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Journal of Yanbian University

A Three-Qubit W State via Atoms-Cavity Nonidentical Coupling

Ying-Qiao Zhang

Published Jun 20, 2010• 0 citations
OpenAlex

Abstract

A scheme for generation of a three-Qubit W state is proposed in cavity QED based on nonidentical coupling between the atoms and the cavity. In this scheme, the atoms interact with a highly detuned cavity-field mode, the quantum information doesn't transfer between the atoms and cavity field, thus the cavity decay is negligible.

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A scheme for approximate generation of an N-qubit phase gate is proposed in cavity QED based on nonidentical coupling between the atoms and the cavity. The atoms interact with a highly detuned cavity-field mode, but quantum information does not transfer between the atoms and cavity field, and thus the cavity decay is negligible. The gate time does not rise with an increase in the number of qubits. With the choice of a smaller odd number l (related to atom–cavity coupling constants), the phase gate can be generated with a higher fidelity and a higher success probability in a shorter time (the gate time is much shorter than the atomic radiative lifetime and photon lifetime). When the number of qubits N exceeds certain small values, the fidelity and success probability rise slowly with an increase in the number of qubits N. When N → ∞ , the fidelity and success probability infinitely approach 1, but never exceed 1.
A scheme for the distant transfer of a qubit atomic state and atomic entangled states are presented.In the scheme,the identical two-level atoms interact simultaneously with a highly detuned cavity mode and are driven by a strong classical field,and the atomic state evolution is independent of cavity field state.Thus the scheme is insensitive to both the cavity decay and the thermal field and the requirement on the quality factor of the cavity is greatly loosened, which is of importance from the experimental point of view.