Creating a switchable optical cavity with controllable quantum-state mapping between two modes

TL;DR

This paper proposes a method using a four-level atomic ensemble in a diamond configuration to create a controllable quantum-state mapping between two cavity modes, enabling dynamic control of quantum information transfer.

Contribution

It introduces a novel atomic configuration that allows for switchable coupling between cavity modes, facilitating on-demand quantum state mapping and coherent control of cavity systems.

Findings

Demonstrates controllable quantum-state mapping between two cavity modes.

Enables fast, coherent control of high-Q cavity systems.

Supports modes of different frequencies or polarisations.

Abstract

We describe how an ensemble of four-level atoms in the diamond-type configuration can be applied to create a fully controllable effective coupling between two cavity modes. The diamond-type configuration allows one to use a bimodal cavity that supports modes of different frequencies or different circular polarisations, because each mode is coupled only to its own transition. This system can be used for mapping a quantum state of one cavity mode onto the other mode on demand. Additionally, it can serve as a fast opening high-Q cavity system that can be easily and coherently controlled with laser fields.