Time-Reversed EPR and the Choice of Histories in Quantum Mechanics

Details Time-Reversed EPR and the Choice of Histories in Quantum Mechanics Time-Reversed EPR and the Choice of Histories in Quantum Mechanics

2002-05-29

arxiv.org/abs/quant-ph/0205182v1

Physics

Quantum Physics

6 pages, 5 figures. Presented at the Solvay Conference in Physics, November 2001, Delphi, Greece. To be published in Quantum C

Scientific paper

When a single photon is split by a beam splitter, its two `halves' can entangle two distant atoms into an EPR pair. We discuss a time-reversed analogue of this experiment where two distant sources cooperate so as to emit a single photon. The two `half photons,' having interacted with two atoms, can entangle these atoms into an EPR pair once they are detected as a single photon. Entanglement occurs by creating indistinguishabilility between the two mutually exclusive histories of the photon. This indistinguishabilility can be created either at the end of the two histories (by `erasing' the single photon's path) or at their beginning (by `erasing' the two atoms' positions).

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