*Speaker: *Carlo Ottaviani (University of York)
*Time: *Monday, July 23rd 2018 4-5pm
*Location: *Haus Room (36-428)
*Title:* Measurement device independent quantum key distribution: from
first design to high-rate modular network for quantum conferencing.
*Abstract:*
In continuous-variable (CV) measurement-device-independent (MDI) quantum
key-distribution (QKD) each party sends modulated coherent state to an
intermediate untrusted station (a relay) that, performing a Bell detection,
establishes secret correlation between the parties, allowing them to share
the secret-key. In this talk we review CV MDI-QKD, from the first design
and experimental test toward the latest development. In particular, we
discuss recent advancements about finite-size/composable security, the
generalization to an arbitrary number of users arranged in a star-network
configuration, and the design of a modular architecture based on
star-network module. Our modular (*lego-like*) protocol resorts to a hybrid
architecture where, once quantum-keys are generated for the users of each
module, the shortest one can be propagated to all others users by means of
iterative instances of classical one-time pad protocol. We show that our
modular design may allow high-rate distribution of quantum conferencing
keys among an arbitrary number of users and over arbitrary distances.
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