期刊
PHYSICAL REVIEW LETTERS
卷 100, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.100.133601
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资金
- Engineering and Physical Sciences Research Council [EP/C013840/1, EP/E036066/1] Funding Source: researchfish
- EPSRC [EP/C013840/1, EP/E036066/1] Funding Source: UKRI
We present an experimental demonstration of heralded single photons prepared in pure quantum states from a parametric down-conversion source. It is shown that, through controlling the modal structure of the photon pair emission, one can generate pairs in factorable states and thence eliminate the need for spectral filters in multiple-source interference schemes. Indistinguishable heralded photons were generated in two independent spectrally engineered sources and Hong-Ou-Mandel interference observed between them without spectral filters. The measured visibility of 94.4% sets a minimum bound on the mean photon purity.
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