Universität zu Köln

Popkov, Vladislav and Presilla, Carlo (2016). Obtaining pure steady states in nonequilibrium quantum systems with strong dissipative couplings. Phys. Rev. A, 93 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9934

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Abstract

Dissipative preparation of a pure steady state usually involves a commutative action of a coherent and a dissipative dynamics on the target state. Namely, the target pure state is an eigenstate of both the coherent and dissipative parts of the dynamics. We show that working in the Zeno regime, i.e., for infinitely large dissipative coupling, one can generate a pure state by a noncommutative action, in the above sense, of the coherent and dissipative dynamics. A corresponding Zeno regime pureness criterion is derived. We illustrate the approach, looking at both its theoretical and applicative aspects, in the example case of an open XXZ spin-1/2 chain, driven out of equilibrium by boundary reservoirs targeting different spin orientations. Using our criterion, we find two families of pure nonequilibrium steady states, in the Zeno regime, and calculate the dissipative strengths effectively needed to generate steady states which are almost indistinguishable from the target pure states.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Popkov, Vladislav UNSPECIFIED UNSPECIFIED UNSPECIFIED Presilla, Carlo UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-284500
DOI:	10.1103/PhysRevA.93.022111
Journal or Publication Title:	Phys. Rev. A
Volume:	93
Number:	2
Date:	2016
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9934
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TRAPPED IONS; DYNAMICS; DRIVEN; BITS Multiple languages Optics; Physics, Atomic, Molecular & Chemical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28450