Entanglement generation by Fock-state filtration

Details Entanglement generation by Fock-state filtration Entanglement generation by Fock-state filtration

2006-08-07

arxiv.org/abs/quant-ph/0608052v1

Physical Review Letters 98, 203602 (2007)

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.98.203602

We demonstrate a Fock-state filter which is capable of preferentially blocking single photons over photon pairs. The large conditional nonlinearities are based on higher-order quantum interference, using linear optics, an ancilla photon, and measurement. We demonstrate that the filter acts coherently by using it to convert unentangled photon pairs to a path-entangled state. We quantify the degree of entanglement by transforming the path information to polarisation information, applying quantum state tomography we measure a tangle of T=(20+/-9)%.

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