All-fiber multiplexed source of high-purity single photons

Francis-Jones, Robert J. A.; Hoggarth, Rowan A.; Mosley, Peter J.

doi:10.1364/optica.3.001270

Cited by 94 publications

(70 citation statements)

References 36 publications

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“…The pair production occurs at random times, meaning the source has to run at a low rate to ensure only one pair is created at a time, so the simultaneous production of, say, 10 pairs from 10 separate sources is not a practical possibility [5]. There has been some progress in multiplexing a large number of heralded photon sources with suitable delays, but this approach still presents technological challenges [6][7][8][9]. A promising solution to this problem is to excite a single quantum system with a trigger pulse, then collect the photon that is spontaneously emitted.…”

Section: Introductionmentioning

confidence: 99%

Efficient excitation of dye molecules for single photon generation

et al. 2018

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A reliable single photon source is required for many aspects of quantum technology. Organic molecules are attractive for this application because they can have high quantum yield and can be photostable, even at room temperature. To generate a photon with high probability, a laser must excite the molecule efficiently. We develop a simple model for that efficiency and discuss how to optimise it. We demonstrate the validity of our model through experiments on a single dibenzoterrylene (DBT) molecule in an anthracene crystal. We show that the excitation probability cannot exceed 75% at room temperature, but can increase to over 99% if the sample is cooled to liquid nitrogen temperature. The possibility of high photon generation efficiency with only modest cooling is a significant step towards a reliable photon source that is simple and practical.

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Section: Introductionmentioning

confidence: 99%

Efficient excitation of dye molecules for single photon generation

et al. 2018

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“…In the specific application of an on-demand single-photon source, a flurry of recent experiments [13][14][15][16] have exploited active temporal switching to synthesize photons from multiple time bins; these examples employ free-space or fiberized switches to route a particular photon through the desired delay line. On the other hand, in classical photonics, tremendous progress has been made in alternative dispersion-based delay systems, with switching speeds approaching the GHz regime.…”

confidence: 99%

High-speed switching of biphoton delays through electro-optic pump frequency modulation

et al. 2016

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The realization of high-speed tunable delay control has received significant attention in the scene of classical photonics. In quantum optics, however, such rapid delay control systems for entangled photons have remained undeveloped. Here for the first time, we demonstrate rapid (2.5 MHz) modulation of signal-idler arrival times through electro-optic pump frequency modulation. Our technique applies the quantum phenomenon of nonlocal dispersion cancellation along with pump frequency tuning to control the relative delay between photon pairs. Chirped fiber Bragg gratings are employed to provide large amounts of dispersion which result in biphoton delays exceeding 30 ns. This rapid delay modulation scheme could be useful for on-demand single-photon distribution in addition to quantum versions of pulse position modulation.

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“…Additionally, most schemes for producing unfiltered pure heralded photons rely critically on the use of broadband pumps [22,24]. In the case of photonic crystal fibers, which has been one of the primary platforms for demonstration of pure single-photon generation [14,39], it is desirable to use short pump pulses and shorter fiber lengths to reduce the impact of fabrication imperfections along the fiber length [40,41]. However, little attention has been devoted to study the impact on temporal and spectral correlations of generated photon pairs under a noninstantaneous nonlinear material response, which may become important for short pump pulses.…”

Section: Introductionmentioning

confidence: 99%

Effects of noninstantaneous nonlinear processes on photon-pair generation by spontaneous four-wave mixing

2017

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We present a general model, based on a Hamiltonian approach, for the joint quantum state of photon pairs generated through pulsed spontaneous four-wave mixing, including nonlinear phase modulation and a finite material response time. For the case of a silica fiber, it is found that the pair-production rate depends weakly on the waveguide temperature, due to higher-order Raman scattering events, and more strongly on pump-pair frequency detuning. From the analytical model, a numerical scheme is derived, based on the well-known split-step method. This scheme allows computation of joint states where nontrivial effects are included, such as groupvelocity dispersion and Raman scattering. In this work, the numerical model is used to study the impact of the noninstantaneous response on the prefiltering purity of heralded single photons. We find that for pump pulses shorter than 1 ps, a significant detuning-dependent change in quantum-mechanical purity may be observed in silica. This shows that Raman scattering not only introduces noise, but can also drastically change the spectral correlations in photon pairs when pumped with short pulses.

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All-fiber multiplexed source of high-purity single photons

Cited by 94 publications

References 36 publications

Efficient excitation of dye molecules for single photon generation

Efficient excitation of dye molecules for single photon generation

High-speed switching of biphoton delays through electro-optic pump frequency modulation

Effects of noninstantaneous nonlinear processes on photon-pair generation by spontaneous four-wave mixing

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