Continuous variable measurement device independent quantum conferencing with postselection

Continuous variable measurement device independent quantum conferencing with postselection

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Abstract A continuous variable (CV), measurement device independent (MDI) quantum key distribution (QKD) protocol is analyzed, enabling three parties to connect for quantum conferencing.We utilise a generalised Bell detection at an untrusted relay and a postselection procedure, in which distant parties reconcile Hand and feet set on the signs of the displacements of the quadratures of their prepared coherent states.We derive the rate of the protocol under a collective pure-loss attack, demonstrating improved rate-distance performance compared to the equivalent non-post-selected protocol.In the symmetric configuration in which all the parties lie the same distance from the relay, we find a positive key rate over 6 km.

Such postselection techniques can be used to improve the rate of multi-party quantum conferencing protocols at longer distances at the cost of Ski de fond - Homme - Skis - Back country reduced performance at shorter distances.