Sequential 3→1 quantum random access code utilizing unsharp measurements

• 作者: Zhiguang Pang Jiang Gao Tianlei Hou Min Wei Jian Li Qin Wang
• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2021,（11）
• 所属期刊栏目: Quantum Optics and Quantum Information
• 页码范围: 133-137
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL202119.112701

摘要

Quantum random access codes[QRACs]are important communication tasks that are usually implemented in prepare-and-measure scenarios.The receiver tries to retrieve one arbitrarily chosen bit of the original bit-string from the code qubit sent by the sender.In this Letter,we analyze in detail the sequential version of the 3 → 1 QRAC with two receivers.The average successful probability for the strategy of unsharp measurement is derived.The prepare-and-measure strategy within pro-jective measurement is also discussed.It is found that sequential 3 → 1 QRAC with weak measurement cannot be always superior to the one with projective measurement,as the 2 → 1 version can be.