Generation of single and two-mode multiphoton states in waveguide QED

TL;DR

This paper presents protocols leveraging waveguide QED to generate high-fidelity single and two-mode multiphoton states, improving success probabilities over traditional linear optics methods.

Contribution

It introduces new protocols that utilize long-range atomic interactions in waveguide QED for efficient multiphoton state generation, including two-mode states like Yurke and NOON states.

Findings

Protocols achieve higher fidelities in multiphoton generation.

Extension to two-mode multiphoton states demonstrated.

Simplified requirements for implementation provided.

Abstract

Single and two-mode multiphoton states are the cornerstone of many quantum technologies, e.g., metrology. In the optical regime these states are generally obtained combining heralded single-photons with linear optics tools and post-selection, leading to inherent low success probabilities. In a recent paper, we design several protocols that harness the long-range atomic interactions induced in waveguide QED to improve fidelities and protocols of single-mode multiphoton emission. Here, we give full details of these protocols, revisit them to simplify some of their requirements and also extend them to generate two-mode multiphoton states, such as Yurke or NOON states.