90,558 research outputs found
The quantum-classical transition as an information flow
We investigate the classical limit of the semiclassical evolution with reference to a well-known model that represents the interaction between matter and a given field. This is done by recourse to a special statistical quantifier called the "symbolic transfer entropy". We encounter that the quantum-classical transition gets thereby described as the sign-reversal of the dominating direction of the information flow between classical and quantal variables.Facultad de Ciencias Exacta
The quantum-classical transition as an information flow
We investigate the classical limit of the semiclassical evolution with reference to a well-known model that represents the interaction between matter and a given field. This is done by recourse to a special statistical quantifier called the "symbolic transfer entropy". We encounter that the quantum-classical transition gets thereby described as the sign-reversal of the dominating direction of the information flow between classical and quantal variables.Facultad de Ciencias Exacta
The quantum-classical transition as an information flow
We investigate the classical limit of the semiclassical evolution with reference to a well-known model that represents the interaction between matter and a given field. This is done by recourse to a special statistical quantifier called the "symbolic transfer entropy". We encounter that the quantum-classical transition gets thereby described as the sign-reversal of the dominating direction of the information flow between classical and quantal variables.Facultad de Ciencias Exacta
Polariton superfluids reveal quantum hydrodynamic solitons
A quantum fluid passing an obstacle behaves differently from a classical one.
When the flow is slow enough, the quantum gas enters a superfluid regime and
neither whirlpools nor waves form around the obstacle. For higher flow
velocities, it has been predicted that the perturbation induced by the defect
gives rise to the turbulent emission of quantised vortices and to the
nucleation of solitons. Using an interacting Bose gas of exciton-polaritons in
a semiconductor microcavity, we report the transition from superfluidity to the
hydrodynamic formation of oblique dark solitons and vortex streets in the wake
of a potential barrier. The direct observation of these topological excitations
provides key information on the mechanisms of superflow and shows the potential
of polariton condensates for quantum turbulence studies.Comment: Published version with corrected colorbar scale for Fig. 3. Raw data
available as ancillary file
Frozen and Invariant Quantum Discord under Local Dephasing Noise
In this chapter, we intend to explore and review some remarkable dynamical
properties of quantum discord under various different open quantum system
models. Specifically, our discussion will include several concepts connected to
the phenomena of time invariant and frozen quantum discord. Furthermore, we
will elaborate on the relation of these two phenomena to the non-Markovian
features of the open system dynamics and to the usage of dynamical decoupling
protocols.Comment: 29 pages, 8 figure
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