Coherent Rabi response of a charge-phase qubit under microwave irradiation

Abstract

We report on radio-frequency measurements of the charge-phase qubit being under continuous microwave irradiation in the state of weak coupling to a radio-frequency tank circuit. We studied the rf impedance dependence on the two important parameters such as power of microwave irradiation whose frequency is close to the gap between the two lowest qubit energy levels, and temperature of the internal heat bath. We have found that backaction effects of the qubit on the rf tank, and vice versa, tank on the qubit, lead to a negative as well as a positive real part of the qubit impedance Re$Z(\omega )$ seen by the tank. We have implemented noise spectroscopy measurements for direct impedance readout at the extreme points corresponding to maximum voltage response and obtained absolute values of about 0.017 $\Omega$ for the negative and positive Re$Z(\omega )$. Our results demonstrate the existence and persistence of the coherent single- and multi-photon Rabi dynamics of the qubit with both negative and positive dynamic resistance inserted into the tank in the temperature range of 10 to 200 mK.

11 pages, 9 figures

References in corpus (12)

• Quantum non-demolition measurement of a superconducting two-level system
• Single-qubit lasing and cooling at the Rabi frequency
• Sisyphus cooling and amplification by a superconducting qubit
• Consistency of ground state and spectroscopic measurements on flux qubits
• Multiphoton transitions in a macroscopic quantum two-state system
• Measuring the Decoherence of a Quantronium Qubit with the Cavity Bifurcation Amplifier
• Parametric control of a superconducting flux qubit
• Rabi-type oscillations in a classical Josephson junction
• A Fully Quantum Mechanical Model of a SQUID Ring Coupled to an Electromagnetic Field
• Reading-out the state inductively and microwave spectroscopy of an interferometer-type charge qubit
• Resonant excitations of single and two-qubit systems coupled to a tank circuit
• Quantum theory of the low-frequency linear susceptibility of interferometer-type superconducting qubits

Cited by in corpus (4)

• Landau-Zener-Stuckelberg interferometry
• Inverse Landau-Zener-Stuckelberg problem for qubit-resonator systems
• Multiphoton transitions in Josephson-junction qubits (Review Article)
• Rabi-vibronic resonance with large number of vibrational quanta