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SUMMARY:Universal Blind Quantum Computation with Weak Coherent Pulses - Ve
 dran Dunjko (Heriot-Watt University)
DTSTART:20120524T131500Z
DTEND:20120524T141500Z
UID:TALK37179@talks.cam.ac.uk
CONTACT:Paul Skrzypczyk
DESCRIPTION:The Universal Blind Quantum Computation (UBQC) protocol allows
  a client to perform quantum computation on a remote server. In an ideal s
 etting\, perfect privacy is guaranteed if the client is capable of produci
 ng specific\, randomly chosen single qubit states.  While from a theoretic
 al point of view\, this may constitute the lowest possible quantum require
 ment\, from a pragmatic point of view\, generation of such states to be se
 nt along long distances can never be achieved perfectly.\n\nWe introduce t
 he concept of ε-blindness for UBQC\, in analogy to the concept of ε-secu
 rity developed for other cryptographic protocols\, allowing us to characte
 rize the robustness and security properties of the protocol under possible
  imperfections. We also present a remote blind single qubit preparation pr
 otocol with weak coherent pulses for the client to prepare\, in a delegate
 d fashion\, quantum states arbitrarily close to perfect random single qubi
 t states\, allowing us to efficiently achieve ε-blind UBQC for any ε >0\
 , even if the channel between the client and the server is arbitrarily los
 sy.\n\nTime permitting\, and conditional on the interests of the audience\
 , additional topics related to UBQC can also be discussed.
LOCATION:MR4\, Centre for Mathematical Sciences
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