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IQUIST Seminar: Felix Leditzky "Symmetries and asymptotics of port-based teleportation"

Event Type
Seminar/Symposium
Sponsor
IQUIST and Department of Physics
Location
280 MRL
Date
Sep 25, 2019   1:00 pm  
Speaker
Felix Leditzky, JILA, University of Colorado-Boulder
Contact
Betsy Greifenkamp
E-Mail
greifenk@illinois.edu
Phone
217-333-3022
Views
108
Originating Calendar
IQUIST Seminar Series

Quantum teleportation is one of the fundamental building blocks of quantum Shannon theory. The original teleportation protocol is an exact protocol and amazingly simple, but it requires a non-trivial correction operation to make it work. Port-based teleportation (PBT) is an approximate variant of teleportation with a simple correction operation that renders the protocol unitarily covariant. This property enables applications such as universal programmable quantum processors, instantaneous non-local quantum computation and attacks on position-based quantum cryptography. The natural symmetries of PBT allow for an elegant mathematical description of optimal protocols in representation-theoretic terms. I will explain these symmetries and show how to use Schur-Weyl duality to describe the asymptotics of optimal port-based teleportation protocols.


This talk is based on arXiv:1809.10751, joint work with M. Christandl, C. Majenz, G. Smith, F. Speelman, and M. Walter.

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