We build a network source of indistinguishable photons, synchronized to an external clock, that could be used as scalable modular unit in an extended quantum network infrastructure. We characterize the indistinguishability and synchronization of this source. The Hong-Ou-Mandel dip shows near unity indistinguishability. Allan deviation analysis shows sub-picosecond jitter when locked to an external clock. The jitter figure is more than 10 times smaller than the pulse duration of 30ps. The source is compatible with many clock recovery systems, including the White Rabbit Precision Time Protocol (WR-PTP). This source enables scalable quantum protocols over multi-node, long-distance optical networks.
Practical quantum networks require transform-limited single photon sources that can be synchronized with high timing accuracy over long distances. We build a source of heralded single photons at telecom C-band using a Ti-Sapphire mode locked laser that can be synchronized to an external frequency reference. We target 10 ps single photon pulses so that the independent sources should be carrier frequency matched to within 10 GHz and experience ~3 ps shot-to-shot jitter to independently produce indistinguishable photons. In this progress report, we demonstrate the picosecond single-photon source and discuss high-accuracy precision time protocol (HA-PTP) and pulsed laser-based network synchronization options.
We investigate the coexistence of clock synchronization protocols with quantum signals propagating in a common optical single-mode fiber channel. By measuring optical forward and backward scattering noise in a range from 1510 nm to 1620 nm we demonstrate a potential for up to 100 quantum channels each with 100 GHz bandwidth coexisting with the classical synchronization signals using off-the-shelf optical components. Both “White Rabbit'' and a pulsed laser-based synchronization were characterized and compared.
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