## Title data

Seidelmann, Tim ; Ungar, Florian ; Barth, A. M. ; Vagov, Alexei ; Axt, Vollrath Martin ; Cygorek, M. ; Kuhn, T.:

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

*In:* Physical Review Letters.
Vol. 123
(2019)
Issue 13
.
- No. 137401.

ISSN 1079-7114

DOI: https://doi.org/10.1103/PhysRevLett.123.137401

## Project information

Project financing: |
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. |
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## Abstract in another language

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.

## Further data

Item Type: | Article in a journal |
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Refereed: | Yes |

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 |

Subject classification: | condensed matter physics (theoretical) |

Institutions of the University: | Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt |

Result of work at the UBT: | Yes |

DDC Subjects: | 500 Science > 530 Physics |

Date Deposited: | 26 Sep 2019 09:24 |

Last Modified: | 26 Sep 2019 09:24 |

URI: | https://eref.uni-bayreuth.de/id/eprint/52443 |