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- W4285662486 abstract "We study the problem of measuring errors in non-trace-preserving quantum operations, with a focus on their impact on quantum computing. We propose an error metric that efficiently provides an upper bound on the trace distance between the normalized output states from imperfect and ideal operations, while remaining compatible with the diamond distance. As a demonstration of its application, we apply our metric in the analysis of a lossy beam splitter and a nondeterministic conditional sign-flip gate, two primary non-trace-preserving operations in the Knill-Laflamme-Milburn protocol. We then turn to the leakage errors of neutral-atom quantum computers, finding that these errors scale worse than previously anticipated, implying a more stringent fault-tolerant threshold. We also assess the quantum Zeno gate's error using our metric. In a broader context, we discuss the potential of our metric to analyze general postselected protocols, where it can be employed to study error propagation and estimate thresholds in fault-tolerant quantum computing. The results highlight the critical role of our proposed error metric in understanding and addressing challenges in practical quantum information processing." @default.
- W4285662486 created "2022-07-17" @default.
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- W4285662486 date "2021-10-05" @default.
- W4285662486 modified "2023-10-13" @default.
- W4285662486 title "Error metric for non-trace-preserving quantum operations" @default.
- W4285662486 doi "https://doi.org/10.1103/physreva.108.032609" @default.
- W4285662486 hasPublicationYear "2021" @default.
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