Virtual entanglement purification via noisy entanglement

• URL: http://arxiv.org/abs/2411.10024v1
• Date: Fri, 15 Nov 2024 08:09:36 GMT
• Title: Virtual entanglement purification via noisy entanglement
• Authors: Kaoru Yamamoto, Yuichiro Matsuzaki, Yasunari Suzuki, Yuuki Tokunaga, Suguru Endo,
• Abstract summary: We present a protocol utilizing virtual operations that purifies noisy entanglement at the level of expectation values. Our protocol bridges the gap between DQC with entanglement and with circuit knitting, thus providing a flexible way for further scalability in the presence of hardware limitations.
• Score: 0.16777183511743468
• License:
• Abstract: Distributed quantum computation (DQC) offers a promising approach for scalable quantum computing, where high-fidelity non-local operations among remote devices are required for universal quantum computation. These operations are typically implemented through teleportation, which consumes high-fidelity entanglement prepared via entanglement purification. However, noisy local operations and classical communication (LOCC) limit the fidelity of purified entanglement, thereby degrading the quality of non-local operations. Here, we present a protocol utilizing virtual operations that purifies noisy entanglement at the level of expectation values. Our protocol offers the following advantages over conventional methods: surpassing the fidelity limit of entanglement purification in the presence of noise in LOCC, requiring fewer sampling shots than circuit knitting, and exhibiting robustness against infidelity fluctuations in shared noisy Bell states unlike probabilistic error cancellation. Our protocol bridges the gap between DQC with entanglement and with circuit knitting, thus providing a flexible way for further scalability in the presence of hardware limitations.

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