Experimental studies in generation of high-purity photon-pairs using cascaded χ^(2) processes in a periodically poled LiNbO_3 ridge-waveguide device

Arahira, S.; Namekata, Naoto; Kishimoto, Tadashi; Inoue, Shuichiro

doi:10.1364/josab.29.000434

Cited by 13 publications

(4 citation statements)

References 38 publications

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“…3. The scheme for generating correlated photon-pairs is cascaded second-harmonic generation (SHG) and spontaneous parametric down conversion (SPDC) processes in a single periodically poled lithium niobate (PPLN) waveguide [49,50,[81][82][83] (the main parameters of the PPLN see Table S. I).…”

Section: Note 2: Heralded Single Photon Sourcementioning

confidence: 99%

Storage of 1650 modes of single photons at telecom wavelength

Wei¹,

Jing

Zhang

et al. 2022

Preprint

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To advance the full potential of quantum networks one should be able to distribute quantum resources over long distances at appreciable rates. As a consequence, all components in the networks need to have large multimode capacity to manipulate photonic quantum states. Towards this end, a multimode photonic quantum memory, especially one operating at telecom wavelength, remains a key challenge. Here we demonstrate a spectro-temporally multiplexed quantum memory at 1532 nm. Multimode quantum storage of telecom-band heralded single photons is realized by employing the atomic frequency comb protocol in a 10-m-long cryogenically cooled erbium doped silica fibre. The multiplexing encompasses five spectral channels - each 10 GHz wide - and in each of these up to 330 temporal modes, resulting in the simultaneous storage of 1650 modes of single photons. Our demonstrations open doors for high-rate quantum networks, which are essential for future quantum internet.

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Section: Note 2: Heralded Single Photon Sourcementioning

confidence: 99%

Storage of 1650 modes of single photons at telecom wavelength

Wei¹,

Jing

Zhang

et al. 2022

Preprint

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“…Importantly, we experimentally demonstrate efficient and broadband telecom photon-pair generation in a single LPLN waveguide through a cascaded SHG and SPDC scheme. This scheme only requires standard telecom components (such as telecom laser and dense wavelength division multiplexer) and eliminates the need for visible pump lasers or extra SHG modules [38][39][40][41][42] . In a 3.3 mm long LPLN waveguide, we observed broadband correlated photon pairs spanning the telecom S, C, and L bands, with a normalized brightness of 3.1×10 6 Hz nm −1 mW −2 , which is among the highest achieved in nanophotonic waveguides with similar configurations.…”

Section: Introductionmentioning

confidence: 99%

Efficient photon-pair generation in layer-poled lithium niobate nanophotonic waveguides

Zhu,

Shi,

Mohanraj

et al. 2024

Preprint

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Integrated photon-pair sources are crucial for scalable photonic quantum systems. Thin-film lithium niobate is a promising platform for on-chip photon-pair generation through spontaneous parametric down-conversion (SPDC). However, the device implementation faces practical challenges. Periodically poled lithium niobate (PPLN), despite enabling flexible quasi-phase matching, suffers from poor fabrication reliability and device repeatability, while conventional modal phase matching (MPM) methods yield limited efficiencies due to inadequate mode overlaps. Here, we introduce a layer-poled lithium niobate (LPLN) nanophotonic waveguide for efficient photon-pair generation. It leverages layer-wise polarity inversion through electrical poling to break spatial symmetry and significantly enhance nonlinear interactions for MPM, achieving a notable normalized second-harmonic generation (SHG) conversion efficiency of 4615% W-1 cm-2. Through a cascaded SHG and SPDC process, we demonstrate photon-pair generation with a normalized brightness of 3.1×106 Hz nm-1 mW-2 in a 3.3 mm long LPLN waveguide, surpassing existing on-chip sources under similar operating configurations. Crucially, our LPLN waveguides offer enhanced fabrication reliability and reduced sensitivity to geometric variations and temperature fluctuations compared to PPLN devices. We expect LPLN to become a promising solution for on-chip nonlinear wavelength conversion and non-classical light generation, with immediate applications in quantum communication, networking, and on-chip photonic quantum information processing.

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“…We choose symmetric spontaneous parametric down-conversion (SPDC) in a periodically-poled lithium niobate (PPLN) waveguide [25][26][27][28][29][30][31][32][33][34] as our source of O-band photon-pairs because of its high SPDC efficiency and low output coupling loss. The heralding efficiency of our HPS is measured to be 74.5%.…”

Section: Introductionmentioning

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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Experimental studies in generation of high-purity photon-pairs using cascaded χ^(2) processes in a periodically poled LiNbO_3 ridge-waveguide device

Cited by 13 publications

References 38 publications

Storage of 1650 modes of single photons at telecom wavelength

Storage of 1650 modes of single photons at telecom wavelength

Efficient photon-pair generation in layer-poled lithium niobate nanophotonic waveguides

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

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