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Unconditionally Secure Commitment of a Certified Classical Bit is Impossible
Adrian Kent
In a secure bit commitment protocol involving only classical physics, A commits either a 0 or a 1 to B. If quantum information is used in the protocol, A may be able to commit a st…
Cheat Sensitive Quantum Bit Commitment
Lucien Hardy, Adrian Kent
We define cheat sensitive cryptographic protocols between mistrustful parties as protocols which guarantee that, if either cheats, the other has some nonzero probability of detecti…
Non-local Correlations are Generic in Infinite-Dimensional Bipartite Systems
Rob Clifton, Hans Halvorson, Adrian Kent
It was recently shown that the nonseparable density operators for a bipartite system are trace norm dense if either factor space has infinite dimension. We show here that non-local…
Simulating Quantum Mechanics by Non-Contextual Hidden Variables
Rob Clifton, Adrian Kent
No physical measurement can be performed with infinite precision. This leaves a loophole in the standard no-go arguments against non-contextual hidden variables. All such arguments…
Secure Classical Bit Commitment using Fixed Capacity Communication Channels
Adrian Kent
If mutually mistrustful parties A and B control two or more appropriately located sites, special relativity can be used to guarantee that a pair of messages exchanged by A and B ar…
Non-Contextual Hidden Variables and Physical Measurements
Adrian Kent
For a hidden variable theory to be indistinguishable from quantum theory for finite precision measurements, it is enough that its predictions agree for some measurement within the…