Deterministic Generation of Photon Pairs within the Bad Cavity Limit

TL;DR

This paper proposes a cavity QED setup for deterministic photon pair generation, analyzing its performance via scattering and master equations, and demonstrates its feasibility with superconducting circuits.

Contribution

It introduces a novel cavity QED configuration for efficient, deterministic photon pair production, connecting theoretical frameworks and practical implementation.

Findings

Identifies optimal parameters for photon pair generation.

Establishes a physical criterion for antibunched two-photon sources.

Shows feasibility with current superconducting circuit technology.

Abstract

The development, characterization and control of $N$-photon sources are instrumental for quantum technological applications. This work constitutes a step forward in this direction, where we propose a cavity quantum electrodynamics setup designed for the generation of photon pairs. We analyze it both via the scattering and master equation formalisms. From the connection between these two frameworks it naturally arises a physical criterion characterizing when weakly-driven systems behave as continuous antibunched two-photon sources. We find the optimal parameters for which our setup works as an efficient photon-pair source, showing also that it becomes a deterministic down-converter of single photons. We provide a specific implementation based on state-of-the-art superconducting circuits, showing how our proposal is within the reach of current technologies.