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Acta Sinica Quantum Optica

Implementing Entangled State via Selective Resonant Interaction

Xiu‐Min Lin

Published Jan 1, 2011• 0 citations
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Abstract

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.

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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.
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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.
We present a simple scheme to realize a highly controlled and selective atom-field interaction in cavity quantum electrodynamics system. It is shown that, based on such a selective interaction, nontrivial Dicke states of NNN trapped neutral atoms can be produced step by step in an optical cavity with a very high fidelity in the presence of the cavity decay. The scheme does not need a single-photon source and its injection into an optical cavity, and the atomic spontaneous emission is strongly suppressed due to a large atom-field detuning.
We present a scheme in which the N-atom W state is teleported by employing the selective interaction of a cavity field with a driven three-level atom in the A configuration and detecting a single atom in one of the ground states. The long-lived W state is teleported from atom A to atom B when the atoms B and A are sent through a cavity successively and atom A is then detected. The advantage is that the present one does not involve the Bell-state measurement and is robust against the atomic spontaneous emission.
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.