们提出了一种用于稳定子码的常数深度解码器,利用单量子比特测量将逻辑态转换为物理态。该解码器被应用于纠缠蒸馏协议,降低了电路深度,并使基于高性能量子纠错码的协议成为可能。我们通过评估基于表面码和量子卷积码的纠缠蒸馏协议的电路复杂度来证明这一点。(3) 我们的稳定子纠缠蒸馏技术推动了量子计算的发展。我们提出了一种在表面码中对任意态进行常数深度编码和解码的容错协议,并具有扩展到更一般的量子低密度奇偶校验码的潜力。该协议可利用最先进的可重构原子阵列实现,并超越了传统对数深度编码器的限制。总体而言,我们的研究整合了稳定子形式体系、基于测量的量子计算和纠缠蒸馏,同时推动了量子通信和量子计算的发展。

英文摘要:

Entanglement is essential for quantum information processing, but is limited by noise. We address this by developing high-yield entanglement distillation protocols with several advancements. (1) We extend the 2-to-1 recurrence entanglement distillation protocol to higher-rate n-to-(n-1) protocols that can correct any single-qubit errors. These protocols are evaluated through numerical simulations focusing on fidelity and yield. We also outline a method to adapt any classical error-correcting code for entanglement distillation, where the code can correct both bit-flip and phase-flip errors by incorporating Hadamard gates. (2) We propose a constant-depth decoder for stabilizer codes that transforms logical states into physical ones using single-qubit measurements. This decoder is applied to entanglement distillation protocols, reducing circuit depth and enabling protocols derived from high-performance quantum error-correcting codes. We demonstrate this by evaluating the circuit complexity for entanglement distillation protocols based on surface codes and quantum convolutional codes. (3) Our stabilizer entanglement distillation techniques advance quantum computing. We propose a fault-tolerant protocol for constant-depth encoding and decoding of arbitrary states in surface codes, with potential extensions to more general quantum low-density parity-check codes. This protocol is feasible with state-of-the-art reconfigurable atom arrays and surpasses the limits of conventional logarithmic depth encoders. Overall, our study integrates stabilizer formalism, measurement-based quantum computing, and entanglement distillation, advancing both quantum communication and computing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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