25 research outputs found
Quantum Fluctuation Dynamics of Dispersive Superradiant Pulses in a Hybrid Light-Matter System
We consider theoretically a driven-dissipative quantum many-body system
consisting of an atomic ensemble in a single-mode optical cavity as described
by the open Tavis-Cummings model. In this hybrid light-matter system the
interplay between coherent and dissipative processes leads to superradiant
pulses with a build-up of strong correlations, even for systems comprising
hundreds to thousands of particles. A central feature of the mean-field
dynamics is a self-reversal of two spin degrees of freedom due to an underlying
time-reversal symmetry, which is broken by quantum fluctuations. We demonstrate
a quench protocol that can maintain highly non-Gaussian states over long time
scales. This general mechanism offers interesting possibilities for the
generation and control of complex fluctuation patterns, as suggested for the
improvement of quantum sensing protocols for dissipative spin-amplification.Comment: 7 pages, 5 figures, 4 pages supplementa
The Lantern Vol. 34, No. 1, December 1967
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Quantum Fluctuation Dynamics of Dispersive Superradiant Pulses in a Hybrid Light-Matter System
We consider theoretically a driven-dissipative quantum many-body system consisting of an atomic ensemble in a single-mode optical cavity as described by the open Tavis-Cummings model. In this hybrid light-matter system, the interplay between coherent and dissipative processes leads to superradiant pulses with a buildup of strong correlations, even for systems comprising hundreds to thousands of particles. A central feature of the mean-field dynamics is a self-reversal of two spin degrees of freedom due to an underlying time-reversal symmetry, which is broken by quantum fluctuations. We demonstrate a quench protocol that can maintain highly non-Gaussian states over long timescales. This general mechanism offers interesting possibilities for the generation and control of complex fluctuation patterns, as suggested for the improvement of quantum sensing protocols for dissipative spin amplification.ISSN:0031-9007ISSN:1079-711
Description of Adult and Fourth-Stage Larva of Litomosoides navonae n. sp. (Nematoda: Onchocercidae), a Parasite of Five Species of Sigmodontine Rodents from Northeastern Argentina
Comparison of wild-type and UV-mutant β-glucanase-producing strains of Talaromyces emersonii with potential in brewing applications
Genetics of the connectome
Connectome genetics attempts to discover how genetic factors affect brain connectivity. Here we review a variety of genetic analysis methods-such as genome-wide association studies (GWAS), linkage and candidate gene studies-that have been fruitfully adapted to imaging data to implicate specific variants in the genome for brain-related traits. Studies that emphasized the genetic influences on brain connectivity. Some of these analyses of brain integrity and connectivity using diffusion MRI, and others have mapped genetic effects on functional networks using resting state functional MRI. Connectome-wide genome-wide scans have also been conducted, and we review the multivariate methods required to handle the extremely high dimension of the genomic and network data. We also review some consortium efforts, such as ENIGMA, that offer the power to detect robust common genetic associations using phenotypic harmonization procedures and meta-analysis. Current work on connectome genetics is advancing on many fronts and promises to shed light on how disease risk genes affect the brain. It is already discovering new genetic loci and even entire genetic networks that affect brain organization and connectivity