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Highly non-degenerate, heralded single photon source on a PPKTP-PIC integrated system

Vijay Soorya Shunmuga Sundaram, Evan Manfreda-Schulz, Venkatesh Deenadayalan, Todd Hawthorne, Bradley R. Slezak, Tony Roberts, Thomas Palone, Mario Ciminelli, Philip R. Battle, Gregory A. Howland, Stefan F. Preble

Published Jan 1, 2023• 0 citations
Publisher

Abstract

We present a novel, highly non-degenerate, heralded visible-telecom photon-pair source using an integrated system of nonlinear waveguides and photonic circuits. Thermo-optic modulation of the telecom single-photon-state is demonstrated for deployable quantum communication/networking systems.
DOI
10.1364/cleo_at.2023.jth2a.46

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We present a heralded photon-pair source using periodically poled potassium titanyl phosphate (PPKTP) waveguides coupled with photonic integrated circuits (PICs). The PPKTP generates correlated visible–telecom photon pairs, processed by the dual-band silicon and silicon nitride PIC. Heralding at visible wavelengths removes the need for large superconducting nanowire single-photon detectors (SNSPDs). Silicon Mach–Zehnder interferometers (MZIs) on the PIC modulate the telecom single photons and also serve as pump-rejection filters. We demonstrate an insertion loss of 2.37 ± 1.03 dB (4.46 ± 1.32 dB) at the visible (telecom) wavelength between the PPKTP waveguides and PIC edge couplers, and an on-chip pump suppression of 92.5 ± 2.5 dB. This platform will enable remote quantum nodes to securely communicate over telecom fiber-optic networks.
We report on a guided wave heralded photon source based on the creation of non-degenerate photon pairs by spontaneous parametric down conversion in a Periodically Poled Lithium Niobate waveguide. Using the signal photon at 1310 nm as a trigger, a gated detection process permits announcing the arrival of single photons at 1550 nm at the output of a single mode optical fiber with the best probability to date of 0.38. The multi-photon emission probability is reduced by a factor of 10 compared to poissonian light sources. Relying on guided wave technologies such as integrated optics and fiber optics components, our source offers stability, compactness and efficiency and can serve as a paradigm for guided wave devices applied to quantum communication and computation using existing telecom networks.
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We report a fibre-integrated heralded single-photon source based on a commercial Zn-indiffused MgO:PPLN ridge waveguide operated in Type-0 degenerate spontaneous parametric down-conversion (SPDC). The device emits a broadband spectrum spanning approximately 70 nm across the telecom C-and L-bands, with an absolute brightness of 9.1×1099.1\times 10^{9}9.1×109 pairs/(s mW). After accounting for optical losses, we determine an internal heralding efficiency of 58(5)%. The source maintains high purity, exhibiting a coincidences-to-accidentals ratio exceeding 9×1049\times 10^{4}9×104 and a heralded second-order correlation of gh(2)(0)=(5.53±0.46)×10−4g_{\text{h}}^{(2)}(0) = (5.53 \pm 0.46)\times 10^{-4}gh(2)​(0)=(5.53±0.46)×10−4. Low multi-photon noise and broadband emission demonstrate the viability of such platforms for wavelength-multiplexed quantum networking.