Injection locking of a trapped-ion phonon laser

Area of Science:

• Quantum mechanics
• Atomic physics
• Optomechanics

Background:

• Optically excited mechanical oscillations in trapped ions are a fundamental area of research.
• Understanding and controlling these oscillations is key to developing sensitive measurement techniques.

Purpose of the Study:

• To investigate the phenomenon of injection locking in optically excited mechanical oscillations of a single, trapped ion.
• To validate theoretical models of injection locking dynamics.

Main Methods:

• Utilizing a spatially selective Fourier transform technique to analyze the oscillator spectrum.
• Employing stroboscopic imaging to study the oscillator phase.

Main Results:

• Demonstrated successful injection locking of mechanical oscillations in a single trapped ion.
• Observed excellent agreement between experimental data and theoretical predictions for oscillator spectrum and phase.
• Achieved injection locking with exceptionally low forces (as low as 5(1)×10⁻²⁴ N).

Conclusions:

• The study successfully demonstrates injection locking of optically excited mechanical oscillations in a single trapped ion.
• The results show excellent agreement with theoretical models, validating the understanding of the locking dynamics.
• The system's sensitivity to ultraweak forces makes it a promising candidate for future force detection applications.