Good afternoon,
Tomorrow's seminar talk will be given by Frederic Dupuis:
Tuesday, Sept. 28, 17:00 in HIT J 52 (J floor!) on Hoenggerberg.
Best regards,
Stefan
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Title: Locking classical correlations into quantum states
Abstract: I will show that it is possible to encode a classical message
into a quantum state
such that, by removing a subsystem of logarithmic size with respect to
its total size, no
measurement can have significant correlations with the message. The
message is therefore
"locked" by a key of logarithmic size. I will then show that this has
important consequences
for security definitions of quantum protocols: if one does not take into
account that the
adversary can have a quantum memory, this effect can make a "secure"
protocol much
less secure than one would want.
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