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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 ...
Metallic quantum critical points with finite BCS couplings
(American Physical Society, 2015-11-02)
We study the fate of superconductivity in the vicinity of a class of metallic quantum critical points obtained by coupling a Fermi surface to a critical boson. In such systems there is a competition between the enhanced ...
Comment on "modified quantum-speed-limit bounds for open quantum dynamics in quantum channels"
(American Physical Society, 2018-04)
In a recent paper [Phys. Rev. A 95, 052118 (2017)2469-992610.1103/PhysRevA.95.052118], the authors claim that our criticism, in Phys. Rev. A 94, 052125 (2016)2469-992610.1103/PhysRevA.94.052125, to some quantum speed limit ...
Quantum discord and related measures of quantum correlations in finite XY chains
(World Scientific, 2013-05)
We examine the quantum correlations of spin pairs in the ground state of finite XY chains in a transverse field, by evaluating the quantum discord as well as other related entropic measures of quantum correlations. A brief ...
Local approximation to the critical parameters of quantum wells
(Elsevier, 2013-07-12)
We calculate the critical parameters for some simple quantum wells by means of the Riccati–Padé method. The original approach converges reasonably well for nonzero angular-momentum quantum number l but rather too slowly ...
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 ...
Decoherence scaling transition in the dynamics of quantum information scrambling
(American Physical Society, 2021-07)
Reliable processing of quantum information for developing quantum technologies requires precise control of out-of-equilibrium many-body systems. This is a highly challenging task because the fragility of quantum states to ...
Inducing critical phenomena in spin chains through sparse alternating fields
(American Physical Society, 2019-01-09)
We analyze the phase diagram of the exact ground state (GS) of spin-s chains with ferromagnetic XXZ couplings under n-alternating field configurations, i.e., sparse alternating fields having nodes at n − 1 contiguous sites. ...
Dissipative majorana quantum wires
(Elsevier, 2019-11)
In this paper, we formulate and quantitatively examine the effect of dissipation on topological systems. We use a specific model of Kitaev quantum wire with an onsite Ohmic dissipation and perform a numerically exact method ...
Criticality of environmental information obtainable by dynamically controlled quantum probes
(American Physical Society, 2016-10-21)
A universal approach to decoherence control combined with quantum estimation theory reveals a critical behavior, akin to a phase transition, of the information obtainable by a qubit probe concerning the memory time of ...