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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Single-photon source using parametric down conversion

Shigeki Takeuchi, Ryo Okamoto, Keiji Sasaki

Published Feb 3, 2004• 1 citation
Publisher

Abstract

We report the construction of single photon source using gated parametric fluorescence with the measurement result of the photon number distribution. We succeeded to increase the probability P(1) to find a single photon in a pulse to 26.5%. The availability of the source at room temperature, its long life time, and its wavelength tunability may also be useful for quantum cryptography and photonic quantum computation.

DOI
10.1117/12.505296

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We report the construction of single photon source using gated parametric fluorescence with the measurement result of the photon number distribution. We succeeded to increase the probability P(1) to find a single photon in a pulse to 26.5%. The availability of the source at room temperature, its long life time, and its wavelength tunability may also be useful for quantum cryptography and photonic quantum computation.
The photon-number distribution of an output state from a single-photon source using gated spontaneous parametric downconversion is analyzed in detail. For an improved experimental result of {P(0),P(1),P(2)}={0.59,0.40,0.009}, it is found that P(1) is restricted by the optical loss of the signal photon path (62%) and the cause of nonzero P(2) is the imperfection of the optical shutter for gating. A method by which to reconstruct the photon-number distribution via photon-counting measurement is also presented.
Single photon counting, based on single photon sources and detectors, is a key ingredient for certain applications aiming at new quantum information technologies. Quantum cryptography, quantum radiometry, distributed quantum computing, as well as adjacent technologies such as biomedical and astronomical imaging, and low power classical communication also rely on single-photon technology. This paper reviews the present status of single photon sources and related counting measurement techniques, based on correlated (or heralded) photons in parametric down-conversion, and their possible impact on the above mentioned technologies, as well as an assessment for photon standards in the future.