Relativistic invariant quantum entanglement between the spins of moving bodies

Hui Li and Jiangfeng Du
Phys. Rev. A 68, 022108 – Published 25 August 2003
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Abstract

The entanglement between the spins of a pair of particles may change because the spin and momentum become mixed when viewed by a moving observer [R. M. Gingrich and C. Adami, Phys. Rev. Lett. 89, 270402 (2002)]. In this paper, it is shown that, if the momenta are appropriately entangled, the entanglement between the spins of the Bell states can remain maximal when viewed by any moving observer. Based on this observation, a relativistic invariant protocol for quantum communication is suggested, with which the nonrelativistic quantum information theory could be invariantly applied to relativistic situations.

  • Received 28 March 2003

DOI:https://doi.org/10.1103/PhysRevA.68.022108

©2003 American Physical Society

Authors & Affiliations

Hui Li1,* and Jiangfeng Du1,2,3,†

  • 1Structure Research Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 2Department of Physics, National University of Singapore, Lower Kent Ridge, Singapore 119260, Singapore
  • 3Centre for Quantum Computation, DAMTP, University of Cambridge, Wilberforce Road, Cambridge CB3 OWA, United Kingdom

  • *Electronic address: lhuy@mail.ustc.edu.cn
  • †Electronic address: djf@ustc.edu.cn

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Vol. 68, Iss. 2 — August 2003

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