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21 papers · 2 filters
Spatial and temporal characteristics of spontaneous parametric down-conversion with varying focal planes of interacting beams
Richard Bernecker, Baghdasar Baghdasaryan, Stephan Fritzsche
Spontaneous parametric down-conversion (SPDC) is a widely used process to prepare entangled photon pairs. In SPDC, a second-order nonlinear crystal is pumped by a coherent laser be…
Detecting continuous variable entanglement in phase space with the -distribution
Martin Gärttner, Tobias Haas, Johannes Noll
We prove a general class of continuous variable entanglement criteria based on the Husimi -distribution, which represents a quantum state in canonical phase space, by employing…
General class of continuous variable entanglement criteria
Martin Gärttner, Tobias Haas, Johannes Noll
We present a general class of entanglement criteria for continuous variable systems. Our criteria are based on the Husimi -distribution and allow for optimization over the set o…
Maximizing the Validity of the Gaussian Approximation for the biphoton State from Parametric Downconversion
Baghdasar Baghdasaryan, Fabian Steinlechner, Stephan Fritzsche
Spontaneous parametric down-conversion (SPDC) is widely used in quantum applications based on photonic entanglement. The efficiency of photon pair generation is often characterized…
Information Scrambling and the Correspondence of Entanglement- and Operator Dynamics in Systems with Nonlocal Interactions
Darvin Wanisch, Juan Diego Arias Espinoza, Stephan Fritzsche
How fast quantum information scrambles such that it becomes inaccessible by local probes turns out to be central to various fields. Motivated by recent works on spin systems with n…
Observation of anisotropy-independent magnetization dynamics in spatially disordered Heisenberg spin systems
Titus Franz, Sebastian Geier, Clément Hainaut +7
An important step towards a comprehensive understanding of far-from-equilibrium dynamics of quantum many-body systems is the identification of unifying features that are independen…