Thermal entanglement and quantum coherence of a single electron in a double quantum dot with Rashba Interaction

• URL: http://arxiv.org/abs/2203.06301v1
• Date: Sat, 12 Mar 2022 01:14:26 GMT
• Title: Thermal entanglement and quantum coherence of a single electron in a double quantum dot with Rashba Interaction
• Authors: Merynilda Ferreira, Onofre Rojas, Moises Rojas
• Abstract summary: We study the thermal quantum coherence in a semiconductor double quantum dot. The main goal of this work is to provide a good understanding of the effects of temperature and several parameters in quantum coherence.
• Score: 0.0
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: In this work, we study the thermal quantum coherence in a semiconductor double quantum dot. The device consists of a single electron in a double quantum dot with Rashba spin-orbit coupling in the presence of an external magnetic field. In our scenario, the thermal entanglement of the single electron is driven by the charge and spin qubits, the latter controlled by Rashba coupling. Analytical expressions are obtained for thermal concurrence and correlated coherence using the density matrix formalism. The main goal of this work is to provide a good understanding of the effects of temperature and several parameters in quantum coherence. In addition, our findings show that we can use the Rashba coupling to tune in the thermal entanglement and quantum coherence of the system. Moreover, we focus on the role played by thermal entanglement and correlated coherence responsible for quantum correlations. We observe that the correlated coherence is more robust than the thermal entanglement in all cases, so quantum algorithms based only on correlated coherence may be stronger than those based on entanglement.

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