Bichromatic field generation from double-four-wave mixing in a double-electromagnetically induced transparency system

TL;DR

This paper presents a novel scheme for generating bichromatic fields using double-EIT and double-FWM in cold rubidium atoms, enhancing nonlinear interactions for quantum information applications.

Contribution

It introduces a new non-degenerate four-wave mixing scheme involving five atomic levels, enabling simultaneous phase-matched generation of bichromatic fields.

Findings

Successful demonstration of double-EIT and double-FWM in cold rubidium atoms.

Generation of bichromatic fields with a frequency difference of 3 GHz.

Results align well with theoretical simulations.

Abstract

We demonstrate the double electromagnetically induced transparency (double-EIT) and double four-wave mixing (double-FWM) based on a new scheme of non-degenerate four-wave mixing (FWM) involving five levels of a cold 85Rb atomic ensemble, in which the double-EIT windows are used to transmit the probe field and enhance the third-order nonlinear susceptibility. The phase-matching conditions for both four-wave mixings could be satisfied simultaneously. The frequency of one component of the generated bichromatic field is less than the other by the ground-state hyperfine splitting (3GHz). This specially designed experimental scheme for simultaneously generating different nonlinear wave-mixing processes is expected to find applications in quantum information processing and cross phase modulation. Our results agree well with the theoretical simulation.