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

[Gus Gutoski]

Reminder: PIQuDos seminar by Debbie Leung tomorrow at 16:00 in the Time
room.  -Gus


On Wed, Mar 5, 2014 at 4:29 PM, Gus Gutoski
<ggutoski at perimeterinstitute.ca>wrote:

> 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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