Fig. 1: Schematic of the reset process and diagram of the device.
From: Rapid and unconditional parametric reset protocol for tunable superconducting qubits
a Jaynes-Cummings ladder diagram of the qubit-resonator coupled system. \(\left|g\right\rangle\), \(\left|e\right\rangle\) and \(\left|0\right\rangle\), \(\left|1\right\rangle\) denote the qubit and resonator lowest two states respectively. The dashed light red circle represents one of the sideband modes induced by the parametric modulation. The dashed arrow labeled κr illustrates the decay process of the resonator. b Simplified circuit diagram of the chip. Each transmon qubit is coupled to a readout resonator and an individual Purcell filter. The readout signal is amplified by an impedance-matched Josephson parametric amplifier (IMPA). c Typical transmon resonance frequency ωq with respect to the flux bias. The reset pulse is generated by AWG. After 30 dB attenuation, it is added to the flux control line. The qubit’s frequency modulation (brown) activates effective coupling between the qubit and its readout resonator and facilitates the reset process. Two cases are depicted: (1) operation point at or near the sweet spot (cyan, main text); (2) operation point away from the sweet spot (orange, Supplementary Note 5).
