55 research outputs found
A Case for Quantum Memories in Space
It has recently been theoretically shown that Quantum Memories (QM) could enable truly
global quantum networking when deployed in space [1, 2] thereby surpassing the limited range
of land-based quantum repeaters. Furthermore, QM in space could enable novel protocols
and long-range entanglement and teleportation applications suitable for Deep-Space links and
extended scenarios for fundamental physics tests. In this white paper we will make the case
for the importance of deploying QMs to space, and also discuss the major technical milestones
and development stages that will need to be considere
Simulating quantum repeater strategies for multiple satellites
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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