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QUROPE - aggregated feeds in category PhysicsenPRA: Quantum information: Entanglement criterion for tripartite systems based on local sum uncertainty relations
http://link.aps.org/doi/10.1103/PhysRevA.97.042333
<p>Author(s): Y. Akbari-Kourbolagh and M. Azhdargalam</p><p>We propose a sufficient criterion for the entanglement of tripartite systems based on local sum uncertainty relations for arbitrarily chosen observables of subsystems. This criterion generalizes the tighter criterion for bipartite systems introduced by Zhang <i>etÂ al.</i> [C.-J. Zhang, H. Nha, Y.-S. Zhang,...</p><br/><p>[Phys. Rev. A 97, 042333] Published Thu Apr 19, 2018</p>Thu, 19 Apr 2018 12:00:00 +0200arXiv.org: Quantum Physics: Recipe for creating an arbitrary number of Floquet chiral edge states. (arXiv:1804.06407v1 [cond-mat.mes-hall])
http://arxiv.org/abs/1804.06407
<p>Floquet states of periodically driven systems could exhibit rich topological
properties. Many of them are absent in their static counterparts. One such
example is the chiral edge states in anomalous Floquet topological insulators,
whose description requires a new topological invariant and a novel type of
bulk-edge correspondence. In this work, we propose a prototypical quenched
lattice model, whose two Floquet bands could exchange their Chern numbers
periodically and alternatively via touching at quasienergies 0 and $\pi$ under
the change of a single system parameter.<p><a href="http://arxiv.org/abs/1804.06407">read more</a></p>
Thu, 19 Apr 2018 06:33:13 +0200arXiv.org: Quantum Physics: Hidden Messenger from Quantum Geometry: Towards Information Conservation in Quantum Gravity. (arXiv:1804.06408v1 [gr-qc])
http://arxiv.org/abs/1804.06408
<p>The back reactions of Hawking radiation allow nontrivial correlations between
consecutive Hawking quanta, which gives a possible way to resolving the paradox
of black hole information loss known as the hidden massenger method. In a
recent work of Ma et al [<a href="/abs/1711.10704">arXiv:1711.10704</a>], this method is enhanced by a
general derivation using small deviations of the states of Hawking quanta off
canonical typicality.<p><a href="http://arxiv.org/abs/1804.06408">read more</a></p>
Thu, 19 Apr 2018 06:33:13 +0200arXiv.org: Quantum Physics: Zero-dimensional topologically nontrivial state in a superconducting quantum dot. (arXiv:1804.06415v1 [cond-mat.mes-hall])
http://arxiv.org/abs/1804.06415
<p>The classification of topological states of matter in terms of unitary
symmetries and dimensionality predicts the existence of nontrivial topological
states even in zero-dimensional systems, i.e., a system with a discrete energy
spectrum. Here, we show that a quantum dot coupled with two superconducting
leads can realize a nontrivial zero-dimensional topological superconductor with
broken time-reversal symmetry, which corresponds to the finite size limit of
the one-dimensional topological superconductor.<p><a href="http://arxiv.org/abs/1804.06415">read more</a></p>
Thu, 19 Apr 2018 06:33:13 +0200arXiv.org: Quantum Physics: Generalized trace distance approach to quantum non-Markovianity and detection of initial correlations. (arXiv:1804.06445v1 [quant-ph])
http://arxiv.org/abs/1804.06445
<p>A measure of quantum non-Markovianity for an open system dynamics, based on
revivals of the distinguishability between system states, has been introduced
in the literature using the trace distance as quantifier for
distinguishability. Recently it has been suggested to use as measure for the
distinguishability of quantum states the trace norm of Helstrom matrices, given
by weighted differences of statistical operators.<p><a href="http://arxiv.org/abs/1804.06445">read more</a></p>
Thu, 19 Apr 2018 06:33:13 +0200arXiv.org: Quantum Physics: Tests of hidden variable models by the relaxation of the measurement independence condition. (arXiv:1804.06452v1 [quant-ph])
http://arxiv.org/abs/1804.06452
<p>Bell inequalities or Bell-like experiments are supposed to test hidden
variable theories based on three intuitive assumptions: determinism, locality
and measurement independence. If one of the assumptions of Bell inequality is
properly relaxed, the probability distribution of the singlet state, for
example, can be reproduced by a hidden variable model. Models that deal with
the relaxation of some condition above, with more than one hidden variable,
have been studied in the literature nowadays.<p><a href="http://arxiv.org/abs/1804.06452">read more</a></p>
Thu, 19 Apr 2018 06:33:13 +0200arXiv.org: Quantum Physics: Realism-information complementarity in photonic weak measurements. (arXiv:1804.06472v1 [quant-ph])
http://arxiv.org/abs/1804.06472
<p>The emergence of realistic properties is a key problem in understanding the
quantum-to-classical transition. In this respect, measurements represent a way
to interface quantum systems with the macroscopic world: these can be driven in
the weak regime, where a reduced back-action can be imparted by choosing meter
states able to extract different amounts of information.<p><a href="http://arxiv.org/abs/1804.06472">read more</a></p>
Thu, 19 Apr 2018 06:33:13 +0200arXiv.org: Quantum Physics: Temperature effects on quantum non-Markovianity via collision models. (arXiv:1804.06522v1 [quant-ph])
http://arxiv.org/abs/1804.06522
<p>Quantum non-Markovianity represents memory during the system dynamics, which
is typically weakened by the temperature. We here study the effects of
environmental temperature on the non-Markovianity of an open quantum system by
virtue of collision models. The environment is simulated by a chain of
ancillary qubits that are prepared in thermal states with a finite temperature
$T$.<p><a href="http://arxiv.org/abs/1804.06522">read more</a></p>
Thu, 19 Apr 2018 06:33:13 +0200arXiv.org: Quantum Physics: Cavity-enhanced Raman emission from a single color center in a solid. (arXiv:1804.06533v1 [quant-ph])
http://arxiv.org/abs/1804.06533
<p>We demonstrate cavity-enhanced Raman emission from a single atomic defect in
a solid. Our platform is a single silicon-vacancy center in diamond coupled
with a monolithic diamond photonic crystal cavity. The cavity enables an
unprecedented frequency tuning range of the Raman emission (100 GHz) that
significantly exceeds the spectral inhomogeneity of silicon-vacancy centers in
diamond nanostructures. We also show that the cavity selectively suppresses the
phonon-induced spontaneous emission that degrades the efficiency of Raman
photon generation.<p><a href="http://arxiv.org/abs/1804.06533">read more</a></p>
Thu, 19 Apr 2018 06:33:13 +0200arXiv.org: Quantum Physics: Spatial search on Sierpinski carpet using quantum walk. (arXiv:1804.06549v1 [quant-ph])
http://arxiv.org/abs/1804.06549
<p>We investigate a spatial search problem on a fractal lattice using the
quantum walk. A recent study made a conjecture that the behavior of the search
on a fractal lattice is determined by the spectral dimension not by the fractal
dimension. However, this conjecture has so far only been discussed in
connection with two- and three-dimensional Sierpinski gaskets. We tackle this
problem for the two-dimensional Sierpinski carpet, and show that our simulation
result supports the conjecture.
</p>Thu, 19 Apr 2018 06:33:13 +0200