Fast and simple characterization of a photon pair source

Abstract

We present an exact model of the detection statistics of a probabilistic source of photon pairs from which a fast, simple and precise method to measure the source's brightness and photon channel transmissions is demonstrated. We measure such properties for a source based on spontaneous parametric downconversion in a periodically poled LiNbO${}_3$ crystal producing pairs at 810 and 1550 nm wavelengths. We further validate the model by comparing the predicted and measured values for the $g^{(2)}(0)$ of a heralded single photon source over a wide range of the brightness. Our model is of particular use for monitoring and tuning the brightness on demand as required for various quantum communication applications. We comment on its applicability to sources involving spectral and/or spatial filtering.

10 pages, 5 figures. Published version

References in corpus (4)

• Heralded Generation of Ultrafast Single Photons in Pure Quantum States
• Quantum key distribution with entangled photon sources
• Simple and efficient quantum key distribution with parametric down-conversion
• Interfacing Collective Atomic Excitations and Single Photons

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