Bright, single-spatial-mode source of frequency non-degenerate, polarization-entangled photon pairs using periodically poled KTP

Pelton, Matthew; Marsden, Philip A.; Ljunggren, Daniel; Tengner, Maria; Karlsson, Anders; Fragemann, Anna; Canalias, Carlota; Laurell, Fredrik

doi:10.1364/opex.12.003573

Cited by 75 publications

(68 citation statements)

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“…Following previous developments by our group in this field [8,9], we built a brighter and more narrowband source of polarization-entangled photon pairs based on collinear SPDC in two 50 mm long orthogonally oriented, periodically poled crystals. According to simulations performed on this source [10], the photon pair generation rate and the bandwidth expected with optimal focusing and single-mode emission are proportional to L 1/2 and 1/L, respectively, where L is the length of each crystal.…”

Section: Introductionmentioning

confidence: 99%

Narrowband polarization-entangled photon pairs distributed over a WDM link for qubit networks

et al. 2007

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We present a bright, narrowband, portable, quasi-phase-matched two-crystal source generating polarization-entangled photon pairs at 809 nm and 1555 nm at a maximum rate of 1.2 × 10 6 s -1 THz -1 mW -1 after coupling to single-mode fiber. The quantum channel at 1555 nm and the synchronization signal gating the single photon detector are multiplexed in the same optical fiber of length 27 km by means of wavelength division multiplexers (WDM) having 100 GHz (0.8 nm) spacing between channels. This implementation makes quantum communication applications compatible with current high-speed optical networks.

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Section: Introductionmentioning

confidence: 99%

Narrowband polarization-entangled photon pairs distributed over a WDM link for qubit networks

et al. 2007

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“…It may be advantageous to use asymmetric SPDC to produce photon-pairs consisting of one visible photon and one O-band photon per pair, such that better quality silicon photon detectors can be used to detect the visible photons for heralding [46,47]. The use of PSM would be beneficial even for this case.…”

Section: Discussionmentioning

confidence: 99%

Efficient heralding of O-band passively spatial-multiplexed photons for noise-tolerant quantum key distribution

Liu¹,

Lim²

2014

Opt. Express

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When implementing O-band quantum key distribution on optical fiber transmission lines carrying C-band data traffic, noise photons that arise from spontaneous Raman scattering or insufficient filtering of the classical data channels could cause the quantum bit-error rate to exceed the security threshold. In this case, a photon heralding scheme may be used to reject the uncorrelated noise photons in order to restore the quantum bit-error rate to a low level. However, the secure key rate would suffer unless one uses a heralded photon source with sufficiently high heralding rate and heralding efficiency. In this work we demonstrate a heralded photon source that has a heralding efficiency that is as high as 74.5%. One disadvantage of a typical heralded photon source is that the long deadtime of the heralding detector results in a significant drop in the heralding rate. To counter this problem, we propose a passively spatial-multiplexed configuration at the heralding arm. Using two heralding detectors in this configuration, we obtain an increase in the heralding rate by 37% and a corresponding increase in the heralded photon detection rate by 16%. We transmitted the O-band photons over 10 km of noisy optical fiber to observe the relation between quantum bit-error rate and noise-degraded second-order correlation function of the transmitted photons. The effects of afterpulsing when we shorten the deadtime of the heralding detectors are also observed and discussed.

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“…Broadband twin photons at 1550 nm were generated, efficiently coupled into a single-mode fiber. Lately [46,48] PP crystals were used to produce efficient sources of frequency non-degenerate, polarization-entangled photon pairs. In PP crystals the theory for mode preparation is equivalent to the bulk except that there is no birefringence, because of the non critical phase-matching.…”

Section: Heralded Single Photons In Periodically Poled Crystalsmentioning

confidence: 99%

“…In Section 4, a review of production of heralded photon sources in bulk nonlinear crystal is provided, discussing various experiments [38][39][40][41][42][43][44][45], both with CW and pulsed pump configurations. In Section 5 we will review attempts to generate heralded single photons in periodically poled crystals [46][47][48][49][50]. Section 6 reviews the use of waveguided periodically poled crystals.…”

Section: Introductionmentioning

confidence: 99%

Heralded single photon sources: a route towards quantum communication technology and photon standards

Castelletto

Scholten

2008

Eur. Phys. J. Appl. Phys.

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Abstract. Single photon counting, based on single photon sources and detectors, is a key ingredient for certain applications aiming at new quantum information technologies. Quantum cryptography, quantum radiometry, distributed quantum computing, as well as adjacent technologies such as biomedical and astronomical imaging, and low power classical communication also rely on single-photon technology. This paper reviews the present status of single photon sources and related counting measurement techniques, based on correlated (or heralded) photons in parametric down-conversion, and their possible impact on the above mentioned technologies, as well as an assessment for photon standards in the future. PACS

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Bright, single-spatial-mode source of frequency non-degenerate, polarization-entangled photon pairs using periodically poled KTP

Cited by 75 publications

References 0 publications

Narrowband polarization-entangled photon pairs distributed over a WDM link for qubit networks

Narrowband polarization-entangled photon pairs distributed over a WDM link for qubit networks

Efficient heralding of O-band passively spatial-multiplexed photons for noise-tolerant quantum key distribution

Heralded single photon sources: a route towards quantum communication technology and photon standards

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