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Journal of Optics B Quantum and Semiclassical Optics

Scalable generation of multi-atom W states with a single resonant interaction

Shi‐Biao Zheng

Published Nov 23, 2004• 46 citations
Publisher

Abstract

A scalable scheme is presented for generating W-type entangled states for many atoms. The scheme only requires a single resonant interaction of the atoms with a cavity mode. The time required to complete the process does not increase with the number of atoms. The scheme can also be used to generate the W states for multiple trapped ions with a single interaction.

DOI
10.1088/1464-4266/7/1/003

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A scalable scheme is presented for generating W-type entangled states for many atoms. The scheme only requires a single resonant interaction of the atoms with a cavity mode. The time required to complete the process does not increase with the number of atoms. The scheme can also be used to generate the W states for multiple trapped ions with a single interaction.
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A scheme is presented for generating entangled states for two atoms in a cavity. In the scheme two atoms simultaneously interact with a cavity mode with a small detuning. The operation time is very short and thus the decoherence can be effectively suppressed. Furthermore, the scheme is valid no matter whether the two atoms have the same coupling strengths or not. The scheme can be used to generate multi-atom W states without the requirement of individual addressing of the atoms, which is also experimentally important. The scheme can also be generalized to produce entangled states in an ion trap without individually addressing the ions.
We propose a scheme for the generation of entangled states for multiple atoms trapped in three distant cavities connected by two identical single-mode fibers. Compared with the previous schemes, the distinct advantages of the proposed scheme are: First, all the cavities in the proposed protocol can interact with each other freely, which is important in quantum communication and distributed quantum computation. Secondly, in the scheme, the atoms, cavities, and fiber mode are in resonance. Thus, the required interaction time is short, which is important in view of decoherence. In principle, the proposed scheme can be extended to generate n atoms entangled states.