Eur. Phys. J. D 30, 425-429 (2004)
https://doi.org/10.1140/epjd/e2004-00097-y

Quantum memory based on Λ-atoms ensemble with two-photon resonance EIT

¹ Interdisciplinary Center of Theoretical Studies, Chinese Academy of Sciences, Beijing 100080, China
² Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China

Corresponding authors: ^a liyong@itp.ac.cn - ^b suncp@itp.ac.cn

Received: 3 March 2004
Revised: 8 June 2004
Published online: 10 August 2004

Abstract

We study the Λ-atoms ensemble based quantum memory for the quantum information carried by a probe light field. Two atomic Rabi transitions of the ensemble are coupled to the quantum probe field and classical control field respectively with a same detuning. Our analysis shows that the dark states and dark-state polaritons can still exist for the present case of two-photon resonance EIT. Starting from these dark states we can construct a complete class of eigen-states of the total system. A explicit form of the adiabatic condition is also given in order to achieve the memory and retrieve of quantum information.