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Chinese Physics Letters

Preparation of Entangled States of Three Particles by Adiabatic Passage

Guo Jian-you

Published Jul 30, 2002• 4 citations
Publisher

Abstract

We propose a novel technique for the creation of entangled states of three particles, based upon an adiabatic passage induced by a suitably crafted time-dependent external field. We derive the corresponding adiabatic and bare conditions for the preparation of entangled states. We obtain the time evolutions of the energy of the system and the populations involving the initial state and target entangled state.

DOI
10.1088/0256-307x/19/8/304

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We propose a novel technique for the creation of entangled states of three particles, based upon an adiabatic passage induced by a suitably crafted time-dependent external field. We derive the corresponding adiabatic and bare conditions for the preparation of entangled states. We obtain the time evolutions of the energy of the system and the populations involving the initial state and target entangled state.
We describe a novel technique for preparing the multiparticle W class states,which are based on adiabatic passage induced a suitably crafted time-dependent external field.We have derived the interaction Hamiltonian,and the adiabatic and diabatic evolution conditions of driving the system of n-spin-12 particles from initial unentangled state to the W class state.In addition,we show the diagram of the energies evolution and the populations of target state of transferring the system of three spin-12 particles from initial unentangled state to target entangled state of Wtype.
Preparation of entangled pairs of coupled two-state systems driven by a bichromatic external field is studied. We use a system of two coupled spin-12\frac{1}{2}21​ particles that can be translated into a three-state ladder model whose intermediate state represents the entangled state. We show that this entangled state can be prepared in a robust way with appropriate fields. Their frequencies and envelopes are derived from the topological properties of the model.
Schemes are presented for preparation for W state and high-dimensional entangled states of two atoms via adiabatic passage.In these schemes,since the quantum information is encoded in atomic ground states and the system always evolves in the dark state space so that there is no population in the atomic excited state,the atomic spontaneous emission is suppressed effectively.In addition,adiabatic passage insures that these schemes are robust to the fluctuation of the experimental parameter.Compared with previous proposals,our project saves effectively resources and can be experimentally realized more easily due to simpler operation.
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