Frequency combs with parity-protected cross-correlations from dynamically modulated qubit arrays

TL;DR

This paper presents a theoretical framework for engineering quantum frequency combs with controlled photon correlations using dynamically modulated superconducting qubit arrays, enabling simultaneous photon bunching and antibunching.

Contribution

It introduces a universal method to manipulate two-particle correlations via temporal modulation of qubit resonance frequencies, including phase-shifted modulation.

Findings

Achieves simultaneous photon bunching and antibunching in cross-correlations.

Demonstrates control over quantum correlations through frequency modulation.

Provides a general approach applicable to various dissipative quantum systems.

Abstract

We develop a general theoretical framework to dynamically engineer quantum correlations in the frequency-comb emission from an array of superconducting qubits in a waveguide, rigorously accounting for the temporal modulation of the qubit resonance frequencies. We demonstrate, that when the resonance frequencies of the two qubits are periodically modulated with a $\pi$ phase shift, it is possible to realize simultaneous bunching and antibunching in cross-correlations of the scattered photons from different sidebands. Our approach, based on the dynamical conversion between the quantum excitations with different parity symmetry, is quite universal. It can be used to control two-particle correlations in generic dynamically modulated dissipative quantum systems.