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Journal of Fujian Normal University

Implementing Phase Gate Via Selective Resonant Interaction

Xiu‐Min Lin

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

A scheme is presented to implement phase gate in a high-Q optical cavity.In the scheme,the atom-field interaction is controlled highly to yield a resonant interaction inside one selected atom-field subspace and leave the others in large detuning,which can be eliminated adiabatically.The atomic spontaneous emission is suppressed effectively since atomic ground state is only involved,and needlessness for addressing individually the atoms inside the cavity further lowers the difficulties of experiment.

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A scheme is presented to implement phase gate in a high-Q optical cavity.In the scheme,the atom-field interaction is controlled highly to yield a resonant interaction inside one selected atom-field subspace and leave the others in large detuning,which can be eliminated adiabatically.The atomic spontaneous emission is suppressed effectively since atomic ground state is only involved,and needlessness for addressing individually the atoms inside the cavity further lowers the difficulties of experiment.
A scheme is presented to generate Bell state and W state in a high-Q optical cavity with selective interaction.In the scheme,the parameters are selected to highly control the selective interaction between the atoms and the cavity field,yielding a resonant interaction inside one selected atom-field subspace and leaving the others in a highly dispersive regime,which can be eliminated adiabatically.So the scheme is insensitive to atomic spontaneous emission and will be realized easier due to commonly addressing the atoms inside the cavity.
We present a scheme to generate entangled state of two multilevel atoms in a high-Q optical cavity. In the protocol, the selective atom-field interaction is highly controlled, which can yield a resonant interaction inside one selected atom-field subspace and leave the others in a highly dispersive regime. The atomic spontaneous emission is efficiently suppressed via the large atom-field detuning. Simultaneously, the proposal only requires commonly addressing on atoms inside the cavity, which reduces the difficulties of experiment.
We propose a scheme for realizing a two-qubit quantum phase gate between atoms inside a high-QQQ optical cavity. In the scheme, the dispersive interaction between atoms and the cavity field induces photon-number Stark shift, which can yield a resonant interaction inside one selected atom-field subspace and leave the others in a highly dispersive regime. Due to the selective atom-cavity interaction, (1) the scheme only requires commonly addressing the atoms inside the optical cavity during the gate operation, and (2) it can be directly used to implement an NNN-qubit conditional phase gate. These properties can significantly reduce the number of operations for implementing quantum computation and quantum algorithms.
We propose a scheme for realization a quantum Controlled-NOT gate operation using two four-level atoms through a selective atom–cavity interaction in cavity quantum electrodynamics system. In our protocol, the quantum information is encoded on the stable ground states of the two atoms. During the interaction between atoms and single-mode vacuum cavity-field, the atomic spontaneous emission is negligible as the large atom–cavity detuning effectively suppresses the spontaneous decay of the atoms. The influences of the dissipation and the deviation of interaction time on fidelity and corresponding success probability of the quantum Controlled-NOT gate and the experimental feasibility of our proposal are also discussed.