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- W4300781641 abstract "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." @default.
- W4300781641 created "2022-10-04" @default.
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- W4300781641 date "2004-01-14" @default.
- W4300781641 modified "2023-09-26" @default.
- W4300781641 title "Evaluation of Decoherence for Quantum Control and Computing" @default.
- W4300781641 doi "https://doi.org/10.48550/arxiv.cond-mat/0401248" @default.
- W4300781641 hasPublicationYear "2004" @default.
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