Entanglement generation by fock-state filtration

K. J. Resch; J. L. O'Brien; T. J. Weinhold; K. Sanaka; B. P. Lanyon; N. K. Langford; A. G. White

doi:10.1103/PhysRevLett.98.203602

Entanglement generation by fock-state filtration

K. J. Resch, J. L. O'Brien, T. J. Weinhold, K. Sanaka, B. P. Lanyon, N. K. Langford, A. G. White

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Abstract

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 polarization information; applying quantum state tomography we measure a tangle of T=(20±9)%.

Original language	English
Article number	203602
Journal	Physical Review Letters
Volume	98
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.98.203602
Publication status	Published - 16 May 2007
Externally published	Yes

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AU - White, A. G.

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Entanglement generation by fock-state filtration

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