Tunable photon-photon correlations in waveguide QED systems with giant atoms

Abstract

We investigate the scattering processes of two photons in a one-dimensional waveguide coupled to two giant atoms. By adjusting the accumulated phase shifts between the coupling points, we are able to effectively manipulate the characteristics of these scattering photons. Utilizing the Lippmann-Schwinger formalism, we derive analytical expressions for the wave functions describing two-photon interaction in separate, braided, and nested configurations. Based on these wave functions, we also obtain analytical expressions for the incoherent power spectra and second-order correlation functions. In contrast to small atoms, the incoherent spectrum, which is defined by the correlation of the bound state, can exhibit more tunability due to the phase shifts. Additionally, the second-order correlation functions in the transmission and reflection fields could be tuned to exhibit either bunching or antibunching upon resonant driving. These unique features offered by the giant atoms in waveguide QED could benefit the generation of nonclassical itinerant photons in quantum networks.

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Cited by in corpus (4)

• Non-Markovian dynamics with a driven three-level giant atom in a semi-infinite photonic waveguide
• Simulating and probing many-body quantum states in waveguide-QED systems with giant atoms
• Harnessing spontaneous emission of correlated photon pairs from ladder-type giant atoms
• Giant atoms coupled to waveguide: Continuous coupling and multiple excitations