Entanglement Generation by Fock-State Filtration | Zendy

K. J. Resch | Zendy; Jeremy L. O’Brien | Zendy; T. J. Weinhold | Zendy; Kaoru Sanaka | Zendy; B. P. Lanyon | Zendy; Nathan K. Langford | Zendy; A. G. White | Zendy

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Entanglement Generation by Fock-State Filtration

Author(s) -

K. J. Resch,

Jeremy L. O’Brien,

T. J. Weinhold,

Kaoru Sanaka,

B. P. Lanyon,

Nathan K. Langford,

A. G. White

Publication year - 2007

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.98.203602

Subject(s) - quantum entanglement , physics , fock state , photon , fock space , quantum optics , polarization (electrochemistry) , measure (data warehouse) , quantum mechanics , quantum state , path integral formulation , quantum information , quantum , computer science , chemistry , database

We demonstrate a Fock-state filter which is capable of preferentiallyblocking single photons over photon pairs. The large conditional nonlinearitiesare based on higher-order quantum interference, using linear optics, an ancillaphoton, and measurement. We demonstrate that the filter acts coherently byusing it to convert unentangled photon pairs to a path-entangled state. Wequantify the degree of entanglement by transforming the path information topolarisation information, applying quantum state tomography we measure a tangleof T=(20+/-9)%.Comment: 4 pages, 3 figure

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