Conditional preparation of single photons using parametric downconversion: a recipe for purity

Mosley, Peter J.; Lundeen, Jeff S.; Smith, Brian J.; Walmsley, Ian A.

doi:10.1088/1367-2630/10/9/093011

Cited by 130 publications

(162 citation statements)

References 21 publications

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“…(8) and (9) are symmetric with respect to the indices r and s, similar constraints apply upon performing the substitution r ↔ s in Eqs. (10) and (11). The Green-function formalism is convenient for describing photon statistics in optical processes such as homodyne detection, frequency conversion, and parametric amplification [36].…”

Section: Theorymentioning

confidence: 99%

“…To this end, instead of neglecting the Heaviside functions as in Eq. (B1), we approximate their product by an effective Gaussian [10,17,26]. For the shifted time variables defined below Eq.…”

Section: Appendix B: Analytic Schmidt Decomposition Of Gaussian Kernelmentioning

confidence: 99%

“…Conversely, for a single-pump configuration, the purity criterion is formulated as −2α rp α sp = (β rs l/2) −2 [10,17] and, in fact, this entails that boundary effects must play an important role. To illustrate, assume that a = 2α 2 rp > (β rs l/2) −2 .…”

Section: Appendix B: Analytic Schmidt Decomposition Of Gaussian Kernelmentioning

confidence: 99%

“…Proposed schemes for realizing efficient linear optical quantum computing rely on the quantum interference between single photons [8] and require that the photons are in pure quantum-mechanical states [9,10]. However, in general, the signal and idler photons generated through SPDC or SFWM exhibit spectral and temporal correlations which compromise the purity of the heralded single-photon state [11].…”

Section: Introductionmentioning

confidence: 99%

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Temporally uncorrelated photon-pair generation by dual-pump four-wave mixing

2016

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We study the preparation of heralded single-photon states using dual-pump spontaneous four-wave mixing. The dual-pump configuration, which in our case employs cross-polarized pumps, allows for a gradual variation of the nonlinear interaction strength enabled by a birefringence-induced walk-off between the pump pulses. The scheme enables the preparation of highly pure heralded single-photon states, and proves to be extremely robust against the effect of nonlinear phase modulation at the required photon-pair production rates.

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Section: Theorymentioning

confidence: 99%

Section: Appendix B: Analytic Schmidt Decomposition Of Gaussian Kernelmentioning

confidence: 99%

Section: Appendix B: Analytic Schmidt Decomposition Of Gaussian Kernelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Temporally uncorrelated photon-pair generation by dual-pump four-wave mixing

2016

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“…Fig. 1 shows the degree of separability, or purity (analogous to the one defined in [20]), of the two photon joint angular correlation function, as a function of the pump waist. We can see that the larger the pump waist (the lower x p ), the lower the purity and consequently the higher the correlation in wavevectors of signal and idler.…”

Section: Pump Focusingmentioning

confidence: 99%

High efficiency coupling of photon pairs in practice

Guerreiro¹,

Martin²,

Sanguinetti³

et al. 2013

Opt. Express

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Abstract:Multi-photon and quantum communication experiments such as loophole-free Bell tests and device independent quantum key distribution require entangled photon sources which display high coupling efficiency. In this paper we put forward a simple quantum theoretical model which allows the experimenter to design a source with high pair coupling efficiency. In particular we apply this approach to a situation where high coupling has not been previously obtained: we demonstrate a symmetric coupling efficiency of more than 80% in a highly frequency non-degenerate configuration. Furthermore, we demonstrate this technique in a broad range of configurations, i.e. in continuous wave and pulsed pump regimes, and for different nonlinear crystals. Nam, R. Ursin, and A. Zeilinger, "Bell violation using entangled photons without the fair-sampling assumption," Nature 497, 227-230 (2013). 16. M. D. C. Pereira, F. E. Becerra, B. L. Glebov, J. Fan, S. W. Nam, and A. Migdall, "Demonstrating highly symmetric single-mode, single-photon heralding efficiency in spontaneous parametric downconversion," Opt. Lett. 38, 1609Lett. 38, -1611Lett. 38, (2013.

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Ultra-fast heralded single photon source based on telecom technology

Ngah

Alibart

Labonté

et al. 2015

Laser & Photonics Reviews

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The realization of an ultra-fast source of heralded single photons emitted at the wavelength of 1540 nm is reported. The presented strategy is based on state-of-the-art telecom technology, combined with off-the-shelf fiber components and waveguide non-linear stages pumped by a 10 GHz repetition rate laser. The single photons are heralded at a rate as high as 2.1 MHz with a heralding efficiency of 42%. Single photon character of the source is inferred by measuring the second-order autocorrelation function. For the highest heralding rate, a value as low as 0.023 is found. This not only proves negligible multi-photon contributions but also represents the best measured value reported to date for heralding rates in the MHz regime. These prime performances, associated with a device-like configuration, are key ingredients for both fast and secure quantum communication protocols.The reliable generation of single photon states is crucial for a wide variety of quantum optical technologies, ranging from quantum computation and communication [1,2] to quantum metrology and detector calibration [3,4]. As an example, the use of single photon states is essential in quantum key distribution (QKD) protocols, where the unintended presence of more than one photon per time window can be exploited by an eavesdropper to extract part of the information [5].Ideal sources should be able to emit indistinguishable single photons in a deterministic way, at an arbitrarily high repetition rate and with zero probability of multiphoton emissions [1]. In particular, the request of ultrafast photon sources is mandatory to speed up data exchanges in quantum communication protocols. In anticipation to such optimal cases, a pertinent alternative is represented by heralded single photon sources (HSPS), where the detection of one photon of two simultaneously generated is used to herald the emission time of the second one [1,6]. In such schemes, the produced single photons rate is proportional to the detected heralding photon one, R H , and to the heralding efficiency, P 1 , namely, the probability of observing one heralded photon per heralding event. We note that, in experiments, the value of P 1 is essentially determined by optical losses [6].In the original and most common implementations, pairs of simultaneous photons are generated in nonlinear crystals via spontaneous parametric down conversion (SPDC) of a pump beam [6]. In particular, an accurate choice of the phase matching can lead to the production of photons at telecom wavelength, as required for long distance transmission in optical fibers [7,8]. SPDC being a probabilistic process, a way to obtain high photon rates is to increase the probability of generating the photon pairs as well as the photon transmission after the SPDC crystal. Accordingly, in the last years, many papers have been focusing on the realization of bright SPDC sources [9,10] and much effort has been made towards optimizing paired photon collection, separation and prop- * Corresponding author: virginia.dauria@unice.fr agati...

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Conditional preparation of single photons using parametric downconversion: a recipe for purity

Cited by 130 publications

References 21 publications

Temporally uncorrelated photon-pair generation by dual-pump four-wave mixing

Temporally uncorrelated photon-pair generation by dual-pump four-wave mixing

High efficiency coupling of photon pairs in practice

Ultra-fast heralded single photon source based on telecom technology

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