局部封闭类时曲线能够完美区分量子态。

Localized closed timelike curves can perfectly distinguish quantum states.

作者信息

Brun Todd A, Harrington Jim, Wilde Mark M

机构信息

Communication Sciences Institute, Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA.

出版信息

Phys Rev Lett. 2009 May 29;102(21):210402. doi: 10.1103/PhysRevLett.102.210402. Epub 2009 May 27.

DOI:10.1103/PhysRevLett.102.210402

PMID:19519086

Abstract

We show that qubits traveling along closed timelike curves are a resource that a party can exploit to distinguish perfectly any set of quantum states. As a result, an adversary with access to closed timelike curves can break any prepare-and-measure quantum key distribution protocol. Our result also implies that a party with access to closed timelike curves can violate the Holevo bound.

摘要

我们证明，沿着闭合类时曲线传播的量子比特是一种资源，一方可以利用它来完美区分任何一组量子态。因此，能够访问闭合类时曲线的对手可以破解任何制备-测量量子密钥分发协议。我们的结果还意味着，能够访问闭合类时曲线的一方可以违反 Holevo 界。