Discrete phase space and minimum-uncertainty states

Details Discrete phase space and minimum-uncertainty states Discrete phase space and minimum-uncertainty states

2007-04-10

arxiv.org/abs/0704.1277v1

Physics

Quantum Physics

Submitted to the proceedings of QCMC06

Scientific paper

The quantum state of a system of qubits can be represented by a Wigner function on a discrete phase space, each axis of the phase space taking values in a finite field. Within this framework, we show that one can make sense of the notion of a "rotationally invariant state" of any collection of qubits, and that any such state is, in a well defined sense, a state of minimum uncertainty.

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