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International Journal of Theoretical Physics

Remote Preparation of an Arbitrary Two-atom State in the Cavity QED

Jianping Li

Published Jun 28, 2016• 3 citations
Publisher
DOI
10.1007/s10773-016-3092-x

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In this paper, we propose three schemes for remotely state preparation (RSP) an arbitrary two-level one-atom state via cavity quantum electro dynamics (QED) with minimal resources consumption. In the first case, a Greenberger–Horne–Zeilinger (GHZ) state is used as quantum channel; in the second case, the sender needs to construct an quantum channel with both of the assistant of cavity QED and the knowledge about the state to be remotely prepared. In each scheme, only 1 cbit and 1 ebit are needed with the aid of cavity QED. In the third case, we combine the first two protocols and give a theoretical proposal for controlled RSP with only 2 cbits and 1 ebit resources consumption.
Using the highly detuned interaction between three-level Λ-type atom and coherent optical field,we can get the maximally entangled state between the atom and the coherent optical field.With the help of a Ramsey zone and this prepared quantum channel an arbitrary superposition of a pair of coherent states can be remotely prepared freely in cavity QED.The possibility for a successful preparation is 100%when the superposition coefficients are real.The experimental feasibility and the advantage of applications are also discussed.