Towards Satellite-Suited Noise-Free Quantum Memories

A global quantum repeater network involving satellite-based links is likely to have advantages over fiber-based networks in terms of long-distance communication, since the photon losses in vacuum scale only polynomially with the distance – compared to the exponential losses in optical fibers. To simulate the performance of such networks, we have introduced a scheme of large-scale event-based Monte Carlo simulation of quantum repeaters with multiple memories that can faithfully represent loss and imperfections in these memories. In this work, we identify the quantum key distribution rates achievable in various satellite and ground station geometries for feasible experimental parameters. The power and flexibility of the simulation toolbox allows us to explore various strategies and parameters, some of which only arise in these more complex, multi-satellite repeater scenarios. As a primary result, we conclude that key rates in the kHz range are reasonably attainable for intercontinental quantum communication with three satellites, only one of which carries a quantum memory.

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Simulating quantum repeater strategies for multiple satellites

Wallnöfer

Hahn

Gündoğan

et al. 2022

Commun Phys

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Towards Satellite-Suited Noise-Free Quantum Memories

Abstract: Quantum memories on satellites will allow to circumvent transmission losses in long-distance quantum communication. We demonstrate a warm Caesium vapour memory based on EIT with an unconditional noise floor of 1.2 · 10-3 due to collision-induced fluorescence.

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Simulating quantum repeater strategies for multiple satellites

Simulating quantum repeater strategies for multiple satellites

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