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

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

Research output: Contribution to journalArticle

20 Citations (Scopus)

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 languageEnglish
Pages (from-to)631-646
Number of pages16
JournalQuantum Information Processing
Volume8
Issue number6
DOIs
Publication statusPublished - 2009 Dec 1

Fingerprint

Quantum Computing
Decoherence
quantum computation
Master Equation
Quantum Dots
Semiconductor quantum dots
Qubit
quantum dots
Charge
Point contacts
Spectral density
Contact
Green's function
Spectral Density
Nanostructures
Green's functions
Entanglement
Coupled System
Non-equilibrium
Electrons

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Statistical and Nonlinear Physics
  • Theoretical Computer Science
  • Signal Processing
  • Modelling and Simulation
  • Electrical and Electronic Engineering

Cite this

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Exact master equation and non-markovian decoherence for quantum dot quantum computing. / Tu, Matisse Wei Yuan; Lee, Ming Tsung; Zhang, Wei Min.

In: Quantum Information Processing, Vol. 8, No. 6, 01.12.2009, p. 631-646.

Research output: Contribution to journalArticle

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