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Conference on Lasers and Electro-Optics

Telecom Narrow Bandwidth Two-photon Source with High Fidelity Polarization Entanglement

Kazuya Niizeki, Daisuke Yoshida, Ming-Yang Zheng, Xiu-Ping Xie, Kotaro Okamura, Nobuyuki Takei, Tomoyuki Horikiri

Published Jan 1, 2019• 0 citations
Publisher

Abstract

We demonstrate two-photon sources for long-distance quantum communication. The highest spectral brightness 3.94×105 pairs/(s MHz mW), the narrowest linewidth in telecom of 1.06 MHz and entanglement fidelity of 91.8% are shown.
DOI
10.1364/cleo_qels.2019.fth1d.7

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We demonstrate two-photon sources for long-distance quantum communication. The highest spectral brightness 3.94×105pairs/(sMHzmW)3.94\times 10^{5}\mathrm{pairs}/(\mathrm{s} \mathrm{ MHz} \mathrm{mW})3.94×105pairs/(sMHzmW) , the narrowest linewidth in telecom of 1.06 MHz and entanglement fidelity of91.8% are shown. © 2019 The Author(s)
We demonstrate an ultrabright narrow-band two-photon source at the 1.5 µm telecom wavelength for long-distance quantum communication. By utilizing a bow-tie cavity, we obtain a cavity enhancement factor of 4.06 × 10 4 . Our measurement of the second-order correlation function G (2) (τ) reveals that the linewidth of 2.4 MHz has been hitherto unachieved in the 1.5 µm telecom band. This two-photon source is useful for obtaining a high absorption probability close to unity by quantum memories set inside quantum repeater nodes. Furthermore, to the best of our knowledge, the observed spectral brightness of 3.94 × 10 5 pairs/(s·MHz·mW) is also the highest reported over all wavelengths.
We report the realization of a new polarization entangled photon-pair source based on a titanium-indiffused waveguide integrated on periodically poled lithium niobate pumped by a CW laser at 655 nm. The paired photons are emitted at the telecom wavelength of 1310 nm within a bandwidth of 0.7 nm. The quantum properties of the pairs are measured using a two-photon coalescence experiment showing a visibility of 85%. The evaluated source brightness, on the order of 10(5) pairs s(-1)GHz(-1)mW(-1), associated with its compactness and reliability, demonstrates the source's high potential for long-distance quantum communication.
This paper reports a novel single mode source of narrow-band entangled photon pairs at telecom wavelengths under continuous wave excitation, based on parametric down conversion. For only 7 mW of pump power it has a created spectral radiance of 0.08 pairs per coherence length and a bandwidth of 10 pm (1.2 GHz). The effectively emitted spectral brightness reaches 3.9*10^5 pairs /(s pm). Furthermore, when combined with low jitter single photon detectors, such sources allow for the implementation of quantum communication protocols without any active synchronization or path length stabilization. A HOM-Dip with photons from two autonomous CW sources has been realized demonstrating the setup's stability and performance.
We demonstrate a compact and stable source of polarization-entangled pairs of photons, one at 810 nm wavelength for high detection efficiency and the other at 1550 nm for long-distance fiber communication networks. Due to a novel Sagnac-based design of the interferometer no active stabilization is needed. Using only one 30 mm ppKTP bulk crystal the source produces photons with a spectral brightness of 1.13 x 10(6) pairs/s/mW/THz with an entanglement fidelity of 98.2%. Both photons are single-mode fiber coupled and ready to be used in quantum key distribution (QKD) or transmission of photonic quantum states over large distances.