[quantum-info] PIQuDos seminar on Wed Mar 12: Debbie Leung

[Gus Gutoski]

Please join us on Wednesday, March 12 at 4pm in the Time room for a quantum
information seminar by Debbie Leung.

Title:  *Maximal Privacy Without Coherence*
Speaker: *Debbie Leung* (IQC)

Abstract:  Privacy and coherence have long been considered closely related
properties of a quantum state.  Indeed, a coherently transmitted quantum
state is inherently private.  Surprisingly, coherent quantum communication
is not always required for privacy: there are quantum channels that are too
noisy to transmit quantum information but it can send private classical
information.  Here, we ask how different the private classical and the
quantum capacities can be.  We present a class of channels N_d with input
dimension d^2, quantum capacity Q(N_d) <= 1, and private classical capacity
P(N_d) = log d.  These channels asymptotically saturate an interesting
inequality P(N) <= (log d_A + Q(N))/2 for any channel N with input
dimension d_A, and capture the essence of privacy stripped of the
confounding influence of coherence.

Joint with with Ke Li, Graeme Smith, John Smolin from IBM.

Date: Wednesday, March 12, 2014.
Time: 16:00
Location: Time Room (294)

-Gus
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