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Quantum Information and Measurement (QIM)

On-chip monolithic integration of heralded single photons sources and beam splitters

J. Belhassen, Yacine Halioua, Qi-Feng Yao, Guillaume Boucher, Aristide Lemaître, Maria I. Amanti, F. Baboux, W. Steven Kolthammer, Ian A. Walmsley, S. Ducci

Published Jan 1, 2017• 1 citation
Publisher

Abstract

We demonstrate the monolithic integration of a heralded single photon AlGaAs source and a 50/50 beamsplitter. A cross correlation measurement on the beamsplitter output ports reveals the quantum nature of the generated light.
DOI
10.1364/qim.2017.qw5b.3

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We demonstrate a monolithic III-V photonic circuit combining a heralded single photon source with a beamsplitter, at room temperature and telecom wavelength. Pulsed parametric down-conversion in an AlGaAs waveguide generates counterpropagating photons, one of which is used to herald the injection of its twin into the beamsplitter. We use this configuration to implement an integrated Hanbury-Brown and Twiss experiment, yielding a heralded second-order correlation gher(2)(0)=0.10±0.02 that confirms single-photon operation. The demonstrated generation and manipulation of quantum states on a single III-V semiconductor chip opens promising avenues towards real-world applications in quantum information.
Time correlated photon pairs are used to produce heralded single photon states for quantum integrated circuits. These states are generated by photon sources, which are called heralded single photon sources. They are based on the detection of one photon which heralds the presence of the other. In this way, pure single photon states can be probabilistically generated and, subsequently, manipulated in complex photonic circuits. Heralded single photon sources are the topic of this review. The authors detail the main parameters and the experiments involved in their characterization, with a focus on their use in integrated photonic circuits. Different geometries and technological platforms are compared, and an assessment of their performances is performed. The final result is that nearly perfect single photon sources are possible and feasible in an integrated platform. A few open issues are also underlined.
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