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Area of Science:

  • Quantum Electromechanics
  • Superconducting Circuits
  • Nanoscale Oscillators

Background:

  • Micromechanical oscillators are crucial for sensing applications.
  • Superconducting qubits offer precise quantum control.
  • Integrating these systems presents challenges in coupling and detection.

Purpose of the Study:

  • To directly detect and control the energy of a micromechanical oscillator using a superconducting qubit.
  • To explore quantum nondemolition measurements and nonclassical state preparation.
  • To investigate the nonlinear interaction between a qubit and an oscillator.

Main Methods:

  • Utilizing the intrinsic nonlinearity of a microwave superconducting qubit (4 GHz).
  • Electrostatic coupling between the qubit and a 25 MHz micromechanical oscillator.
  • Analyzing qubit frequency shifts to determine oscillator phonon number distribution.

Main Results:

  • Qubit frequency shifts by 0.52 MHz per oscillator phonon.
  • Extracted phonon number distribution from qubit lineshape.
  • Created nonthermal states by manipulating oscillator energy levels.
  • Cooled the oscillator, increasing ground state population by a factor of 8.

Conclusions:

  • Demonstrated a novel electromechanical system for quantum control.
  • The qubit acts as a sensitive vibrational energy detector.
  • This approach is promising for quantum nondemolition measurements and nonclassical state generation.