Mechanical squeezing in an active-passive-coupled double-cavity optomechanical system via pump modulation

Area of Science:

• Quantum Optics
• Optomechanics
• Quantum Information Science

Background:

• Optomechanical systems are crucial for studying quantum phenomena.
• Parity-time (PT)-symmetry offers unique properties in coupled systems.
• Generating robust mechanical squeezing is vital for quantum technologies.

Purpose of the Study:

• To investigate mechanical squeezing generation in a PT-symmetric active-passive coupled optomechanical system.
• To analyze the stability and robustness of the system against thermal noise.
• To explore the potential for surpassing the 3 dB squeezing limit.

Main Methods:

• Utilizing a periodically amplitude-modulated laser to drive the optomechanical system.
• Numerical analysis to determine system stability in different PT-symmetry regimes (unbroken and broken).
• Comparing squeezing performance in active-passive versus passive-passive configurations.

Main Results:

• The system exhibits greater stability in the unbroken PT-symmetry regime.
• Mechanical squeezing in the active-passive system is more robust to thermal noise than in passive-passive systems.
• The 3 dB squeezing limit can be overcome in the resolved-sideband regime.
• Stronger mechanical squeezing is achieved in the unbroken PT-symmetry region.

Conclusions:

• PT-symmetric optomechanical systems offer enhanced and robust mechanical squeezing.
• This work contributes to quantum state engineering and the study of PT-symmetric physics in quantum regimes.
• The findings have implications for developing advanced quantum technologies.