Abstract
We demonstrate a two-channel, upconversion detector for counting 1300-nm-wavelength photons. By using two pumps near 1550 nm, photons near 1300 nm are converted to two spectrally distinct channels near 710 nm using sum-frequency generation (SFG) in a periodically poled LiNbO3 (PPLN) waveguide. We used spectral-conversion engineering to design the phase-modulated PPLN waveguide for simultaneous quasi-phasematching of two SFG processes. The two channels exhibit 31% and 25% full-system photon detection efficiency, and very low dark count rates (650 and 550 counts per second at a peak external conversion efficiency of 70%) through filtering using a volume Bragg grating. We investigate applications of the dual-channel upconversion detector as a frequency-shifting beamsplitter, and as a time-to-frequency converter to enable higher-data-rate quantum communications.
Highlights
Single-photon upconversion detectors for counting 1.3- and 1.5- m-wavelength photons are attractive alternatives to direct detection by either InGaAs avalanche photodiodes (APDs) or superconducting single-photon detectors (SSPDs)
Upconversion detection is based on highly efficient sum-frequency generation (SFG) that converts near-infrared photons to shorter-wavelength photons that can be detected by Si APDs, which offer higher detection efficiencies and lower dark count rates than their InGaAs-based counterparts [1,2,3,4,5]
We have demonstrated a dual-wavelength, high-efficiency upconversion single-photon detector with extremely low dark count rates
Summary
Single-photon upconversion detectors for counting 1.3- and 1.5- m-wavelength photons are attractive alternatives to direct detection by either InGaAs avalanche photodiodes (APDs) or superconducting single-photon detectors (SSPDs). Upconversion detection is based on highly efficient sum-frequency generation (SFG) that converts near-infrared photons to shorter-wavelength photons that can be detected by Si APDs, which offer higher detection efficiencies and lower dark count rates than their InGaAs-based counterparts [1,2,3,4,5]. SSPDs can be used to detect near-infrared photons with very good sensitivity and dark count rates [6,7,8,9], but they require cryogenic operating temperatures, and are of limited utility in practical quantum communications systems. We show ultra-low dark count rates (
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
