Photon pair generation in birefringent optical fibers

Smith, Brian J.; Mahou, Pierre; Cohen, Offir; Lundeen, Jeff S.; Walmsley, Ian A.

doi:10.1364/oe.17.023589

Cited by 152 publications

(171 citation statements)

References 71 publications

(124 reference statements)

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“…However, all of these methods share a common downside in that they result in additional photon losses and, consequently, lead to lower * jesbch@fotonik.dtu.dk single-photon rates. This has provided an incentive, leading researchers to a search for a means of reducing the need for postprocess filtering and, in fact, much success has been achieved by carefully controlling the dispersion properties of the nonlinear optical waveguide [17][18][19][20][21][22][23]. The research has almost exclusively been focused on single-pump configurations, even though such schemes, without filtering, do not allow for entirely pure heralded single photons.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

2016

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“…Building on previous work from our group [12], we have concentrated on the use of few-mode, weakly guiding, birefringent fibers [13][14][15][16] as a useful experimental platform for the study of two-photon states which can exhibit hybrid entanglement in frequency and transverse mode. In such fibers, while all six electromagnetic field components of the supported modes are non-zero, they may be well approximated by linearly polarized (LP) modes.…”

Section: Introductionmentioning

confidence: 99%

Photon-pair generation by intermodal spontaneous four-wave mixing in birefringent, weakly guiding optical fibers

Garay-Palmett¹,

Cruz-Delgado²,

Domínguez-Serna³

et al. 2016

Phys. Rev. A

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We present a theoretical and experimental study of the generation of photon pairs through the process of spontaneous four wave mixing (SFWM) in a few-mode, birefringent fiber. Under these conditions, multiple SFWM processes are in fact possible, each associated with a different combination of transverse modes for the four waves involved. We show that in the weakly guiding regime, for which the propagation modes may be well approximated by linearly polarized modes, the departure from circular symmetry due to the fiber birefringence translates into conservation rules which retain elements from azimuthal and rectangular symmetries: both OAM and parity must be conserved for a process to be viable. We have implemented a SFWM source based on a "bow-tie" birefringent fiber, and have measured for a collection of pump wavelengths the SFWM spectra of each of the signal and idler photons in coincidence with its partner photon. We have used this information, together with knowledge of the transverse modes into which the signal and idler photons are emitted, as input for a genetic algorithm which accomplishes two tasks: i) the identification of the particular SFWM processes which are present in the source, and ii) the characterization of the fiber used.

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“…and the symmetric scheme for producing single photons of high prefiltering purity [50]. In this scheme, the waveguide is designed so that β 1s = −β 1r and the waveguide length L is chosen to maximize purity.…”

Section: B Numerical Results On the Impact Of Raman Scattering On Phmentioning

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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Photon pair generation in birefringent optical fibers

Cited by 152 publications

References 71 publications

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

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

Photon-pair generation by intermodal spontaneous four-wave mixing in birefringent, weakly guiding optical fibers

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

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