Picosecond synchronization system for quantum networks

• URL: http://arxiv.org/abs/2203.03127v1
• Date: Mon, 7 Mar 2022 04:38:28 GMT
• Title: Picosecond synchronization system for quantum networks
• Authors: Raju Valivarthi, Lautaro Narv\'aez, Samantha I. Davis, Nikolai Lauk, Cristi\'an Pe\~na, Si Xie, Jason P. Allmaras, Andrew D. Beyer, Boris Korzh, Andrew Mueller, Mandy Rominsky, Matthew Shaw, Emma E. Wollman, Panagiotis Spentzouris, Daniel Oblak, Neil Sinclair and Maria Spiropulu
• Abstract summary: We demonstrate a 200 MHz clock-rate fiber optic-based quantum network using off-the-shelf components combined with custom-made electronics and telecommunication C-band photons. Our demonstration sheds light on the role of noise in quantum communication and represents a key step in realizing co-existing classical-quantum networks.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The operation of long-distance quantum networks requires photons to be synchronized and must account for length variations of quantum channels. We demonstrate a 200 MHz clock-rate fiber optic-based quantum network using off-the-shelf components combined with custom-made electronics and telecommunication C-band photons. The network is backed by a scalable and fully automated synchronization system with ps-scale timing resolution. Synchronization of the photons is achieved by distributing O-band-wavelength laser pulses between network nodes. Specifically, we distribute photon pairs between three nodes, and measure a reduction of coincidence-to-accidental ratio from 77 to only 42 when the synchronization system is enabled, which permits high-fidelity qubit transmission. Our demonstration sheds light on the role of noise in quantum communication and represents a key step in realizing deployed co-existing classical-quantum networks.

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