Nonlocal compensation of pure phase objects with entangled photons

Details Nonlocal compensation of pure phase objects with entangled photons Nonlocal compensation of pure phase objects with entangled photons

2011-06-15

arxiv.org/abs/1106.2914v1

Phys. Rev. A 84, 043817 (2011)

Physics

Quantum Physics

7 pages, 5 figures

Scientific paper

We suggest and demonstrate a scheme for coherent nonlocal compensation of pure phase objects based on two-photon polarization and momentum entangled states. The insertion of a single phase object on one of the beams reduces the purity of the state and the amount of shared entanglement, whereas the original entanglement can be retrieved by adding a suitable phase object on the other beam. In our setup polarization and momentum entangled states are generated by spontaneous parametric downconversion and then purified using a programmable spatial light modulator, which may be also used to impose arbitrary space dependent phase functions to the beams. As a possible application, we suggest and demonstrate a quantum key distribution protocol based on nonlocal phase compensation.

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