Engineering Biphoton Wave Packets with an Electromagnetically Induced Grating

TL;DR

This paper presents a method to shape biphoton wave packets using an electromagnetically induced grating in a cold atomic system, enabling control over their spectral and angular properties without cavities.

Contribution

It introduces a novel scheme for biphoton waveform shaping via an electromagnetically induced grating in a four-level atomic system, highlighting new control capabilities.

Findings

Directed biphoton fields into different angular positions.

Achieved spectral broadening or narrowing without cavities.

Demonstrated control over two-photon waveforms.

Abstract

We propose to shape biphoton wave packets with an electromagnetically induced grating in a four-level double-$\Lambda$ cold atomic system. We show that the induced hybrid grating plays an essential role in directing the new fields into different angular positions, especially to the zeroth-order diffraction. A number of interesting features appear in the shaped two-photon waveforms. For example, broadening or narrowing the spectrum would be possible in the proposed scheme even without the use of a cavity.