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Journal of Qufu Normal University

Preparation of the GHZ-Type Quantum State of the Atoms

Fengguo Fan

Published Jan 1, 2011• 0 citations
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Abstract

Combining cavity quantum electrodynamics and cold atom technology,using atomic interaction with cavity field,by controlling the atomic speed to control the interaction time in the cavity,the preparation of atom entanglement state was investigated theoretically,and the preparation methods of the atom GHZ state was discussed using a weak coherent state cavity field.

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Acta Sinica Quantum Optica•Jan 1, 2002•0 citations
Combining cavity quantum electrodynamics and cold atom technology,using atomic interaction with cavity field,by controlling the atomic speed to control the interaction time in the cavity,the preparation of atom entanglement state was investigated theoretically,and the preparation methods of the atom GHZ state was discussed using a weak coherent state cavity field.
By using a vacuum state interaction with atoms,combining cavity field cavity quantum electrodynamics technology,and controlling the flying speed of atoms in cavity to adjust the effect time of atoms and cavity field,considered the volution situation bewtween quantum states and role of the evolution of cavity field in the case of non-vacuum state cavity quantum states,the method of entanglement and teleportation quantum states of multi-particle and multi-photon cavity field in the atomic state of the GHZ type is studied.
For the sake of making this kind of useful quantum information resource of quantum entanglement.Here we propose a new prepare process on the foundation of the cavity quantum electrodynamics technique project of the resonance interaction,put forward a kind of making process that atom entangled state.Made to prepare two typical quantum entangled states in cavity QED: GHZ and W states of atoms,which belong to inequivalent classes of entangled states.GHZ state is maximally entangled state,while W states are non-maximally entangled states.They hold many interesting applications in quantum information processing and high-precision measurements.Therefore it is expected to be implemented with the current cavity QED experimental technology.
This paper proposes a simple scheme for generating a three-atom GHZ state via cavity quantum electrodynamics (QED). The task can be achieved through the interaction between two EPR states, which can be prepared easily with current technology. In this scheme, the cavity field is only virtually excited during the interaction process, and no quantum information transfer between the atoms and the cavity is required. Thus it greatly prolongs the efficient decoherent time. Moreover, this scheme is also applicable for generating an N -atom GHZ state.