Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1534628 | Optics Communications | 2014 | 5 Pages |
Quantum optics experiments frequently involve interfering single photons and coherent states. In the case of multi-photon experiments this requires all photons to be frequency degenerate. We report a simple and practical approach to generate coherent states that can be readily tuned to any wavelength required, for example by non-degenerate photon pair creation. We demonstrate this by performing a two-photon (Hong–Ou–Mandel) interference experiment between a coherent state and a pure heralded single photon source. Neither interfering photon passes through a spectral filter, the coherent state is constrained by the pump and seed lasers and the heralded photon exploits non-local filtering. We expect that such an approach can find a wide range of applications in photonic based quantum information science.