Single-qubit lasing and cooling at the Rabi frequency.

Area of Science:

• Quantum Optics
• Superconducting Circuits
• Quantum Information Science

Background:

• Superconducting qubits are key components in quantum computing.
• Understanding qubit-oscillator interactions is crucial for quantum control.
• Rabi oscillations are fundamental to qubit manipulation.

Purpose of the Study:

• To explore novel quantum optics phenomena in a driven superconducting qubit-oscillator system.
• To investigate the effects of resonant driving on qubit-oscillator dynamics.
• To identify conditions for achieving exotic behaviors like population inversion and lasing.

Main Methods:

• Theoretical analysis of a superconducting qubit coupled to a slow oscillator.
• Modeling Rabi oscillations and resonant driving conditions.
• Investigating both blue and red detuned driving scenarios.
• Analyzing behavior at the quadratic coupling symmetry point.

Main Results:

• The oscillator can be driven far from equilibrium when the Rabi frequency is resonant.
• Blue detuning induces qubit population inversion and oscillator bistability with lasing.
• Red detuning leads to the qubit cooling the oscillator.
• The system exhibits unique behavior at the symmetry point, minimizing decoherence.

Conclusions:

• The superconducting qubit-driven oscillator system demonstrates unexplored quantum optics effects.
• This system can function as a "single-atom-two-photon laser" under specific conditions.
• The findings offer new avenues for quantum control and novel quantum devices.