Pulse Control of Decoherence in a Qubit Coupled with a Quantum Environment

Details Pulse Control of Decoherence in a Qubit Coupled with a Quantum Environment Pulse Control of Decoherence in a Qubit Coupled with a Quantum Environment

2004-11-15

arxiv.org/abs/quant-ph/0411101v1

J. Phys. Soc. Jpn. 74(2005) Suppl. 265

Physics

Quantum Physics

5 pages, 2figures

Scientific paper

We study the time evolution of a qubit linearly coupled with a quantum environment under a sequence of short pi pulses. Our attention is focused on the case where qubit-environment interactions induce the decoherence with population decay. We assume that the environment consists of a set of bosonic excitations. The time evolution of the reduced density matrix for the qubit is calculated in the presence of periodic short pi pulses. We confirm that the decoherence is suppressed if the pulse interval is shorter than the correlation time for qubit-environment interactions.

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