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Chinese Journal of Quantum Electronics

Generation of N-qubit cluster states via nonresonant cavity and classical field

Ye Liu

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

A simple experimental scheme to generate N-qubit atom cluster states is proposed. The task can be realized through the interaction between two three-level atoms within a nonresonant cavity and meanwhile driven by a classical field.During the interaction time,the cavity field is only virtually excited,and no quantum information transfer between the atoms and the cavity is required. The scheme is implemented without any measurement.Time of implemenation of the protocol does not change with the increase of the number of qubits.Our scheme can be realized under current technology.

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A simple experimental scheme to generate N-qubit atom cluster states is proposed. The task can be realized through the interaction between two three-level atoms within a nonresonant cavity and meanwhile driven by a classical field.During the interaction time,the cavity field is only virtually excited,and no quantum information transfer between the atoms and the cavity is required. The scheme is implemented without any measurement.Time of implemenation of the protocol does not change with the increase of the number of qubits.Our scheme can be realized under current technology.
We present a scheme to generate cluster states with many atoms in cavity QED via Raman transition. In this scheme, no transfer of quantum information between the atoms and cavities is required, the cavity fields are only virtually excited and thus the cavity decay is suppressed during the generation of cluster states. The atoms are always populated in the two ground states. Therefore, the scheme is insensitive to the atomic spontaneous emission and cavity decay. We also show how to transfer quantum information from one atom to another.
This paper proposes a simple scheme to generate a four-atom entangled cluster state in cavity quantum electrodynamics. With the assistantce of a strong classical field the cavity is only virtually excited and no quantum information will be transferred from the atoms to the cavity during the preparation for a four-atom entangled cluster state, and thus the scheme is insensitive to the cavity field states and cavity decay. Assuming that deviation of laser intensity is 0.01 and that of simultaneity for the interaction is 0.01, it shows that the fidelity of the resulting four-atom entangled cluster state is about 0.9886. The scheme can also be used to generate a four-ion entangled cluster state in a hot trapped-ion system. Assuming that deviation of laser intensity is 0.01, it shows that the fidelity of the resulting four-ion entangled cluster state is about 0.9990. Experimental feasibility for achieving this scheme is also discussed.