Study of the decoherence of a double quantum dot charge qubit via the Redfield equation

2008/07/20 by Zeng-Zhao Li, Xiao‐Yin Pan, Xiao-Yin Pan +1 · 2 citations
Computer Science · Physics and Astronomy · #Charge (physics) #Charge qubit #Condensed matter physics #Coupling (piping) #Master equation #Materials science #Path integral formulation #Phase qubit #Physics #Quantum #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum decoherence #Quantum dissipation #Quantum dot #Quantum electrodynamics #Quantum mechanics #Qubit #Semiconductor Quantum Structures and Devices #quant-ph

paper · pdf · doi:10.1016/j.physe.2008.07.005

published in Physica E Low-dimensional Systems and Nanostructures 41(2), 220-223 (Elsevier BV) · 5 pages, 6 figures

arxiv created 2008/07/20 · openalex publication_date 2008/07/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

By using the Redfield form of the master equation, we investigate the decoherence times of a double quantum dot charge qubit (DQDCQ) in three different cases, namely when it is coupled to (I) the piezoelectric coupling phonon bath (PCPB), (II) the deformation coupling phonon bath (DCPB), and (III) the Ohmic bath. It is found that our results for case (I) and (II) are in the same magnitude with those obtained via the exact path integral methods, while for case (III), the decoherence time is in well agreement with the experimental value.

Citations

• Non-Markovian dynamics of double quantum dot charge qubits due to acoustic phonons
• Coherent and collective quantum optical effects in mesoscopic systems
• Charge-based quantum computing using single donors in semiconductors
• Charge qubit dynamics in a double quantum dot coupled to phonons
• Dynamics of the dissipative two-state system