Time evolution and decoherence of entangled states realized in coupled superconducting flux qubits

Details Time evolution and decoherence of entangled states realized in coupled superconducting flux qubits Time evolution and decoherence of entangled states realized in coupled superconducting flux qubits

2005-01-25

arxiv.org/abs/cond-mat/0501581v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures

Scientific paper

We study theoretically how decoherence affects superposition states composed of entangled states in inductively coupled two superconducting flux-qubits. We discover that the quantum fluctuation of an observable in a coupled flux-qubit system plays a crucial role in decoherence when the expectation value of the observable is zero. This examplifies that decoherence can be also induced through a quantum mechanically higher-order effect. We also find that there exists a decoherence free subspace for the environment coupled via a charge degree of freedom of the qubit system.

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