Correlated photon-pair generation in reverse-proton-exchange PPLN waveguides with integrated mode demultiplexer at 10 GHz clock

Zhang, Qiang; Xie, Xiaozhu; Takesue, Hiroki; Nam, Sae Woo; Langrock, Carsten; Fejer, M. M.; Yamamoto, Yoshihisa

doi:10.1364/oe.15.010288

Cited by 60 publications

(82 citation statements)

References 15 publications

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“…The laser is first frequency doubled via second harmonic generation (SHG) so as to fulfill the SPDC phase matching condition for generating both heralding (signal) and heralded (idler) photons in the C-band of telecom wavelengths. As discussed in [16] and [19][20][21], the high-repetition rate laser allows generating photon pairs at a high rate while maintaining n as low as required for negligible two-photon events. In our work, we provide an experimental proof of this statement, by actually measuring the second order autocorrelation function g (2) (0) of our heralded photons.…”

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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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Ultra-fast heralded single photon source based on telecom technology

Ngah

Alibart

Labonté

et al. 2015

Laser & Photonics Reviews

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“…Many integrated quantum devices have been fabricated, ranging from waveguide sources [1][2][3][4][5][6] and entanglement sources [7][8][9][10][11][12] to on-chip detectors [13,14], from quantum teleporters [15] to complex linear circuits [16] with photonic manipulation [17]. However, the functioning of these circuits still relies on the careful alignment of external bulk components, limiting usefulness outside the lab.…”

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confidence: 99%

High-Efficiency Plug-and-Play Source of Heralded Single Photons

et al. 2017

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Reliable generation of single photons is of key importance for fundamental physical experiments and to demonstrate quantum technologies. Waveguide-based photon pair sources have shown great promise in this regard due to their large degree of spectral tunability, high generation rates and long photon coherence times. However, for such a source to have real world applications it needs to be efficiently integrated with fiber-optic networks. We answer this challenge by presenting an alignment-free source of photon pairs in the telecommunications band that maintains heralding efficiency > 50 % even after fiber pigtailing, photon separation, and pump suppression. The source combines this outstanding performance in heralding efficiency with a compact, stable, and easy-touse 'plug & play' package: one simply connects a laser to the input and detectors to the output and the source is ready to use. This high performance can be achieved even outside the lab without the need for alignment which makes the source extremely useful for any experiment or demonstration needing heralded single photons.

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“…There have been few quantum-communication experiments at gigahertz clock rates and, very recently, some authors of this letter have developed a correlated photon-pair system at a 10-GHz clock rate [6]. Here, we present 10-GHz-clock sequential time-bin entangled photon pair generation in reverse-proton-exchange (RPE) periodically poled lithium niobate (PPLN) waveguides based on mode demultiplexing and parametric down-conversion.…”

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“…Each pulse duration is 2 Our entanglement is a sequential time-bin entanglement at a 10-GHz clock rate. Instead of using mode-locked laser pulses as described in reference [6,9], we use a Mach-Zehnder (MZ) interferometer to modulate a CW laser with a wavelength of 1559nm at 10 GHz, increasing the phase stability. In order to obtain shorter pulse, the bias voltage of the modulator was set at a small value and the modulator was operated in nonlinear regime.…”

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confidence: 99%

“…From the histogram, we can estimate an 80-ps timing jitter (FWHM) and 200-ps full width at tenth maximum (FWTM) for the coincidence events. In the experiment, we launch 2 mW pump power into the Y-junction PPLN waveguide and measured the coincidence to accidental coincidence ratio (CAR) [5,6]. The CAR is a good figure of merit to demonstrate the contribution from the noise in the coincidence measurement and also provides an estimate of the average photon-pair number and the entanglement visibility.…”

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Generation of 10-GHz clock sequential time-bin entanglement

Zhang¹,

Langrock²,

Takesue³

et al. 2008

Opt. Express

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This letter reports telecom-band sequential time-bin entangled photon-pair generation at a repetition rate of 10 GHz in periodically-poled reverse-proton-exchange lithium niobate waveguides based on mode demultiplexing. With up-conversion single-photon detectors, we observed a two-photon-interference-fringe visibility of 85.32% without subtraction of accidental noise contributions, which can find broad application in quantum information and quantum entanglement research.

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Correlated photon-pair generation in reverse-proton-exchange PPLN waveguides with integrated mode demultiplexer at 10 GHz clock

Cited by 60 publications

References 15 publications

Ultra-fast heralded single photon source based on telecom technology

Ultra-fast heralded single photon source based on telecom technology

High-Efficiency Plug-and-Play Source of Heralded Single Photons

Generation of 10-GHz clock sequential time-bin entanglement

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