Discrete coherent and squeezed states of many-qudit systems

Details Discrete coherent and squeezed states of many-qudit systems Discrete coherent and squeezed states of many-qudit systems

2009-07-22

arxiv.org/abs/0907.3845v1

Phys. Rev. A 80, 043836 (2009)

Physics

Quantum Physics

11 pages, 3 eps figures. Submitted for publication

Scientific paper

10.1103/PhysRevA.80.043836

We consider the phase space for a system of $n$ identical qudits (each one of dimension $d$, with $d$ a primer number) as a grid of $d^{n} \times d^{n}$ points and use the finite field $GF(d^{n})$ to label the corresponding axes. The associated displacement operators permit to define $s$-parametrized quasidistribution functions in this grid, with properties analogous to their continuous counterparts. These displacements allow also for the construction of finite coherent states, once a fiducial state is fixed. We take this reference as one eigenstate of the discrete Fourier transform and study the factorization properties of the resulting coherent states. We extend these ideas to include discrete squeezed states, and show their intriguing relation with entangled states between different qudits.

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