Exact master equation and non-markovian decoherence for quantum dot quantum computing

Matisse Wei Yuan Tu, Ming Tsung Lee, Wei Min Zhang

研究成果: Article同行評審

21 引文 斯高帕斯(Scopus)

摘要

In this article, we report the recent progress on decoherence dynamics of electrons in quantum dot quantum computing systems using the exact master equation we derived recently based on the Feynman-Vernon influence functional approach. The exact master equation is valid for general nanostructure systems coupled to multi-reservoirs with arbitrary spectral densities, temperatures and biases. We take the double quantum dot charge qubit system as a specific example, and discuss in details the decoherence dynamics of the charge qubit under coherence controls. The decoherence dynamics risen from the entanglement between the system and the environment is mainly non-Markovian. We further discuss the decoherence of the double-dot charge qubit induced by quantum point contact (QPC) measurement where the master equation is re-derived using the Keldysh non-equilibrium Green function technique due to the non-linear coupling between the charge qubit and the QPC. The non-Markovian decoherence dynamics in the measurement processes is extensively discussed as well.

原文English
頁(從 - 到)631-646
頁數16
期刊Quantum Information Processing
8
發行號6
DOIs
出版狀態Published - 2009 十二月

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 統計與非線性物理學
  • 理論電腦科學
  • 訊號處理
  • 建模與模擬
  • 電氣與電子工程

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