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arXiv 2303.07907quant-ph
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弱纠缠仅使用乘积测量改进量子通信

Weak entanglement improves quantum communication using only product measurements

Amélie Piveteau, Alastair A. Abbott, Sadiq Muhammad, Mohamed Bourennane, Armin Tavakoli

AI总结:

本文证明仅用乘积测量或部分贝尔态分析器,弱纠缠甚至不可导引的含噪态也能提升量子比特信道中秘密共享任务的成功率,并在实验中超越最佳无纠缠辅助协议,表明简单测量能克服大量噪声。

摘要:

我们证明,仅使用对单个光子的独立、无干涉测量,弱纠缠态就能改进量子比特信道上的通信。我们引入了一项对应于密码学原语“秘密共享”的通信任务,并证明所有可导引的两量子比特各向同性态,仅使用乘积测量即可在成功率上提供量子优势。此外,我们证明此类测量甚至能从不具备量子导引的含噪部分纠缠态中揭示通信优势。我们进一步考虑了基于更复杂但标准的部分贝尔态分析器的秘密共享的随机变体,并证明它也能为一系列不可导引的各向同性态揭示优势。通过将偏振量子比特制备于不可导引态中,我们在实验上证明了两种秘密共享任务的改进成功率超越了最佳的无纠缠辅助量子比特协议。我们的结果揭示了在纠缠辅助量子通信中,简单且可扩展的测量克服大量噪声的能力。

英文摘要:

We show that weakly entangled states can improve communication over a qubit channel using only separate, interference-free, measurements of individual photons. We introduce a communication task corresponding to the cryptographic primitive known as secret sharing and show that all steerable two-qubit isotropic states provide a quantum advantage in the success rate using only product measurements. Furthermore, we show that such measurements can even reveal communication advantages from noisy partially entangled states that admit no quantum steering. We then go further and consider a stochastic variant of secret sharing based on more sophisticated, yet standard, partial Bell state analysers, and show that this reveals advantages also for a range of unsteerable isotropic states. By preparing polarisation qubits in unsteerable states, we experimentally demonstrate improved success rates of both secret sharing tasks beyond the best entanglement-unassisted qubit protocol. Our results reveal the capability of simple and scalable measurements in entanglement-assisted quantum communication to overcome large amounts of noise.

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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