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10 papers · 2 filters
Gaussian Decoherence from Random Spin Environments
W. H. Zurek, F. M. Cucchietti, J. P. Paz
We examine an exactly solvable model of decoherence - a spin-system interacting with a collection of environment spins. We show that in this model (introduced some time ago to illu…
Quantum algorithms for phase space tomography
Juan Pablo Paz, Augusto J. Roncaglia, Marcos Saraceno
We present efficient circuits that can be used for the phase space tomography of quantum states. The circuits evaluate individual values or selected averages of the Wigner, Kirkwoo…
Dynamics of quantum trajectories in chaotic systems
D. A. Wisniacki, F. Borondo, R. M. Benito
Quantum trajectories defined in the de Broglie--Bohm theory provide a causal way to interpret physical phenomena. In this Letter, we use this formalism to analyze the short time dy…
Phase-space approach to the study of decoherence in quantum walks
C. C. Lopez, J. P. Paz
We analyze the quantum walk on a cycle using discrete Wigner functions as a way to represent the states and the evolution of the walker. The method provides some insight on the nat…
Decoherence and recoherence from vacuum fluctuations near a conducting plate
Francisco D. Mazzitelli, Juan Pablo Paz, Alejandro Villanueva
The interaction between particles and the electromagnetic field induces decoherence generating a small suppression of fringes in an interference experiment. We show that if a doubl…
A quantum gate array can be programmed to evaluate the expectation value of any operator
Juan Pablo Paz, Augusto Roncaglia
A programmable gate array is a circuit whose action is controlled by input data. In this letter we describe a special--purpose quantum circuit that can be programmed to evaluate th…