[QIP-Sem] MIT Quantum Information Processing Seminar Announcement

[QIP-Sem Mailing List]

There will be no MIT QIP Seminar today (Monday March 14); today's 
Applied Mathematics Colloquium starting at 16:15 in room 4-231 should 
however be a very good substitute:


Assisted Capacities of Quantum Channels

by Charles H. Bennett (IBM Research, Yorktown Heights)

ABSTRACT

Any process whereby a quantum system passes from a sender to a 
receiver, possibly interacting  with some environment en route, may 
be regarded as a quantum channel.  Unlike their classical  analogs, 
quantum channels have multiple capacities depending on what one is 
trying to use them  for (e.g. classical or quantum communication) and 
what auxiliary resources are brought into  play.  I review these 
capacities and the progress in associating them with simple entropic 
expressions such as Holevo information and quantum mutual 
information.  Among auxiliary  resources, sender-receiver 
entanglement has a simplifying effect: in its presence all quantum 
channels become efficiently interconvertible (quantum reverse Shannon 
theorem).  By contrast,  classical feedback, or source-independent 
bidirectional classical side communication, which  have no effect on 
a classical channel's single capacity, have a complicated effect on 
quantum  channels, sometimes increasing both their quantum and 
capacities to values between the  unassisted and the 
entanglement-assisted values.  Joint work with Peter Shor, Igor 
Devetak, John  Smolin and Andreas Winter.


Next week: MIT Spring Break.
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