Discrete phase space and minimum-uncertainty states
arXiv:0704.1277
Abstract
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.
Submitted to the proceedings of QCMC06
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