Parametric amplification and back-action noise squeezing by a qubit-coupled nanoresonator

Area of Science:

• Quantum physics
• Nanotechnology
• Quantum computing

Background:

• Nanomechanical systems exhibit motion sensitive to quantum effects.
• Controlling and reducing noise in nanomechanical motion is crucial for quantum technologies.
• Cooper-pair box qubits offer a platform for precise quantum control.

Purpose of the Study:

• To demonstrate parametric amplification of nanomechanical motion using a Cooper-pair box qubit.
• To achieve noise squeezing in nanomechanical motion via qubit coupling.
• To explore the potential for preparing nanomechanical squeezed states.

Main Methods:

• Utilizing dispersive coupling between a nanomechanical resonator and a Cooper-pair box qubit.
• Modulating the qubit bias to induce a mechanical resonance shift.
• Measuring the effects of qubit-mediated coupling on mechanical motion.

Main Results:

• Achieved parametric amplification with 30 dB gain.
• Demonstrated 4 dB noise squeezing of nanomechanical motion.
• Qubit-mediated effect found to be 3000 times more effective than conventional methods.

Conclusions:

• Parametric amplification and noise squeezing of nanomechanical motion are feasible using Cooper-pair box qubits.
• This qubit-mediated approach significantly enhances control over nanomechanical systems.
• The technique holds promise for the generation of nanomechanical squeezed states.