"Quantum Entanglement as a Resource for Communication"William Wootters , Williams College [Host: Olivier Pfister]
ABSTRACT:
Quantum mechanical objects can exhibit correlations with one another
that
are fundamentally at odds with the paradigm of classical physics; one
says
that the objects are "entangled." In the past few years, entanglement
has
come to be studied not only as a marvel of nature but also as a
potential
resource, particularly as a resource for certain unusual kinds of
communication. This talk reviews three proposed communication schemes
based on entanglement: (i) dense coding, which is the effective doubling
of
the information-carrying capacity of a quantum particle through prior
entanglement with a particle at the receiving end; (ii) teleportation,
in
which a quantum state is transferred from one particle to another over a
distance, apparently without traversing the intervening space; and (iii)
the efficient pooling of classical data, in which separated participants
arrive at a conclusion faster because they share entanglement. These
three
schemes highlight three distinct ways in which entanglement can enhance
communication.
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Colloquium Friday, March 23, 2001 4:00 PM Physics Building, Room 204 Note special time. Note special room. |
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