0000000000946205

AUTHOR

Abolfazl Bayat

showing 2 related works from this author

Nonequilibrium critical scaling in quantum thermodynamics

2016

The emerging field of quantum thermodynamics is contributing important results and insights into archetypal many-body problems, including quantum phase transitions. Still, the question whether out-of-equilibrium quantities, such as fluctuations of work, exhibit critical scaling after a sudden quench in a closed system has remained elusive. Here, we take a novel approach to the problem by studying a quench across an impurity quantum critical point. By performing density matrix renormalization group computations on the two-impurity Kondo model, we are able to establish that the irreversible work produced in a quench exhibits finite-size scaling at quantum criticality. This scaling faithfully …

Quantum phase transitionFOS: Physical sciencesNon-equilibrium thermodynamics02 engineering and technology01 natural sciencesCondensed Matter - Strongly Correlated Electronsquant-phCritical point (thermodynamics)Quantum critical pointQuantum mechanics0103 physical sciencesStatistical physicscond-mat.stat-mech010306 general physicsQuantum thermodynamicsCondensed Matter - Statistical MechanicsPhysicsQuantum PhysicsStatistical Mechanics (cond-mat.stat-mech)Strongly Correlated Electrons (cond-mat.str-el)Density matrix renormalization group021001 nanoscience & nanotechnology2-IMPURITY KONDO PROBLEM; MATRIX RENORMALIZATION-GROUP; JARZYNSKI EQUALITY; CRITICAL-POINT; SYSTEMS; MODELcond-mat.str-elQuantum Physics (quant-ph)0210 nano-technologyKondo modelCritical exponentPhysical Review B
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Entanglement amplification in the nonperturbative dynamics of modular quantum systems

2013

We analyze the conditions for entanglement amplification between distant and not directly interacting quantum objects by their common coupling to media with static modular structure and subject to a local (single-bond) quenched dynamics. We show that in the non-perturbative regime of the dynamics the initial end-to-end entanglement is strongly amplified and, moreover, can be distributed efficiently between distant objects. Due to its intrinsic local and non-perturbative nature the dynamics is fast and robust against thermal fluctuations, and its control is undemanding. We show that the origin of entanglement amplification lies in the interference of the ground state and at most one of the l…

PhysicsQuantum PhysicsFOS: Physical sciencesQuantum entanglementSquashed entanglement01 natural sciencesAtomic and Molecular Physics and Optics010305 fluids & plasmassymbols.namesakeQubitQuantum mechanics0103 physical sciencessymbolsSpectral gap010306 general physicsQuantum information scienceHamiltonian (quantum mechanics)Quantum Physics (quant-ph)entanglementQuantumEigenvalues and eigenvectors
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