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Phonon-Induced Pure Dephasing of Two-Electron Spin States in Vertical Quantum Dot Molecules

100%
Roszak K., Machnikowski P.
Acta Physica Polonica A
|
2009
|
vol. 116
|
issue 5
877-878
EN
Phonon-induced dephasing of two-electron spin states in two vertically stacked self-assembled GaAs/InGaAs quantum dots is studied. A pure dephasing process due to elastic phonon scattering is found to dominate at low temperatures. This process is independent of the spin-orbit coupling and does not require the presence of a magnetic field. It relies on interdot tunneling and the Pauli principle, which make the double quantum dot gate for spin based quantum computing possible, and therefore cannot be avoided.
2
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Complete and Partial Loss of Entanglement Due to a Phonon-Assisted Dephasing Process

81%
Roszak K., Machnikowski P., Jacak L.
Acta Physica Polonica A
|
2006
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vol. 110
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issue 3
331-336
EN
We study the evolution of entanglement between two excitons in a double quantum dot system coupled to a super-Ohmic reservoir. As expected entanglement is more fragile than local coherence, but, surprisingly, for a set of pure states disentanglement can be complete in a finite time under conditions that lead to the usual partial pure-dephasing.
3
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Phonon-Induced Dephasing in Quantum Dots - Interpretation in Terms of Information Leakage

81%
Roszak K., Machnikowski P., Jacak L.
Acta Physica Polonica A
|
2006
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vol. 110
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issue 3
325-330
EN
We show that the phonon-induced pure dephasing of excitons in quantum dots can be interpreted in terms of information leakage from the carrier subsystem to the lattice environment. We derive a quantitative relation between the coherence of the system, as manifested by the amplitude of the coherent optical polarization, and the amount of available which path information on the system state, quantified by the distinguishability of states.
4
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Singlet-Triplet Dephasing in Asymmetric Quantum Dot Molecules

81%
Marcinowski Ł., Roszak K., Machnikowski P.
Acta Physica Polonica A
|
2009
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vol. 116
|
issue 5
874-876
EN
We discuss pure dephasing of singlet-triplet superpositions in two-electron double quantum dots due to elastic phonon scattering. We generalize our previous results to a system built of two non-identical dots. We show that the asymmetry must be very strong in order to considerably affect the dephasing rate.
5
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Disentanglement and Black Holes: Information Problem

81%
Radosz A., Gusin P., Roszak K.
Acta Physica Polonica A
|
2017
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vol. 132
|
issue 1
132-134
EN
One of the possible ways of formulation of an information loss paradox refers to an entanglement of the two particles created in a vicinity of an event horizon. Evolution of the entangled particles and an interaction with their own environments should lead to a decay of the entanglement. However obvious, such a perspective appears to be too naive in this case.
6
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One and Two Phonon Assisted Transitions between Exciton Spin States in a Quantum Dot

81%
Roszak K., Machnikowski P., Axt V., Kuhn T.
Acta Physica Polonica A
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2008
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vol. 114
|
issue 5
1329-1335
EN
Exciton spin decay is studied in a self-assembled InAs/GaAs quantum dot. The spin relaxation results from an interplay of two factors: the Bir-Pikus Hamiltonian and the short-range exchange interaction, leading to one and two phonon assisted transitions. We establish a hierarchy between the resulting transition rates and show the dominating role of transverse phonons for all the transitions.
7
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Collective Luminescence and Phonon-Induced Processes in Double Quantum Dots

81%
Machnikowski P., Roszak K., Sitek A.
Acta Physica Polonica A
|
2009
|
vol. 116
|
issue 5
818-825
EN
We study the evolution of a quantum state of a double quantum dot system interacting with the electromagnetic environment and with the lattice modes, in the presence of a coupling between the two dots. We propose a unified approach to the simulation of the system evolution under joint impact of the two reservoirs. We discuss the sub- and superradiant radiative decay of the system, the phonon-induced decay of entanglement between the dots, and the transfer of excitation between them.
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