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Universal decoherence induced by an environmental quantum phase transition
(American Physical Society, 2007-12)
Decoherence induced by coupling a system with an environment may display universal features. We demonstrate that when the coupling to the system drives a quantum phase transition in the environment, the decay of quantum ...
Interaction between different kinds of quantum phase transitions
(MDPI AG, 2021-06)
We employ two different Lipkin-like, exactly solvable models so as to display features of the competition between different fermion–fermion quantum interactions (at finite temperatures). One of our two interactions mimics ...
Closure of the entanglement gap at quantum criticality: The case of the quantum spherical model
(American Physical Society, 2020-12)
The study of entanglement spectra is a powerful tool to detect or elucidate universal behavior in quantum many-body systems. We investigate the scaling of the entanglement (or Schmidt) gap δξ , i.e., the lowest-laying gap ...
Scaling laws in the quantum-to-classical transition in chaotic systems
(American Physical Society, 2009-02)
We study the quantum-to-classical transition in a chaotic system surrounded by a diffusive environment. First, we analyze the emergence of classicality when it is monitored by the Renyi entropy, a measure of the entanglement ...
Environmentally induced quantum dynamical phase transition in the spin swapping operation
(American Institute of Physics, 2006-12)
Quantum information processing relies on coherent quantum dynamics for a precise control of its basic operations. A swapping gate in a two-spin system exchanges the degenerate states ∫↑, ↓〉 and ∫↓, ↑〉. In NMR, this is ...
Separability and parity transitions in XYZ spin systems under nonuniform fields
(American Physical Society, 2020-05)
We examine the existence of completely separable ground states (GS) in finite spin-s arrays with anisotropic XYZ couplings, immersed in a nonuniform magnetic field along one of the principal axes. The general conditions ...
Quantum coherence and criticality in irreversible work
(American Physical Society, 2020-08)
The irreversible work during a driving protocol constitutes one of the most widely studied measures in nonequilibrium thermodynamics, as it constitutes a proxy for entropy production. In quantum systems, it has been shown ...
Energy barriers between metastable states in first-order quantum phase transitions
(American Physical Society, 2018-02-05)
A system of neutral atoms trapped in an optical lattice and dispersively coupled to the field of an optical cavity can realize a variation of the Bose-Hubbard model with infinite-range interactions. This model exhibits a ...
Topological quantum phase transition between Fermi liquid phases in an Anderson impurity model
(American Physical Society, 2018-11)
We study a generalized Anderson model that mixes two localized configurations-one formed by two degenerate doublets and the other by a triplet with single-ion anisotropy DSz2-by means of two degenerate conduction channels. ...
Feasibility of the ion-trap simulation of a class of non-equilibrium phase transitions
(Springer, 2019-11)
Our work analyzes the potential of ion traps for the experimental simulation of non-equilibrium phase transitions observed in certain spin-chain models which can be mapped to free-fermion systems. In order to make the ...