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Chinese Journal of Quantum Electronics

A simple scheme for realizing four-photon GHZ state based on cavity quantum electrodynamics

Chen Yin-hna

Published Jan 1, 2012• 0 citations
OpenAlex

Abstract

A scheme is presented for generating four-photon Greenberger-Hornc-Zeilinger(GHZ) states with resonant interaction between a cascade type three-level atom and two bimodal cavities.In the proposed protocol,the quantuni information is encoded on Fock states of the cavity fields.Schrodinger equation of the system is solved and quantum states of interaction system are obtained.The detection of atom can collapse cavity to the desired GHZ state.It is shown that the scheme is simple and the experimental implementation is feasible.

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A scheme is presented for generating four-photon Greenberger-Hornc-Zeilinger(GHZ) states with resonant interaction between a cascade type three-level atom and two bimodal cavities.In the proposed protocol,the quantuni information is encoded on Fock states of the cavity fields.Schrodinger equation of the system is solved and quantum states of interaction system are obtained.The detection of atom can collapse cavity to the desired GHZ state.It is shown that the scheme is simple and the experimental implementation is feasible.
A simple scheme is presented for generating four-photon Greenberger-Horne-Zeilinger states with a large detuned interaction between a three-level atom and two bimodal cavities. In the proposed protocol, the quantum information is encoded on Fock states of the cavity-fields, and the atomic spontaneous emission can be effectively suppressed due to the fact that the excited state of the atom is adiabatically eliminated under the large detuning condition. The detection of the atom can collapse the cavity to the desired state. The experimental feasibility of our proposal is also discussed.
This paper proposes an alternative scheme for generating four-photon W state via cavity QED. The scheme bases on the resonant interaction of a λ-type three level atom with two bimodal cavities. The detection of atom collapses the cavity to the desired state. Comparing with previous schemes, the advantage of this scheme is that the interaction time can be greatly shortened since it uses the resonant interaction between atom and cavities. Moreover, the proposed scheme is more experimentally feasible than the previous ones.
We present a scheme to entangle fields in multiple cavities. Our scheme is based on the resonant interaction of a Ξ-type three-level atom with the cavity fields for precalculated interaction time, which enables us to generate a quantum entangled Greenberger–Horn–Zeilinger (GHZ) state of fields in multiple cavities. In principle, the scheme can be also generalized to generate N -party GHZ state. The required experimental techniques are within the scope of what can be obtained in the microwave cavity QED set up.