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理论物理通讯：英文版

Atomic GHZ States Prepared in Two Directly Coupled Cavities with Virtual Excitations in One Step

杨榕灿, 黄志平, 郭强, 张鹏飞, 钟纯勇, 张天才

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

A scheme for one-step preparation of atomic GHZ states in two directly coupled cavities via virtual excitations is proposed.In the whole procedure,the information is carried only in two ground states of A-type atoms, while the excited states of atoms and cavity modes are virtually excited,leading the system to be insensitive to atomic spontaneous emission and photon loss.更多还原

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We propose a one-step scheme for driving many atoms into a NOON state. In this scheme, two cavities are coupled to each other through the photon-hopping interaction and each cavity contains N four-level atoms. The 2 N atoms are driven into a NOON state via a phase-shift which depends on the collective atomic excitations. Interestingly, the time of generating the NOON state is independent of the atom number, i.e., it is unchanged with the increasing of the atom number. Also, our scheme is insensitive to cavity decay and can effectively suppress atomic spontaneous emission.