Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-01-14
J. Comp. Theor. Nanosci. 1, 132-143 (2004)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
25 pages, 1 figure
Scientific paper
Different approaches in quantifying environmentally-induced decoherence are considered. We identify a measure of decoherence, derived from the density matrix of the system of interest, that quantifies the environmentally induced error, i.e., deviation from the ideal isolated-system dynamics. This measure can be shown to have several useful features. Its behavior as a function of time has no dependence on the initial conditions, and is expected to be insensitive to the internal dynamical time scales of the system, thus only probing the decoherence-related time dependence. For a spin-boson model - a prototype of a qubit interacting with environment - we also demonstrate the property of additivity: in the regime of the onset of decoherence, the sum of the individual qubit error measures provides an estimate of the error for a several-qubit system, even if the qubits are entangled, as expected in quantum-computing applications. This makes it possible to estimate decoherence for several-qubits quantum computer gate designs for which explicit calculations are exceedingly difficult.
Fedichkin Leonid
Fedorov Arkady
Privman Vladimir
No associations
LandOfFree
Evaluation of Decoherence for Quantum Control and 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 Evaluation of Decoherence for Quantum Control and Computing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evaluation of Decoherence for Quantum Control and Computing will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-299804