2007/12/28 by Zhiqiang Li, Zhi-Qiang Li, Xian-Ting Liang
Computer Science · Physics and Astronomy · #Amplitude #Charge qubit #Engineering physics #Master equation #Ohmic contact #Phase qubit #Physics #Quantum #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum decoherence #Quantum mechanics #Qubit #Solid-state #Spectroscopy and Quantum Chemical Studies #quant-ph
paper · pdf · doi:10.1016/j.physe.2007.12.003
published as Physica E 40 (2008) 2671-2676 · 9 pages, 8 figures
openalex publication_date 2007/12/28 · arxiv created 2008/03/31 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In this paper we study the decoherence and purity of a driven solid-state qubit in the Ohmic bath by using the method based on the master equation. At first, instead of solving the master equation we investigate the coefficients of the equation which describe the shift in frequency, diffusive, decoherence, and so on. It is shown that one of the coefficients (we called it decoherence coefficient) is crucial to the decoherence of the qubit in the model. Then we investigate the evolution of the purity of the state in the model. From the analysis of the purity we see that the decoherence time of the qubit decrease with the increase of the amplitude of the driven fields and it is increase with the increase of the frequency of the driven fields.