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A note on the optimality of decomposable entanglement witnesses and completely entangled subspaces
Remigiusz Augusiak, Jordi Tura, Maciej Lewenstein
Entanglement witnesses (EWs) constitute one of the most important entanglement detectors in quantum systems. Nevertheless, their complete characterization, in particular with respe…
Fermion- and spin-counting in strongly correlated systems in and out of thermal equilibrium
Sibylle Braungardt, Mirta Rodriguez, Aditi Sen De +3
Atom counting theory can be used to study the role of thermal noise in quantum phase transitions and to monitor the dynamics of a quantum system. We illustrate this for a strongly…
The ground state of binary systems with a periodic modulation of the linear coupling
Armand Niederberger, Boris A. Malomed, Maciej Lewenstein
We consider a quasi-one-dimensional two-component systm, described by a pair of Nonlinear Schrödinger/Gross-Pitaevskii Equations (NLSEs/GPEs), which are coupled by the linear mixin…
On structural physical approximations and entanglement breaking maps
Remigiusz Augusiak, Joonwoo Bae, Łukasz Czekaj +1
Very recently a conjecture saying that the so-called structural physical approximations (SPAa) to optimal positive maps (optimal entanglement witnesses) give entanglement breaking…
Disorder-Induced Order in Quantum XY Chains
Armand Niederberger, Marek M. Rams, Jacek Dziarmaga +3
We observe signatures of disorder-induced order in 1D XY spin chains with an external, site-dependent uni-axial random field within the XY plane. We numerically investigate signatu…