Exact Master Equation and Non-Markovian Decoherence for Quantum Dot Quantum Computing

Details Exact Master Equation and Non-Markovian Decoherence for Quantum Dot Quantum Computing Exact Master Equation and Non-Markovian Decoherence for Quantum Dot Quantum Computing

2009-10-02

arxiv.org/abs/0910.0302v1

Quantum Inf. process, 8, 631 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, Invited article for the special issue "Quantum Decoherence and Entanglement" in Quantum Inf. Process

Scientific paper

10.1007/s11128-009-0143-8

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.

Affiliated with

Also associated with

No associations

Rating

Exact Master Equation and Non-Markovian Decoherence for Quantum Dot Quantum Computing does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Exact Master Equation and Non-Markovian Decoherence for Quantum Dot Quantum Computing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exact Master Equation and Non-Markovian Decoherence for Quantum Dot Quantum Computing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-25798