Generation of entanglement between quantum dot molecule with the presence of phonon effects in a voltage-controlled junction
| Autor: | E. Afsaneh, Malek Bagheri Harouni |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Coupling Quantum Physics Quantum decoherence Condensed matter physics Field (physics) Condensed Matter - Mesoscale and Nanoscale Physics Phonon General Physics and Astronomy FOS: Physical sciences Biasing Carbon nanotube Quantum entanglement Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences 010305 fluids & plasmas law.invention law Quantum dot 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 010306 general physics Quantum Physics (quant-ph) |
| DOI: | 10.48550/arxiv.2106.05614 |
| Popis: | We investigate the generation of entanglement through a quantum dot molecule under the influence of vibrational phonon modes in a bias voltage junction. The molecular quantum dot system is realized by coupled quantum dots inside a suspended carbon nanotube. We consider the dynamical entanglement as a function of bias voltage and temperature by taking into account the electron-phonon interaction. In order to generate the robust entanglement between quantum dots and preserve it to reach the maximal achievable amount steadily, we introduce an asymmetric coupling protocol and apply the easy tunable bias voltage-driven field. For an oscillating bias voltage, the time-varying entanglement can periodically reach the maximum revival. In thermal entanglement dynamics, the phenomena of thermal entanglement degradation and thermal entanglement revival are observed which are intensively affected by the strength of phonon decoherence. The revival of entanglement shows a larger value for a higher phonon coupling. |
| Databáze: | OpenAIRE |
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