Structural instability of driven Josephson circuits prevented by an inductive shunt

Understand

Superconducting circuits are a versatile platform to implement a multitude of Hamiltonians which perform quantum computation, simulation and sensing tasks.

• A key ingredient for realizing a desired Hamiltonian is the irradiation of the circuit by a strong drive.
• These strong drives provide an in-situ control of couplings, which cannot be obtained by near-equilibrium Hamiltonians.
• However, as shown in this paper, out-of-equilibrium systems are easily plagued by complex dynamics leading to instabilities.