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artículo con referato
"Discrete Wigner Functions and the Phase Space Representation of Quantum Computers"
P. Bianucci, C. Miquel, J.P. Paz and M. Saraceno
Phys. Lett. A 297(5-6) (2002) 353-358
We show how to represent the state and the evolution of a quantum computer (or any system with an N-dimensional Hilbert space) in phase space. For this purpose we use a discrete version of the Wigner function which, for arbitrary N, is defined in a phase space grid of 2N×2N points. We compute such Wigner function for states which are relevant for quantum computation. Finally, we discuss properties of quantum algorithms in phase space and present the phase space representation of Grover's quantum search algorithm.
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