Work

Effective Hamiltonian for an off-resonantly driven qubit-cavity system

Year: 2026

Type: article

Abstract: Accurate modeling of driven light-matter interactions is essential for quantum technologies, where natural and synthetic atoms are used to store and process quantum information, mediate interactions between bosonic modes, and enable nonlinear operations. In systems subject to multitone drives, however, the theoretical description becomes challenging and existing models cannot quantitatively reproduce the experimental data. Here, we derive an effective Hamiltonian that retains slowly rotating terms, providing a general framework for accurately describing driven dynamics across platforms. As a concrete application, we validate the theory in circuit QED, where it quantitatively reproduces experimentally measured ac Stark shifts and captures key interactions such as two-mode squeezing and beam splitting. Our results establish a broadly applicable tool to engineer driven interactions in quantum information processing platforms.

Source: Physical Review A

DOI: 10.1103/y7xr-jq5w

Authors: Martin Jirlow, Kunal Helambe, Axel M. Eriksson, Simone Gasparinetti, Tahereh Abad

Institution: Chalmers University of Technology

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,675

Funders: Knut och Alice Wallenbergs Stiftelse, European Research Council