Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

physica status solidi (b)

Phonon‐induced disentanglement of confined excitons

Katarzyna Roszak, Paweł Machnikowski, Lucjan Jacak

Published Jul 12, 2006• 2 citations
Publisher

Abstract

Abstract We show that phonon‐induced pure dephasing of excitons in quantum dots, which leads only to partial decay of system coherence, may completely erase entanglement between two excitons. We also discuss the role of the distance between the subsystems for this disentanglement process. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

DOI
10.1002/pssb.200668085

Related papers

Pure dephasing of two charge qubits in coupled quantum dots

W. Ben Chouikha, S. Jaziri, R. Bennaceur

Abstract We study the pure dephasing of two electrons confined in vertically coupled quantum dots, in which the presence of one electron confined in the double dot represents one qubit. We numerically evaluated the dephasing rates due to electrons coupling to both acoustic and optical phonons. Our numerically results show that the pure dephasing rates dependent on the separation between dots and the strength of electrons confinement. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics•Nov 22, 2006•0 citations

Decoherence and quantum entangled exciton states in semiconductor quantum dot molecule

A. Hichri, S. Jaziri, R. Ferreira

Recently a pair of vertically aligned quantum dots has been suggested as optically driven quantum gate. The later is built when two different particles, an electron and a hole, are created optically. The two particles form entangled states. We study theoretically the dynamics of a single heavy hole exciton confined in a small vertically coupled quantum dot. We use harmonic potentials to model the confining of electrons and holes and calculate the exciton's energy spectrum using the Hund-Mulliken approach, and including the Coulomb interaction. The entanglement may be controlled by the application of external electric field. At certain times of dynamical evolution one can generate a maximally entangled coherent exciton state by initially preparing the quantum dots in a superposition of coherent state. In ideal situations, entangled quantum states would not decohere during processing and transmission of quantum information. However, a real quantum system is inevitably influenced by its environment. Since, we study the decoherence effect caused by the interaction of the confined carriers with the acoustic phonon effects. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics•Feb 1, 2004•2 citations

Entanglement‐buildup through charged‐exciton decay in a semiconductor quantum dot

Ulrich Hohenester, Claudia Sifel

We analyze the decay of a single-electron charged exciton in a quantum dot embedded in a field effect structure. We show how the quantum properties of the charged exciton are transferred through tunneling and relaxation to the spin entanglement between electrons in the dot and contact, carefully examine the proper theoretical description of the underlying scattering processes, and identify the pertinent disentanglement mechanisms. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics•Feb 1, 2004•0 citations

Two‐photon processes in quantum dots: biexciton Rabi oscillations and exciton polarization flipping

Paweł Machnikowski

Abstract The paper discusses two‐photon Rabi oscillations between the ground state of a quantum dot and the biexciton state, as well as two‐photon oscillations between the two single‐exciton states with different circular polarizations. The effect of phonon‐induced decoherence on these processes is also described. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics•Feb 20, 2008•6 citations

Adiabatic rapid passage in quantum dots: phonon‐assisted decoherence and biexciton generation

Krzysztof Gawarecki, S. Lüker, Doris E. Reiter +5 more

Abstract We study the evolution of a quantum dot controlled by a frequency‐swept (chirped), linearly polarized laser pulse in the presence of carrier‐phonon coupling. The final occupation of the exciton state is limited both due to phonon‐induced transitions between the adiabatic spectral branches and because of phonon‐assisted transitions to the biexcitostate. When the biexciton shift is large enough, the quantum dot can be modeled as a two‐level system, which corresponds to excitation with circularly polarized light. For this case, we compare different methods of simulations: (i) a time convolutionless method, (ii) correlation expansion and (iii) path integrals. We show that results obtained from these methods agree perfectly at temperatur. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

arXiv:1210.6096•Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics•May 31, 2013•3 citations

Observation of an unusual temperature dependence of the initial decoherence time in quantum dots

V. M. Axt, T. Kühn, Alexei Vagov +3 more

We report on four-wave-mixing experiments in self-assembled InAs/GaAs quantum dots and compare with a theory that accounts for the pure-dephasing induced by acoustic phonons. The measurements demonstrate an unusual non-monotonous temperature dependence of the initial decoherence time in full agreement with previous theoretical predictions made on the basis of a model that concentrates on the lowest electronic states. For samples exhibiting strong electronic confinement this model even yields a good quantitative agreement with the experiments while for less confined samples there are some systematic deviations although many qualitative features are still well reproduced by the model. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics•May 1, 2005•0 citations
Abstract We show that phonon‐induced pure dephasing of excitons in quantum dots, which leads only to partial decay of system coherence, may completely erase entanglement between two excitons. We also discuss the role of the distance between the subsystems for this disentanglement process. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Recently a pair of vertically aligned quantum dots has been suggested as optically driven quantum gate. The later is built when two different particles, an electron and a hole, are created optically. The two particles form entangled states. We study theoretically the dynamics of a single heavy hole exciton confined in a small vertically coupled quantum dot. We use harmonic potentials to model the confining of electrons and holes and calculate the exciton's energy spectrum using the Hund-Mulliken approach, and including the Coulomb interaction. The entanglement may be controlled by the application of external electric field. At certain times of dynamical evolution one can generate a maximally entangled coherent exciton state by initially preparing the quantum dots in a superposition of coherent state. In ideal situations, entangled quantum states would not decohere during processing and transmission of quantum information. However, a real quantum system is inevitably influenced by its environment. Since, we study the decoherence effect caused by the interaction of the confined carriers with the acoustic phonon effects. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Abstract We study the evolution of a quantum dot controlled by a frequency‐swept (chirped), linearly polarized laser pulse in the presence of carrier‐phonon coupling. The final occupation of the exciton state is limited both due to phonon‐induced transitions between the adiabatic spectral branches and because of phonon‐assisted transitions to the biexcitostate. When the biexciton shift is large enough, the quantum dot can be modeled as a two‐level system, which corresponds to excitation with circularly polarized light. For this case, we compare different methods of simulations: (i) a time convolutionless method, (ii) correlation expansion and (iii) path integrals. We show that results obtained from these methods agree perfectly at temperatur. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
We report on four-wave-mixing experiments in self-assembled InAs/GaAs quantum dots and compare with a theory that accounts for the pure-dephasing induced by acoustic phonons. The measurements demonstrate an unusual non-monotonous temperature dependence of the initial decoherence time in full agreement with previous theoretical predictions made on the basis of a model that concentrates on the lowest electronic states. For samples exhibiting strong electronic confinement this model even yields a good quantitative agreement with the experiments while for less confined samples there are some systematic deviations although many qualitative features are still well reproduced by the model. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)