Photonic spectral density of coupled microwave cavities

TL;DR

This paper investigates the spectral properties of two coupled anharmonic microwave cavities connected by an optical fiber, revealing that anharmonicity minimally affects the spectral density which exhibits a Gaussian envelope at high photon numbers.

Contribution

It introduces a study of the photonic spectral density in coupled microwave cavities, showing that anharmonicity does not significantly alter spectral features.

Findings

Spectral density has a Gaussian envelope for large photon numbers.

Anharmonicity has negligible effect on spectral properties.

Recursive projection method effectively evaluates spectral density.

Abstract

We study a pair of anharmonic microwave cavities that is connected by an optical fiber. The photonic spectral density characterizes the evolution of the coupled cavities after the system has been prepared in a Fock or N00N state. We evaluate the photonic spectral density within the recursive projection method and find that the anharmonicity has no substantial effect on the spectral properties. In all cases the photonic spectral density has a Gaussian envelope for large photon numbers.