Lorentz Invariance of Entanglement

Details Lorentz Invariance of Entanglement Lorentz Invariance of Entanglement

2002-03-12

arxiv.org/abs/quant-ph/0203051v1

Physics

Quantum Physics

31 pages, 3 figures, submitted to Phys. Rev. A

Scientific paper

We study the transformation of maximally entangled states under the action of Lorentz transformations in a fully relativistic setting. By explicit calculation of the Wigner rotation, we describe the relativistic analog of the Bell states as viewed from two inertial frames moving with constant velocity with respect to each other. Though the finite dimensional matrices describing the Lorentz transformations are non-unitary, each single particle state of the entangled pair undergoes an effective, momentum dependent, local unitary rotation, thereby preserving the entanglement fidelity of the bipartite state. The details of how these unitary transformations are manifested are explicitly worked out for the Bell states comprised of massive spin 1/2 particles and massless photon polarizations. The relevance of this work to non-inertial frames is briefly discussed.

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