Signal Enhancement and Background Suppression Using Interference and Entanglement

Details Signal Enhancement and Background Suppression Using Interference and Entanglement Signal Enhancement and Background Suppression Using Interference and Entanglement

2010-03-01

arxiv.org/abs/1003.0423v2

Physics

Quantum Physics

9 pages, 3 figures, to appear in Physical Review A

Scientific paper

We describe two-photon absorption processes excited by entangled pairs, but not by non-entangled pairs of the same energy and polarization. Photon states are selected for destructive interference in the non-entangled process between different sequences of absorption via multiple intermediate states. A non-zero entangled absorption cross section is obtained by varying the entanglement time and pair delay parameters. Detailed energy and polarization requirements are derived for Rb 5S1/2 --> 5D3/2 transitions. Applications to Quantum Steganography and Quantum Key Distribution are discussed.

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