NDLI: Open Quantum Systems with Loss and Gain

Content Provider	Springer Nature Link
Author	Eleuch, Hichem Rotter, Ingrid
Copyright Year	2014
Abstract	We consider different properties of small open quantum systems coupled to an environment and described by a non-Hermitian Hamilton operator. Of special interest is the non-analytical behavior of the eigenvalues in the vicinity of singular points, the so-called exceptional points (EPs), at which the eigenvalues of two states coalesce and the corresponding eigenfunctions are linearly dependent from one another. The phases of the eigenfunctions are not rigid in approaching an EP and providing therewith the possibility to put information from the environment into the system. All characteristic properties of non-Hermitian quantum systems hold true not only for natural open quantum systems that suffer loss due to their embedding into the continuum of scattering wavefunctions. They appear also in systems coupled to different layers some of which provide gain to the system.Thereby gain and loss, respectively, may be fixed inside every layer, i.e. characteristic of it.
Starting Page	3877
Ending Page	3888
Page Count	12
File Format	PDF
ISSN	00207748
Journal	International Journal of Theoretical Physics
Volume Number	54
Issue Number	11
e-ISSN	15729575
Language	English
Publisher	Springer US
Publisher Date	2014-10-24
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Open quantum systems PT Symmetry Exceptional points Phase rigidity Loss and gain in open quantum systems Physics Quantum Physics Elementary Particles, Quantum Field Theory Theoretical, Mathematical and Computational Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mathematics

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