Switchable selective interactions in a Dicke Model with Driven Biased term

TL;DR

This paper introduces a method to control qubit-resonator interactions in a driven Dicke model, enabling the creation of Dicke states and studying nonlinearity effects, with potential applications in quantum state engineering.

Contribution

It presents a novel approach to manipulate qubit-resonator interactions via frequency modulation in a Dicke model, including analysis of nonlinearity and state preparation.

Findings

Controllable switching of interactions by adjusting modulation parameters

Creation of Dicke states and superpositions using the proposed method

Identification of Kerr-type nonlinearity in the thermodynamic limit

Abstract

In this work, we propose a method to investigate controllable qubit-resonator interactions in a Dicke model with driven biased term. The nonlinearity of spectrum, which can be induced by qubit-resonator interactions, plays an important role in such controllable interactions. To gain insight into mechanism of the nonlinearity, we perform a unitary transformation to the Hamiltonian. The results show that the nonlinearity of the transformed Hamiltonian depends on the qubit-resonator coupling strength. The general forms of the effective Hamiltonians are discussed in detail based on the frequency modulation approach. The dynamical evolution can be switched on and off by adjusting the modulation parameters. By utilizing such controllable interactions, we discuss the creation of Dicke states and arbitrary superposition of Dicke states. We also consider the nonlinearity of energy level for the limit of large qubit numbers. In the thermodynamics limit, the kerr type nonlinearity is induced from "magnon"-resonator coupling, and the selective preparation of "magnon" Fock states can be studied under "magnon" scenario.