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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