量子过程非线性特性的稳健估计

IF 2.9 2区 物理与天体物理 Q2 Physics and Astronomy
Yuqing Wang, Guoding Liu, Zhenhuan Liu, Yifan Tang, Xiongfeng Ma, Hao Dai
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引用次数: 0

摘要

准确而稳健地估计量子过程特性对于量子信息处理和多体物理学至关重要。Helsen 等人结合经典阴影层析成像和随机基准,提出了一种估算量子过程线性特性的方法。在这项工作中,我们将重点放在对状态准备和测量误差具有鲁棒性的非线性过程特性的估计协议上。我们介绍了两种协议,它们都利用随机门序列,但采用了不同的后处理方法,使它们适用于测量不同的非线性特性。第一种方案提供了一种稳健可靠的方法来估算超时序相关性,这在伊辛模型中得到了数值证明。第二个协议估算了单位性,有效地描述了量子通道的不一致性。我们希望这两个协议能成为探索量子多体物理和描述量子过程的有用工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Robust estimation of nonlinear properties of quantum processes

Robust estimation of nonlinear properties of quantum processes
The accurate and robust estimation of quantum process properties is crucial for quantum information processing and many-body physics. Combining classical shadow tomography and randomized benchmarking, Helsen et al. introduced a method to estimate the linear properties of quantum processes. In this work, we focus on the estimation protocols of nonlinear process properties that are robust to state preparation and measurement errors. We introduce two protocols, both utilizing random gate sequences but employing different postprocessing methods, which make them suitable for measuring different nonlinear properties. The first protocol offers a robust and sound method to estimate the out-of-time-ordered correlation, as demonstrated numerically in an Ising model. The second protocol estimates unitarity, effectively characterizing the incoherence of quantum channels. We expect the two protocols to be useful tools for exploring quantum many-body physics and characterizing quantum processes.
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来源期刊
Physical Review A
Physical Review A 物理-光学
CiteScore
5.40
自引率
24.10%
发文量
0
审稿时长
2.2 months
期刊介绍: Physical Review A (PRA) publishes important developments in the rapidly evolving areas of atomic, molecular, and optical (AMO) physics, quantum information, and related fundamental concepts. PRA covers atomic, molecular, and optical physics, foundations of quantum mechanics, and quantum information, including: -Fundamental concepts -Quantum information -Atomic and molecular structure and dynamics; high-precision measurement -Atomic and molecular collisions and interactions -Atomic and molecular processes in external fields, including interactions with strong fields and short pulses -Matter waves and collective properties of cold atoms and molecules -Quantum optics, physics of lasers, nonlinear optics, and classical optics
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