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Journal of Yanbian University

Preparation of a maximally entangled state of twoladder-type three-level atoms having different coupling constant with the cavity

Jin Xing-Ri

Published Jan 1, 2004• 0 citations
OpenAlex

Abstract

We propose a scheme to prepare a maximally entangled state of two ladder-type three-level atoms with have difference coupling constant with a non-resonant thermal cavity and driven by the external strong classical flied. Because of the external driven strong classical flied, the photon-number-dependent parts in the effective Hamiltonian are canceled. The advantage of scheme is that the cavity may be in any state.

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We propose a scheme to prepare a maximally entangled state of two ladder-type three-level atoms with have difference coupling constant with a non-resonant thermal cavity and driven by the external strong classical flied. Because of the external driven strong classical flied, the photon-number-dependent parts in the effective Hamiltonian are canceled. The advantage of scheme is that the cavity may be in any state.
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We propose a scheme for generating maximally entangled states for two or more two-level atoms in a thermal cavity. The cavity frequency is large-detuned from the atomic transition frequency, so the Hamiltonian can be expressed as an effective form. The photon-number-dependent parts in the effective Hamiltonian are cancelled with the assistance of a strong classical field, thus the scheme is insensitive to both the cavity decay and the thermal field. The scheme can be used to generate multi-atom Bell-state and Greenberger–Horne–Zeiliner (GHZ) state.
A scheme is suggested for the generation of multi-atom maximally entangled states with a cavity in a thermalstate. In this scheme several appropriately prepared two-level atoms are simultaneously sent through the nonresonantcavity. We divide the whole atom-cavity interaction time into two equal parts. At the end of the first part a π pulse isapplied to the atoms using a classical field. Then the photon-number-dependent shifts on the atomic states are cancelledand the atomic system finally evolves to a maximally entangled state.
A scheme is suggested for the generation of multi-atom maximally entangled states with a cavity in a thermalstate. In this scheme several appropriately prepared two-level atoms are simultaneously sent through the nonresonantcavity. We divide the whole atom-cavity interaction time into two equal parts. At the end of the first part a π pulse isapplied to the atoms using a classical field. Then the photon-number-dependent shifts on the atomic states are cancelledand the atomic system finally evolves to a maximally entangled state.