2012/06/30 by A. Ridolfo, Alessandro Ridolfo, Martin Leib +2 · 3 citations
Computer Science · Physics and Astronomy · #Atomic physics #Cascade #Coincidence #Coupling (piping) #Parametric oscillator #Parametric statistics #Photon #Physics #Quantum Information and Cryptography #Quantum electrodynamics #Quantum mechanics #Quantum optics and atomic interactions #Resonance (particle physics) #Statistics #Strong Light-Matter Interactions #quant-ph
paper · pdf · doi:10.1103/physrevlett.109.193602
published as Phys. Rev. Lett. 109, 193602 (2012) · minor revisions, supplementary information added, accepted for publication in PRL
arxiv created 2012/10/08 · openalex publication_date 2012/11/08 · arxiv updated 2015/06/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We explore photon coincidence counting statistics in the ultrastrong coupling regime, where the atom-cavity coupling rate becomes comparable to the cavity resonance frequency. In this regime, usual normal order correlation functions fail to describe the output photon statistics. By expressing the electric-field operator in the cavity-emitter dressed basis, we are able to propose correlation functions that are valid for arbitrary degrees of light-matter interaction. Our results show that the standard photon blockade scenario is significantly modified for ultrastrong coupling. We observe parametric processes even for two-level emitters and temporal oscillations of intensity correlation functions at a frequency given by the ultrastrong photon emitter coupling. These effects can be traced back to the presence of two-photon cascade decays induced by counterrotating interaction terms.