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Physical Review A

Storage and switching of multiple optical signals among three channels

Xiaoli Song, Aijun Li, Lei Wang, Zhi‐Hui Kang, Jun Kou, Bing Zhang, Chun-Liang Wang, Yun Jiang, Jin-Yue Gao

Published May 29, 2009• 6 citations
Publisher

Abstract

We experimentally and theoretically demonstrate that multioptical signals can be effectively stored and retrieved by fractional stimulated Raman adiabatic passage technique in a tripod-type four-level $^{87}\text{R}\text{b}$ atomic system. The optical pulses stored can be controllably released into two of the three different channels. The restored pulses have the same frequency, polarization, and propagation direction as the writing pulses. The experimental results fit very well with the numerical simulations.

DOI
10.1103/physreva.79.053857

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We propose a method using ``light storage'' and fractional stimulated Raman adiabatic passage (F-STIRAP) to get entangled multiple Fock states from a single photon. A light storage technique is used to store the quantum information of a single-photon pulse in atoms. F-STIRAP pulses then split the stored coherence, such that reading pulses retrieve the quantum information from this new coherence. Since each reading pulse only retrieves part of the total coherence, we can obtain entangled multiple Fock states with arbitrary relative amplitude. This method to create entanglement is versatile for obtaining frequency, time, and∕or spatial entanglement. Indeed, we obtain a multiple beam splitter with easily adjustable parameters.