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Dynamical phase transitions and Loschmidt echo in the infinite-range XY model
(Royal Soc, 2016)
We compare two different notions of dynamical phase transitions in closed quantum systems. The first is identified through the time-averaged value of the equilibrium-order parameter, whereas the second corresponds to ...
Loschmidt echo and time reversal in complex systems
(The Royal Society, 2016-05)
Goussev A, Jalabert RA, Pastawski HM,Wisniacki DA. 2016 <br />Loschmidt echo and time reversal in complex systems.<br />Phil. Trans. R. Soc. A 374: 20150383. <br />http://dx.doi.org/10.1098/rsta.2015.0383<br />Echoes are ...
Gamow vectors formalism applied to the Loschmidt echo
(Springer Verlag Berlín, 2020-09)
Gamow vectors have been developed in order to give a mathematical description for quantum decay phenomena. Mainly, they have been applied to radioactive phenomena, scattering and to some decoherence models. They play a ...
Decoherence and the loschmidt echo
(American Physical Society, 2003-11)
Decoherence causes entropy increase that can be quantified using, e.g., the purity [Formula presented]. When the Hamiltonian of a quantum system is perturbed, its sensitivity to such perturbation can be measured by the ...
Interaction-disorder competition in a spin system evaluated through the Loschmidt echo
(American Physical Society, 2013-11)
The interplay between interactions and disorder in closed quantum many-body systems is relevant for thermalization phenomenon. In this paper, we address this competition in an infinite temperature spin system by means of ...
Loschmidt echo and the local density of states
(American Physical Society, 2009-10)
Loschmidt echo (LE) is a measure of reversibility and sensitivity to perturbations of quantum evolutions. For weak perturbations its decay rate is given by the width of the local density of states (LDOS). When the perturbation ...
Fragility of superposition states evaluated by the Loschmidt echo
(American Physical Society, 2013-09)
We consider the degradation of the dynamics of a Gaussian wave packet in a harmonic oscillator under the presence of an environment. This last is given by a single nondegenerate two-level system. We analyze how the binary ...
Experimental quantification of decoherence via the Loschmidt echo in a many spin system with scaled dipolar Hamiltonians
(2015)
We performed Loschmidt echo nuclear magnetic resonance experiments to study decoherence under a scaled dipolar Hamiltonian by means of a symmetrical time-reversal pulse sequence denominated Proportionally Refocused Loschmidt ...
Loschmidt echo in many-spin systems: A quest for intrinsic decoherence and emergent irreversibility
(IOP Publishing, 2017-02-13)
If a magnetic polarization excess is locally injected in a crystal of interacting spins in thermal equilibrium, this 'excitation' would spread as consequence of spin-spin interactions. Such an apparently irreversible process ...