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Phonon-Induced Enhancement of Photon Entanglement in Quantum Dot-Cavity Systems

Titelangaben

Seidelmann, Tim ; Ungar, Florian ; Barth, Andreas M. ; Vagov, Alexei ; Axt, Vollrath Martin ; Cygorek, Moritz ; Kuhn, T.:
Phonon-Induced Enhancement of Photon Entanglement in Quantum Dot-Cavity Systems.
In: Physical Review Letters. Bd. 123 (2019) Heft 13 . - 137401.
ISSN 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.123.137401

Angaben zu Projekten

Projektfinanzierung: Alexander von Humboldt-Stiftung
Deutsche Forschungsgemeinschaft
Russian Science Foundation under the Project No. 18-12-00429, which was used to study dynamical processes nonlocal in time by the path-integral approach.

Abstract

We report on simulations of the degree of polarization entanglement of photon pairs simultaneously emitted from a quantum dot-cavity system that demand revisiting the role of phonons. Since coherence is a fundamental precondition for entanglement and phonons are known to be a major source of decoherence, it seems unavoidable that phonons can only degrade entanglement. In contrast, we demonstrate that phonons can cause a degree of entanglement that even surpasses the corresponding value for the phonon-free case. In particular, we consider the situation of comparatively small biexciton binding energies and either finite exciton or cavity mode splitting. In both cases, combinations of the splitting and the dot-cavity coupling strength are found where the entanglement exhibits a nonmonotonic temperature dependence which enables entanglement above the phonon-free level in a finite parameter range. This unusual behavior can be explained by phonon-induced renormalizations of the dot-cavity coupling g in combination with a nonmonotonic dependence of the entanglement on g that is present already without phonons.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: quantum dot; path-integrals; entanglement; concurrence; microcavity; polarization entaglement; two-time correlation functions; nonlinear optics; ultrafast dynamics; pure dephasing; phonons; decoherence; excitons; biexcitons; non-Markovian dynamics; memory effects; phonon-induced memory; multi-phonon processes; quantum dissipative dynamics; numerically exact; Lindblad operators; non-Hamiltonian dynamics
Fachklassifikationen: condensed matter physics (theoretical)
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III > Lehrstuhl Theoretische Physik III - Univ.-Prof. Dr. Martin Axt
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 26 Sep 2019 09:24
Letzte Änderung: 03 Aug 2023 12:33
URI: https://eref.uni-bayreuth.de/id/eprint/52443