Regensburg 2022 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 7: Quantum Communication and Networks

QI 7.6: Vortrag

Mittwoch, 7. September 2022, 16:15–16:30, H8

Restoring quantum communication efficiency over high loss optical fibres — •Francesco Anna Mele — Scuola Normale Superiore, Pisa, Italy

In the absence of quantum repeaters, quantum communication proved to be nearly impossible across optical fibres longer than approximately 20 km due to the drop of transmissivity below the critical threshold of 1/2. However, if the signals fed into the fibre are separated by a sufficiently short time interval, memory effects must be taken into account. In this talk we show that by properly accounting for these effects it is possible to devise schemes that enable unassisted quantum communication across arbitrarily long optical fibres at a fixed positive qubit transmission rate. We also demonstrate how to achieve entanglement-assisted communication over arbitrarily long distances at a rate of the same order of the maximum achievable in the unassisted noiseless case.

This talk is based on https://arxiv.org/abs/2204.13128 and https://arxiv.org/abs/2204.13129 .