Robust entanglement of an asymmetric quantum dot molecular system in a Josephson junction

• Published in: Heliyon Vol. 6; no. 7; p. e04484
• Main Authors: Afsaneh, E., Bagheri Harouni, M.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2020; Elsevier
• Subjects: Josephson junction; Quantum dot molecule; Quantum entanglement; Quantum mechanics; Quantum transport; Superconductors; Superconductors; Quantum entanglement; Quantum dot molecule; Josephson junction; Quantum mechanics; Quantum transport
• ISSN: 2405-8440; 2405-8440
• DOI: 10.1016/j.heliyon.2020.e04484

We demonstrate the generation of robust entanglement of a quantum dot molecular system in a voltage-controlled junction. To improve the quantum information characteristics of this system, we propose an applicable protocol which contains the implementation of asymmetric quantum dots as well as the engineering of reservoirs. Quantum dots can provide asymmetric coupling coefficients due to the tunable energy barriers through the gap voltage changes. To engineer the reservoirs, superconducting leads are used to prepare a voltage-biased Josephson junction. The high-controllability properties of this system give the arbitrary magnitude of entanglement by the arrangement of parameters. Significantly, the perfect entanglement can be achieved for an asymmetric structure in response to the increase of bias voltage, and also it continues saturated with the near-unit amount. Quantum mechanics; Quantum dot molecule; Quantum entanglement; Quantum transport; Superconductors; Josephson junction