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Journal of Fujian Normal University

Preparing Cluster States Via Adiabatic Evolution

Zhuang Wei-hai

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

A scheme for the implementation of cluster states via adiabatic evolution is proposed.In the scheme,the quantum information is stored in the ground states of the multiple-level ions instead of the vibrational mode.Moreover,the decoherence and the instability of the parameter of the experiment are suppressed during the whole procedure since the system is always in the dark states.The present scheme is feasible based on current technologies.

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Chinese Journal of Quantum Electronics•Jan 1, 2011•0 citations
A scheme for the implementation of cluster states via adiabatic evolution is proposed.In the scheme,the quantum information is stored in the ground states of the multiple-level ions instead of the vibrational mode.Moreover,the decoherence and the instability of the parameter of the experiment are suppressed during the whole procedure since the system is always in the dark states.The present scheme is feasible based on current technologies.
We propose a scheme to generate atomic cluster states of arbitrary configuration in the cavity quantum electrodynamics (QED) system. The process is achieved via adiabatic evolution of dark states, which only requires adiabatically increasing or decreasing Rabi frequencies of laser. Thus it allows the robust implementation of entanglement against certain types of errors. Our scheme is relatively decoherence-free in the sense that excited atomic states are never populated and excited cavity photon states can be made negligible in certain conditions.
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.
Three experimentally feasible schemes are proposed for generating multipartite entangled states of cold trapped ions.In the first scheme,a GHZ state can be simply synthesized in a single step. The second scheme is to prepare fully symmetric W states with two steps.The third scheme describes the sequential generation of linear cluster states.In addition,a method to create a larger cluster state was also presented by fuzing the end qubits of two smaller cluster states in order to decrease the distortion caused by decoherence,which can speed up the generation of large cluster states.The above schemes involve the collective interaction between multiple ions with the vibrational ground state and a large detuned laser. Compared with previous schemes,the above schemes have four advantages.Firstly,they do not require the vibrational mode of ions as memory.Secondly,they do not need to address the ions individually.Thirdly, they are free from the effects of phase fluctuation of laser field.Finally,they need less operations.