Compact polarization-entangled photon-pair source based on a dual-periodically-poled Ti:LiNbO<sub>3</sub> waveguide

Sun, Changwei; Wu, Su-Heng; Duan, Jia-Chen; Zhou, Jianwei; Xia, Junlei; Xu, Ping; Xie, Zhenda; Gong, Yan‐Xiao; Zhu, Shining

doi:10.1364/ol.44.005598

Cited by 26 publications

(10 citation statements)

References 34 publications

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“…When the pump power coupled into the waveguide is 21.4 µW, the coincidence, accidental coincidence, and single counts are measured to be 1317 Hz, 12 Hz, 159 kHz, and 215 kHz, respectively, within the 0.8 nm bandwidth of WDM filter. A spectrum brightness of 1.53×10 9 Hz/nm/mW can be calculated, which is 1~2 orders of magnitude higher than the best result of the other photon pair sources (after normalization of the polling length) [20,[37][38][39][40][41]. The above results fully reveal the advantage of the PPLNOI-based SPDC source with tight mode confinement.…”

Section: Source Characterizationmentioning

confidence: 65%

Ultrabright Multiplexed Energy-Time-Entangled Photon Generation from Lithium Niobate on Insulator Chip

et al. 2021

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High-flux entangled photon source is the key resource for quantum optical study and application. Here it is realized in a lithium niobate on isolator (LNOI) chip, with 2.79×10 11 Hz/mW photon pair rate and 1.53×10 9 Hz/nm/mW spectral brightness. These data are boosted by over two orders of magnitude compared to existing technologies. A 130-nm broad bandwidth is engineered for 8-channel multiplexed energy-time entanglement. Harnessed by high-extinction frequency correlation and Franson interferences up to 99.17% visibility, such energy-time entanglement multiplexing further enhances high-flux data rate, and warrants broad applications in quantum information processing on a chip.

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Section: Source Characterizationmentioning

confidence: 65%

Ultrabright Multiplexed Energy-Time-Entangled Photon Generation from Lithium Niobate on Insulator Chip

et al. 2021

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“…The photons were detected by use of two fiber-coupled superconducting nanowire singlephoton detector (SNSPD) channels connected to a timetagging module (TTM). From its time stamps, our com-puter software calculated g (2) correlations between the channels, from which we identify the entangled photon pairs.…”

Section: Resultsmentioning

confidence: 99%

“…These points are getting ever more important for achieving non-vanishing key rates over fiber and free-space quantum links which are governed by unavoidable strong losses. In order to achieve this, different source designs have achieved remarkable individual figures of merit: Atzeni et al [1] achieved 2.2 × 10 9 cps/mW overall brightness and Sun et al [2] 1.2 × 10 9 cps/mW/nm spectral brightness, both in waveguide configurations. Liu et al [3] reported an average collection efficiency of 84.1% , Kaiser et al [4] as well as Joshi [5] showed 99.8% polarization visibility and the source of Tang et al [6] even survived a rocket explosion.…”

Section: Introductionmentioning

confidence: 99%

Experimental entanglement generation for quantum key distribution beyond 1 Gbit/s

Neumann¹,

Selimovic²,

Bohmann³

et al. 2021

Preprint

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Top-performance sources of photonic entanglement are an indispensable resource for many applications in quantum communication, most notably quantum key distribution. However, up to now, no source has been shown to simultaneously exhibit the high pair-creation rate, broad bandwidth, excellent state fidelity, and low intrinsic loss necessary for gigabit secure key rates. In this work, we present for the first time a source of polarization-entangled photon pairs at telecommunication wavelengths that covers all these needs of real-world quantum-cryptographic applications, thus enabling unprecedented quantum-secure key rates of more than 1 Gbit/s. Our source is designed to optimally exploit state-of-the-art telecommunication equipment and detection systems. Any technological improvement of the latter would result in an even higher rate without modification of the source. We discuss the used wavelength-multiplexing approach, including its potential for multiuser quantum networks and its fundamental limitations. Our source paves the way for high-speed quantum encryption approaching present-day internet bandwidth.

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“…In the future, it is promising to explore more LN crystals doped with different chemical elements and with different doping ratios. Another promising direction is investigating the spectrally pure single-photon state generation from doped PPLN waveguide [59][60][61] or doped PPLN film [62], which has the merits of higher nonlinear efficiency, easier for integration and microminiaturization. In Fig.…”

Section: Discussionmentioning

confidence: 99%

Mid-infrared spectrally-uncorrelated biphotons generation from doped PPLN: a theoretical investigation

Wei,

Cai,

Ding

et al. 2020

Preprint

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We theoretically investigate the preparation of mid-infrared (MIR) spectrally-uncorrelated biphotons from a spontaneous parametric down-conversion process using doped LN crystals, including MgO doped LN, ZnO doped LN, and In2O3 doped ZnLN with doping ratio from 0 to 7 mol%. The tilt angle of the phase-matching function and the corresponding poling period are calculated under type-II, type-I, and type-0 phase-matching conditions. We also calculate the thermal properties of the doped LN crystals and their performance in Hong-Ou-Mandel interference. It is found that the doping ratio has a substantial impact on the group-velocity-matching (GVM) wavelengths. Especially, the GVM2 wavelength of co-doped InZnLN crystal has a tunable range of 678.7 nm, which is much broader than the tunable range of less than 100 nm achieved by the conventional method of adjusting the temperature. It can be concluded that the doping ratio can be utilized as a degree of freedom to manipulate the biphoton state. The spectrally uncorrelated biphotons can be used to prepare pure single-photon source and entangled photon source, which may have promising applications for quantum-enhanced sensing, imaging, and communications at the MIR range.

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Compact polarization-entangled photon-pair source based on a dual-periodically-poled Ti:LiNbO₃ waveguide

Cited by 26 publications

References 34 publications

Ultrabright Multiplexed Energy-Time-Entangled Photon Generation from Lithium Niobate on Insulator Chip

Ultrabright Multiplexed Energy-Time-Entangled Photon Generation from Lithium Niobate on Insulator Chip

Experimental entanglement generation for quantum key distribution beyond 1 Gbit/s

Mid-infrared spectrally-uncorrelated biphotons generation from doped PPLN: a theoretical investigation

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Compact polarization-entangled photon-pair source based on a dual-periodically-poled Ti:LiNbO3 waveguide

Cited by 26 publications

References 34 publications

Ultrabright Multiplexed Energy-Time-Entangled Photon Generation from Lithium Niobate on Insulator Chip

Ultrabright Multiplexed Energy-Time-Entangled Photon Generation from Lithium Niobate on Insulator Chip

Experimental entanglement generation for quantum key distribution beyond 1 Gbit/s

Mid-infrared spectrally-uncorrelated biphotons generation from doped PPLN: a theoretical investigation

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Compact polarization-entangled photon-pair source based on a dual-periodically-poled Ti:LiNbO₃ waveguide