期刊
PHYSICAL REVIEW LETTERS
卷 98, 期 20, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.98.203602
关键词
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资金
- EPSRC [EP/F008023/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F008023/1] Funding Source: researchfish
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)%.
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