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Chinese Physics

Quantum state transfer via adiabatic passage

Chen Mei-Ying, Xiu‐Min Lin, Zhihua Chen

Published Jan 24, 2007• 2 citations
Publisher

Abstract

Based on adiabatic passage, we propose a scheme for implementing the quantum transfer of an unknown atomic state. In our scheme, we utilize photons for ideal quantum transmission between two cavities with the successful probability being about 1. Meanwhile, the scheme is robust against the effects of atomic spontaneous emission. It may be useful for transferring quantum information among spatially distant atoms.

DOI
10.1088/1009-1963/16/2/022

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Based on adiabatic passage, we propose a scheme for implementing the quantum transfer of an unknown atomic state. In our scheme, we utilize photons for ideal quantum transmission between two cavities with the successful probability being about 1. Meanwhile, the scheme is robust against the effects of atomic spontaneous emission. It may be useful for transferring quantum information among spatially distant atoms.
We propose a relatively robust scheme to implement quantum information transfer via adiabatic passage.When a Λ-type atom interacts with laser and cavity fields adiabatically,the state of the system evolves in a dark state.By the adiabatic passage,we can implement quantum information transfer of all the atomic states.Similarly,the scheme can be used to transfer a cavity mode state.The proposal is robust to restrain the atomic spontaneous emission noise,and transfers quantum information successfully.
Based on adiabatic passage,transfers of an unknown state of one atom,entangled state of two-atom and GHZ state are realized,where only one vacuum-cavity is needed.In these schemes,since the quantum information is encoded in atomic ground states,the system evolves in the dark state space,and there is no population in the atomic excited state,atomic spontaneous emission is suppressed effectively.Compared with previous proposals,the schemes need less resource and easier operation.In addition,the feasibility for experiment is discussed.
A scheme is presented to realize transfer of a three-dimensional quantum state between two atoms trapped in distant cavities connected by an optical fiber, whose mode is resonant with the polarization cavity modes. Performing an adiabatic passage along dark states, the fiber mode remains in the vacuum state and the population of the cavities being excited can be negligible under certain conditions. In addition, atomic transitions in our scheme are largely detuned from cavity modes. As a consequence, the atomic spontaneous emission and the fiber decay can be effectively eliminated. Furthermore, we give some discussions about the fidelity of our scheme.