Transfer of entanglement from electrons to photons by optical selection rules

Details Transfer of entanglement from electrons to photons by optical selection rules Transfer of entanglement from electrons to photons by optical selection rules

2005-03-29

arxiv.org/abs/cond-mat/0503676v4

New Journal of Physics 7, 186 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages; contribution for the focus issue of New Journal of Physics on "Solid State Quantum Information"; revised in response

Scientific paper

10.1088/1367-2630/7/1/186

The entanglement transfer from electrons localized in a pair of quantum dots to circularly polarized photons is governed by optical selection rules, enforced by conservation of angular momentum. We point out that the transfer can not be achieved by means of unitary evolution unless the angular momentum of the two initial qubit states differs by 2 units. In particular, for spin-entangled electrons the difference in angular momentum is 1 unit -- so the transfer fails. Nevertheless, the transfer can be successfully completed if the unitary evolution is followed by a measurement of the angular momentum of each quantum dot and post-processing of the photons using the measured values as input.

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