Amplitude and phase effects in Josephson qubits driven by a biharmonic electromagnetic field

TL;DR

This paper studies how biharmonic electromagnetic fields influence Josephson qubits, revealing effects on energy levels, transitions, and population interference, which could aid in qubit control and pulse calibration.

Contribution

It demonstrates the significant impact of biharmonic driving on qubit energy levels, transitions, and population dynamics, offering new methods for qubit manipulation.

Findings

Biharmonic fields affect quasi-energy level crossing.

Interference patterns depend on signal parameters.

Potential applications in qubit control and pulse calibration.

Abstract

We investigate the amplitude and phase effects of qubit dynamics and excited-state population under the influence of a biharmonic control field. It is demonstrated that the biharmonic driving field can have a significant effect on the behavior of quasi-energy level crossing as well as on multiphoton transitions. Also, the interference pattern for the populations of qubit excited states is sensitive to the signal parameters. We discuss the possibility of using these effects for manipulating qubit states and calibrating nanosecond pulses.