no code implementations • 12 Mar 2012 • Joel J. Wallman, Stephen D. Bartlett
We seek to determine what other sets of quantum states and measurements for a qubit can be non-negative in a quasiprobability representation, and to identify nontrivial unitary groups that permute the states in such a set.
Quantum Physics
no code implementations • 5 Oct 2006 • Stephen D. Bartlett, Terry Rudolph, Robert W. Spekkens
Recently, there has been much interest in a new kind of ``unspeakable'' quantum information that stands to regular quantum information in the same way that a direction in space or a moment in time stands to a classical bit string: the former can only be encoded using particular degrees of freedom while the latter are indifferent to the physical nature of the information carriers.
Quantum Physics
no code implementations • 1 Aug 2001 • Troy D. Mackay, Stephen D. Bartlett, Leigh T. Stephenson, Barry C. Sanders
We analyze the quantum walk in higher spatial dimensions and compare classical and quantum spreading as a function of time.
Quantum Physics
