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- Marko Žnidarič, Carlos Pineda, Ignacio García-Mata
- Physical review letters
- 2011

The channel induced by a complex system interacting strongly with a qubit is calculated exactly under the assumption of randomness of its eigenvectors. The resulting channel is represented as an isotropic time-dependent oscillation of the Bloch ball, leading to non-Markovian behavior, even in the limit of infinite environments. Two contributions are… (More)

- Ignacio García-Mata, Dima L Shepelyansky
- Physical review. E, Statistical, nonlinear, and…
- 2009

We study numerically the effects of nonlinearity on the Anderson localization in lattices with disorder in one and two dimensions. The obtained results show that at moderate strength of nonlinearity a spreading over the lattice in time takes place with an algebraic growth of number of populated sites Deltan proportional to tnu. This spreading continues up… (More)

- Ignacio García-Mata, Marcos Saraceno
- Physical review. E, Statistical, nonlinear, and…
- 2004

We study the relationship between the spectral properties of diffusive open quantum maps and the classical spectrum of Ruelle-Pollicott resonances. The leading resonances determine the asymptotic time regime for several quantities of interest--the linear entropy, the Loschmidt echo, and the correlations of the initial state. A numerical method that allows… (More)

- John Martin, Ignacio García-Mata, Olivier Giraud, Bertrand Georgeot
- Physical review. E, Statistical, nonlinear, and…
- 2010

We study numerically multifractal properties of two models of one-dimensional quantum maps: a map with pseudointegrable dynamics and intermediate spectral statistics and a map with an Anderson-like transition recently implemented with cold atoms. Using extensive numerical simulations, we compute the multifractal exponents of quantum wave functions and study… (More)

- Ignacio García-Mata, John Martin, Olivier Giraud, Bertrand Georgeot
- Physical review. E, Statistical, nonlinear, and…
- 2012

We study a version of the mathematical Ruijsenaars-Schneider model and reinterpret it physically in order to describe the spreading with time of quantum wave packets in a system where multifractality can be tuned by varying a parameter. We compare different methods to measure the multifractality of wave packets and identify the best one. We find the… (More)

- R Dubertrand, I García-Mata, B Georgeot, O Giraud, G Lemarié, J Martin
- Physical review letters
- 2014

We expose two scenarios for the breakdown of quantum multifractality under the effect of perturbations. In the first scenario, multifractality survives below a certain scale of the quantum fluctuations. In the other one, the fluctuations of the wave functions are changed at every scale and each multifractal dimension smoothly goes to the ergodic value. We… (More)

- Ignacio García-Mata, Marcos Saraceno, María Elena Spina
- Physical review letters
- 2003

The linear entropy and the Loschmidt echo have proved to be of interest recently in the context of quantum information and of the quantum to classical transitions. We study the asymptotic long-time behavior of these quantities for open quantum maps and relate the decays to the eigenvalues of a coarse-grained superoperator. In specific ranges of coarse… (More)

The legendary discussion between Einstein and Bohr concerning the photon box experiment is critically analyzed. It is shown that Einstein’s argument is flawed and Bohr’s reply is wrong.

- Ignacio García-Mata, Augusto J Roncaglia, Diego A Wisniacki
- Physical review. E, Statistical, nonlinear, and…
- 2015

In classical statistical mechanics there is a clear correlation between relaxation to equilibrium and chaos. In contrast, for isolated quantum systems this relation is--to say the least--fuzzy. In this work we try to unveil the intricate relation between the relaxation process and the transition from integrability to chaos. We study the approach to… (More)

- Ignacio García-Mata, Augusto J Roncaglia, Diego A Wisniacki
- Philosophical transactions. Series A…
- 2016

The Loschmidt echo--also known as fidelity--is a very useful tool to study irreversibility in quantum mechanics due to perturbations or imperfections. Many different regimes, as a function of time and strength of the perturbation, have been identified. For chaotic systems, there is a range of perturbation strengths where the decay of the Loschmidt echo is… (More)