Quantum cryptography with an ideal local relay

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We consider two remote parties connected to a relay by two quantum channels. To generate a secret key, they transmit coherent states to the relay, where the states are subject to a continuous-variable (CV) Bell detection. We study the ideal case where Alice's channel is lossless, i.e., the relay is locally in her lab and the Bell detection is perfomed with unit efficiency. This configuration allows us to explore the optimal performances achievable by CV measurement-device-independent quantum key distribution. This corresponds to the limit of a trusted local relay, where the detection loss can be re-scaled. Our theoretical analysis is confirmed by an experimental simulation where 10-4 secret bits per use can potentially be distributed at 170km assuming ideal reconciliation.
Original languageEnglish
Title of host publicationElectro-Optical and Infrared Systems: Technology and Applications XII; and Quantum Information Science and Technology
Number of pages4
Volume9648
PublisherSPIE - International Society for Optical Engineering
Publication date2015
DOIs
Publication statusPublished - 2015
EventElectro-Optical and Infrared Systems: Technology and Applications XII; and Quantum Information Science and Technology - Toulouse, France
Duration: 21 Sep 201521 Sep 2015

Conference

ConferenceElectro-Optical and Infrared Systems: Technology and Applications XII; and Quantum Information Science and Technology
CountryFrance
CityToulouse
Period21/09/201521/09/2015
SeriesProceedings of S P I E - International Society for Optical Engineering
ISSN0277-786X
CitationsWeb of Science® Times Cited: No match on DOI

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