Entanglement of a photon and a collective atomic excitation

Details Entanglement of a photon and a collective atomic excitation Entanglement of a photon and a collective atomic excitation

2005-07-17

arxiv.org/abs/quant-ph/0507161v1

Physical Review Letters 95, 040405 (2005)

Physics

Quantum Physics

Phys. Rev. Lett., in press (submitted April 29, 2005), 4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.95.040405

We describe a new experimental approach to probabilistic atom-photon (signal) entanglement. Two qubit states are encoded as orthogonal collective spin excitations of an unpolarized atomic ensemble. After a programmable delay, the atomic excitation is converted into a photon (idler). Polarization states of both the signal and the idler are recorded and are found to be in violation of the Bell inequality. Atomic coherence times exceeding several microseconds are achieved by switching off all the trapping fields - including the quadrupole magnetic field of the magneto-optical trap - and zeroing out the residual ambient magnetic field.

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