Efficient generation of polarization-entangled photons in a nonlinear crystal

Wong, Franco N. C.; Shapiro, Jeffrey H.; Kim, Taehyun

doi:10.1134/s1054660x06110053

Cited by 81 publications

(80 citation statements)

References 26 publications

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“…Figure 1 shows the experimental setup for the pulsed Sagnac source together with the measurement apparatus. We will briefly describe the PSI configuration and more details can be found in previous cw implementations [7,8,9]. The PSI, as shown in the dashed box of Fig.…”

Section: Methodsmentioning

confidence: 99%

“…(7)(8) and obtain the visibility of Eq. (2) as a function of the mean pair generation probability per pulse α.…”

Section: B Multiple-pair Generationmentioning

confidence: 99%

“…The most widely used method for generating polarization-entangled photon pairs is spontaneous parametric down-conversion (SPDC), which can be realized in a number of configurations and by using different crystals [4,5,6,7,8,9,10,11]. A well optimized SPDC source with high flux and high entanglement quality can be utilized to develop advanced enabling quantum technology such as a random number generator [12].…”

Section: Introductionmentioning

confidence: 99%

“…We have previously developed a cw SPDC source of polarization-entangled photons using a polarization Sagnac interferometer (PSI) configuration that is highly efficient and yields a high visibility in two-photon quantum interference [7,8]. The Sagnac source configuration is a phase-stable, single-crystal implementation of interferometrically combined outputs of two identical, coherently-driven down-converters [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Pulsed Sagnac source of narrow-band polarization-entangled photons

Kuzucu

Wong

2008

Phys. Rev. A

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We demonstrate pulsed operation of a bidirectionally pumped polarization Sagnac interferometric down-conversion source and its generation of narrowband, high-visibility polarization-entangled photons. Driven by a narrowband, mode-locked pump at 390.35 nm, the phase-stable Sagnac source with a type-II phase-matched periodically poled KTiOPO4 crystal is capable of producing 0.01 entangled pair per pulse in a 0.15-nm bandwidth centered at 780.7 nm with 1 mW of average pump power at a repetition rate of 31.1 MHz. We have achieved a mean photon-pair generation rate of as high as 0.7 pair per pulse, at which multi-pair events dominate and significantly reduce the two-photon quantum-interference visibility. For low generation probability α, the reduced visibility V = 1 − α is independent of the throughput efficiency and of the polarization analysis basis, which can be utilized to yield an accurate estimate of the generation rate α. At low α we have characterized the source entanglement quality in three different ways: average quantum-interference visibility of 99%, the Clauser-Horne-Shimony-Holt S parameter of 2.739 ± 0.119, and quantum state tomography with 98.85% singlet-state fidelity. The narrowband pulsed Sagnac source of entangled photons is suitable for use in quantum information processing applications such as free-space quantum key distribution.

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Section: Methodsmentioning

confidence: 99%

“…(7)(8) and obtain the visibility of Eq. (2) as a function of the mean pair generation probability per pulse α.…”

Section: B Multiple-pair Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pulsed Sagnac source of narrow-band polarization-entangled photons

Kuzucu

Wong

2008

Phys. Rev. A

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“…In many applications, a nonlinear optical crystal is pumped by a focused laser beam and the emitted SPDC light is collected into a pair of optical waveguides, such as an integrated optical circuit [1] or a fiber network [2]. Efforts over the past decade have led to some very bright SPDC sources [3,4]. As brightness has improved, interest has progressed from simply making SPDC sources brighter to controlling other properties of the emitted photons, such as the spectral entanglement in each photon pair [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Optimal collinear Gaussian beams for spontaneous parametric down-conversion

2010

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I investigate the properties of spontaneous parametric down-conversion (SPDC) involving co-linear Gaussian spatial modes for the pump and the photon collection optics. Approximate analytical and numerical results are obtained for the peak spectral density, photon bandwidth, pair collection probability, heralding ratio, and spectral purity, as a function of crystal length and beam focusing parameters. I address the optimization of these properties individually as well as jointly, and find focusing conditions that simultaneously bring the pair collection probability, heralding ratio, and spectral purity to near-optimal values. These properties are also found to be nearly scale invariant, that is, ultimately independent of crystal length. The results obtained here are expected to be useful for designing SPDC sources with high performance in multiple categories for the next generation of SPDC applications.

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Theoretical and Experimental Foundations

Rambach

2018

Narrowband Single Photons for Light-Matter Interfaces

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Efficient generation of polarization-entangled photons in a nonlinear crystal

Cited by 81 publications

References 26 publications

Pulsed Sagnac source of narrow-band polarization-entangled photons

Pulsed Sagnac source of narrow-band polarization-entangled photons

Optimal collinear Gaussian beams for spontaneous parametric down-conversion

Theoretical and Experimental Foundations

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