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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

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.

Original languageAmerican English
Pages (from-to)631-646
Number of pages16
JournalQuantum Information Processing
Volume8
Issue number6
DOIs
StatePublished - Dec 2009
Externally publishedYes

Keywords

  • Functional analytic methods
  • Nanoelectronic devices
  • Non-equilibrium dynamics
  • Quantum computation
  • Quantum decoherence
  • Quantum measurements

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