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Emission-Frequency Separated High Quality Single-Photon Sources Enabled by Phonons

Title data

Cosacchi, Michael ; Ungar, Florian ; Cygorek, Moritz ; Vagov, Alexei ; Axt, Vollrath Martin:
Emission-Frequency Separated High Quality Single-Photon Sources Enabled by Phonons.
In: Physical Review Letters. Vol. 123 (2019) Issue 1 . - Art.Nr. 017403.
ISSN 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.123.017403

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.

Abstract in another language

We demonstrate theoretically that the single-photon purity of photons emitted from a quantum dot exciton prepared by phonon-assisted off-resonant excitation can be significantly higher in a wide range of parameters than that obtained by resonant preparation for otherwise identical conditions. Despite the off- resonant excitation, the brightness stays on a high level. These surprising findings exploit the fact that the phonon-assisted preparation is a two-step process where phonons first lead to a relaxation between laser- dressed states while high exciton occupations are reached only with a delay to the laser pulse maximum by adiabatically undressing the dot states. Due to this delay, possible subsequent processes, in particular multiphoton excitations, appear at a time when the laser pulse is almost gone. The resulting suppression of reexcitation processes increases the single-photon purity. Due to the spectral separation of the signal photons from the laser frequencies this enables the emission of high quality single photons not disturbed by a laser background while taking advantage of the robustness of the phonon assisted scheme.

Further data

Item Type: Article in a journal
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; photon purity
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: 09 Jul 2019 07:26
Last Modified: 09 Jul 2019 07:26
URI: https://eref.uni-bayreuth.de/id/eprint/49893