Universität zu Köln

Alberton, O., Buchhold, M. and Diehl, S. (2021). Entanglement Transition in a Monitored Free-Fermion Chain: From Extended Criticality to Area Law. Phys. Rev. Lett., 126 (17). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

We analyze the quantum trajectory dynamics of free fermions subject to continuous monitoring. For weak monitoring, we identify a novel dynamical regime of subextensive entanglement growth, reminiscent of a critical phase with an emergent conformal invariance. For strong monitoring, however, the dynamics favors a transition into a quantum Zeno-like area-law regime. Close to the critical point, we observe logarithmic finite size corrections, indicating a Berezinskii-Kosterlitz-Thouless mechanism underlying the transition. This uncovers an unconventional entanglement transition in an elementary, physically realistic model for weak continuous measurements. In addition, we demonstrate that the measurement aspect in the dynamics is crucial for whether or not a phase transition takes place.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Alberton, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Buchhold, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Diehl, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-567615
DOI:	10.1103/PhysRevLett.126.170602
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	126
Number:	17
Date:	2021
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language QUANTUM; DYNAMICS; MODEL Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/56761