Relativity of quantum states in entanglement swapping

被引：5

作者：

Nagele, Chris ^{[1
,2
,3
]}

Ilo-Okeke, Ebubechukwu O. ^{[2
,4
]}

Rohde, Peter P. ^{[5
]}

Dowling, Jonathan P. ^{[6
,7
,8
,9
,10
]}

Byrnes, Tim ^{[1
,2
,3
,9
,11
]}

机构：

[1] East China Normal Univ, Sch Phys & Mat Sci, State Key Lab Precis Spect, Shanghai 200062, Peoples R China

[2] New York Univ Shanghai, 1555 Century Ave, Shanghai 200122, Peoples R China

[3] NYU, Dept Phys, 4 Washington Pl, New York, NY 10003 USA

[4] Fed Univ Technol Owerri, Sch Phys Sci, Dept Phys, PMB 1526, Owerri 460001, Imo State, Nigeria

[5] Univ Technol Sydney, Fac Engn & Informat Technol, Ctr Quantum Software & Informat QSI, Sydney, NSW 2007, Australia

[6] Louisiana State Univ, Hearne Inst Theoret Phys, Baton Rouge, LA 70803 USA

[7] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[8] Natl Inst Informat & Commun Technol, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan

[9] NYU Shanghai, NYU ECNU Inst Phys, 3663 Zhongshan Rd North, Shanghai 200062, Peoples R China

[10] Univ Sci & Technol China, CAS Alibaba Quantum Comp Lab, Shanghai 201315, Peoples R China

[11] Natl Inst Informat, Chiyoda Ku, 2-1-2 Hitotsubashi, Tokyo 1018430, Japan

来源：

PHYSICS LETTERS A | 2020年 / 384卷 / 15期

基金：

澳大利亚研究理事会; 美国国家科学基金会; 中国国家自然科学基金;

关键词：

Quantum information; Entanglement swapping; Special relativity; DELAYED-CHOICE; TELEPORTATION; INFORMATION; SPEED;

D O I：

10.1016/j.physleta.2020.126301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The entanglement swapping protocol is analyzed in a relativistic setting, where shortly after the entanglement swapping is performed, a Bell test is performed. For an observer in the laboratory frame, a Bell violation is observed between the qubits with the swapped entanglement. In a moving frame, the order of the measurements is reversed, and a Bell violation is observed even though the particles are not entangled, directly or indirectly, or at any point in time. Although the measurement results are identical, the wavefunctions for the two frames are starkly different - one is entangled and the other is not. Furthermore, for boosts in a perpendicular direction, in the presence of decoherence, we show that the maximum Bell violation can occur across non-simultaneous points in time. This is a signature of entanglement that is spread across both space and time, showing both non-local and non-simultaneous aspects of entanglement. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：7

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