Discrete coherent and squeezed states of many-qudit systems

Abstract

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.

11 pages, 3 eps figures. Submitted for publication

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• Macroscopic features of quantum fluctuations in large N qubit system
• On the discrete Wigner function for SU(N)
• An improved bound for strong unitary uncertainty relations with refined sequence
• Tomography from collective measurements
• Quantum computation mediated by ancillary qudits and spin coherent states
• Discrete phase-space mappings, tomographic condition and permutation invariance
• Mixed discrete variable Gaussian states
• Minimum uncertainty states and completeness of non-negative quasi probability of finite-dimensional quantum systems
• Macroscopic approach to N-qudit systems