Deterministic multi-mode photonic device for quantum information processing

TL;DR

This paper proposes a deterministic multi-mode photonic device that encodes quantum states in atomic ensembles and converts them into multi-mode photonic states, enabling advanced quantum information processing tasks.

Contribution

It introduces a novel method for generating complex multi-mode quantum states deterministically using atomic ensembles and cooperative emission.

Findings

Two-photon entangled states can be prepared for quantum key distribution.

The device can produce one-dimensional and higher-dimensional cluster states.

The approach enables deterministic generation of multi-mode quantum states.

Abstract

We propose the implementation of a light source, which can deterministically generate a rich variety of multi-mode quantum states. The desired states are encoded in the collective population of different ground hyperfine states of an atomic ensemble and converted to multi-mode photonic states by excitation to optically excited levels followed by cooperative spontaneous emission. Among our examples of applications, we demonstrate how two-photon entangled states can be prepared and implemented in a protocol for reference frame free quantum key distribution and how one-dimensional as well as higher-dimensional cluster states can be produced.