Quantum tunneling and level crossings in the squeeze-driven Kerr oscillator

Understand

The quasi-energy spectrum recently measured in experiments with a squeeze-driven superconducting Kerr oscillator showed good agreement with the energy spectrum of its corresponding static effective Hamiltonian.

• The experiments also demonstrated that the dynamics of low-energy states can be explained with the same emergent static effective model.
• The spectrum exhibits real (avoided) level crossings for specific values of the Hamiltonian parameters, which can then be chosen to suppress (enhance) quantum tunneling.
• Here, we analyze the spectrum and the dynamics of the effective model up to high energies, which should soon be within experimental reach.