Two-photon experiments in the frequency domain

I. Mbodji; L. Olislager; E. Woodhead; B. Galmes; J. Cussey; L. Furfaro; P. Emplit; S. Massar; K. Phan Huy; J.-M. Merolla

doi:10.1117/12.923241

4 May 2012 Two-photon experiments in the frequency domain

I. Mbodji, L. Olislager, E. Woodhead, B. Galmes, J. Cussey, L. Furfaro, P. Emplit, S. Massar, K. Phan Huy, J.-M. Merolla

Author Affiliations +

Proceedings Volume 8440, Quantum Optics II; 84400J (2012) https://doi.org/10.1117/12.923241
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

We report on the study of two-photon interference in the frequency domain. Bell and Hong-Ou-Mandel experiments are investigated. These experiments involve the manipulation of photons in the frequency domain, using off-the-shelf telecommunication components such as electro-optic phase modulators and narrow-band frequency filters. In the first experiment, photon pairs entangled in frequency are created and separated. Each photon is then directed through an independent electro-optic phase modulator. Variation of the radio-frequency parameters of the modulation gives rise to a well-controlled Bessel-shape two-photon interference pattern in the frequency domain. This is efficiently measured with narrow-band frequency filters and superconducting single photon detectors. Experimental measurements exhibit high visibilities (over 99 percent both for net and raw visibilities) and allow the (theoretically proven) optimal violation of a Bell inequality for our setup (by more than 18 standard deviations). The second experiment is a Hong-Ou-Mandel experiment in the frequency domain. We show that a grating (spatial domain) or a phase modulator (temporal domain) can be seen as a frequency beam splitter. A broadband spectrum of photon pairs is divided into two interleaved frequency combs, each one used as an independent input to this acting beam splitter. A theoretical calculation shows clear photon anti-bunching behavior.

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I. Mbodji, L. Olislager, E. Woodhead, B. Galmes, J. Cussey, L. Furfaro, P. Emplit, S. Massar, K. Phan Huy, and J.-M. Merolla "Two-photon experiments in the frequency domain", Proc. SPIE 8440, Quantum Optics II, 84400J (4 May 2012); https://doi.org/10.1117/12.923241

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KEYWORDS

Photons

Beam splitters

Diffraction

Modulators

Modulation

Diffraction gratings

Electro optics

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