Non-classical two-photon interference between independent telecom light pulses converted by difference-frequency generation

Abstract

We experimentally demonstrated the Hong-Ou-Mandel (HOM) interference between two photons after visible-to-telecommunication wavelength conversion. In the experiment, we prepared a heralded single photon by using spontaneous parametric down-conversion and the other photon from a weak laser source at 780 nm. We converted the wavelength of both photons to the telecommunication wavelength of 1522 nm by using difference-frequency generation in a periodically-poled lithium niobate, and then observed the HOM interference between the photons. The observed visibility is $0.76\pm 0.12$ which clearly shows the non-classical interference of the two photons. The high-visibility interference is an important step for fiber-based quantum communications of photons generated from visible photon emitters.

4 pages, 4 figures

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Cited by in corpus (6)

• Frequency-domain Hong-Ou-Mandel interference
• A Waveguide Frequency Converter Connecting Rubidium Based Quantum Memories to the Telecom C-Band
• Pulsed source of spectrally uncorrelated and indistinguishable photons at telecom wavelengths
• Mach-Zehnder interferometer using frequency-domain beamsplitter
• Observation of two output light pulses from a partial wavelength converter preserving phase of an input light at a single-photon level
• Wave-particle duality of light appearing in the intensity interferometric situation