Measurement protection in prepare-and-measure quantum key distribution

Joonwoo Bae

doi:10.1117/12.2566250

20 August 2020 Measurement protection in prepare-and-measure quantum key distribution

Joonwoo Bae

Proceedings Volume 11507, Quantum Communications and Quantum Imaging XVIII; 1150708 (2020) https://doi.org/10.1117/12.2566250
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

In the distribution of quantum states over a long distance, not only are quantum states corrupted by interactions with an environment but also a measurement setting should be re-aligned such that detection events can be ensured for the resulting states. We here present a method of protecting a measurement in quantum key distribution against the interactions quantum states experience during the transmission, without the verification of a channel. As a result, a receiver does not have to revise the measurement that has been prepared in a noiseless scenario since it would remain ever optimal. The measurement protection is achieved by applications of local unitary transformations before and after the transmission, that leads to a supermap transforming an arbitrary channel to a depolarization one. An experimental demonstration is presented with the polarization encoding on photonic qubits. It is shown that the security bounds for prepare-and-measure protocols can be improved.

Conference Presentation

Citation Download Citation

Joonwoo Bae "Measurement protection in prepare-and-measure quantum key distribution", Proc. SPIE 11507, Quantum Communications and Quantum Imaging XVIII, 1150708 (20 August 2020); https://doi.org/10.1117/12.2566250

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