Displaying items by tag: Quantum communication

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Entanglement-based quantum repeaters aim to extend the range of quantum-communication. Typically, entanglement-based quantum repeaters apply a (nested) combination of entanglement swapping and distillation to create high fidelity entangled pairs over longer distances, with polynomially growing local resources and moderate rates. In this paper, Zwerger et al. introduce an alternative type of quantum repeater employing hashing, a deterministic entanglement distillation protocol with one-way communication, and show that this high-fidelity scheme is scalable  to arbitrary distances, with constant overhead in resources per repeater station, and ultrahigh rates. 

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Qu&Co comments on this publication:

Commercially available hardware exists for Quantum Key Distribution (QKD) up-to a range of ~100 km. Range extension is being targeted using different approaches based on ground and satellite based trusted-nodes or quantum-repeaters. In this paper Liao et al. show experimental results of quantum key distribution between a low-Earth-orbit satellite and multiple ground stations located in China and Europe. A secret key is created between China and Europe at locations separated by 7600 km on Earth with ~kHz rate per passage of the satellite Micius over a ground station.

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