Effects of the measurement power on states discrimination and dynamics in a circuit-QED experiment
arXiv:2310.04556 · doi:10.1103/PhysRevResearch.6.023299
Abstract
We explore the effects of driving a cavity at a large photon number in a circuit-QED experiment where the ``matter-like'' part corresponds to an unique Andreev level in a superconducting weak link. The three many-body states of the weak link, corresponding to the occupation of the Andreev level by 0, 1 or 2 quasiparticles, lead to different cavity frequency shifts. We show how the non-linearity inherited by the cavity from its coupling to the weak link affects the state discrimination and the photon number calibration. Both effects require treating the evolution of the driven system beyond the dispersive limit. In addition, we observe how transition rates between the circuit states (quantum and parity jumps) are affected by the microwave power, and compare the measurements with a theory accounting for the ``dressing'' of the Andreev states by the cavity.
Following remarks from referees, we have improved and simplified the presentation
References in corpus (14)
- Quantum feedback control of a superconducting qubit: Persistent Rabi oscillations
- Qubit-photon interactions in a cavity: Measurement induced dephasing and number splitting
- Dispersive regime of circuit QED: photon-dependent qubit dephasing and relaxation rates
- Quantum back-action of variable-strength measurement
- Demonstrating a Driven Reset Protocol of a Superconducting Qubit
- Widely tunable, non-degenerate three-wave mixing microwave device operating near the quantum limit
- Improved Superconducting Qubit Readout by Qubit-Induced Nonlinearities
- Response of the Strongly-Driven Jaynes-Cummings Oscillator
- Dynamics of Transmon Ionization
- Non-linear dispersive regime of cavity QED: The dressed dephasing model
- Measurement-Induced State Transitions in a Superconducting Qubit: Within the Rotating Wave Approximation
- Signatures of interactions in the Andreev spectrum of nanowire Josephson junctions
- From adiabatic to dispersive readout of quantum circuits
- Intrinsic mechanisms for drive-dependent Purcell decay in superconducting quantum circuits