Open AccessInstability of Charge Qubit Outfitted in a Double Quantum Dot
Author(s) -
Igor Filikhin,
A. Karoui,
Vojislav V. Mitić,
T. Zatezalo,
Branislav Vlahović
Publication year - 2021
Publication title -
mathematical modelling and geometry
Language(s) - English
Resource type - Journals
ISSN - 2311-1275
DOI - 10.26456/mmg/2021-931
Subject(s) - quantum tunnelling , physics , charge qubit , qubit , quantum mechanics , hamiltonian (control theory) , quantum dot , electron , asymmetry , phase qubit , charge (physics) , condensed matter physics , quantum , quantum electrodynamics , atomic physics , mathematics , mathematical optimization
We study electron tunneling in binary quantum systems as double quantum dot (DQD) and double quantum well (DQW), considered as two-level systems. The Schrodinger equation for this system is reduced using single band kp-effective Hamiltonian, and is solved numerically. We calculate full electron spectrum E, n = 1,2 ... in the bi-confinement potential. The tunneling in DQD is studied in relation to two factors, a coupling coefficient W and an asymmetry factor A of the potential. The ratio W/A defines the electron localization in DQD. The cases of ideal and almost ideal DQD are examined and compared. We are modeling the effects of environmental influence and fluctuations of electrical pulse on the coherence of DQD based charge qubit. In particular, we show that the coupling in the ideal DQD (A=0) is unstable for any small fluctuations of A.