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We demonstrate a novel method for creating mechanical entanglement in coupled optomechanical systems using optical parametric amplifiers (OPAs). This technique achieves strong macroscopic entanglement between mirrors, robust against noise and decay.

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Area of Science:

Quantum mechanics
Optomechanics
Quantum entanglement

Background:

Cavity optomechanical systems are crucial for exploring quantum phenomena.
Generating and controlling mechanical entanglement is a key challenge in quantum science.

Purpose of the Study:

To develop an efficient mechanism for generating mechanical entanglement in a two-cascaded cavity optomechanical system.
To investigate the role of optical parametric amplifiers (OPAs) in achieving macroscopic entanglement.

Main Methods:

Utilizing specially tuned OPAs within coupled cavities to squeeze a hybrid mechanical mode.
Modulating squeezing parameters and effective mechanical damping via OPA gains.
Analyzing the interplay between coherent squeezing and dissipation engineering.

Main Results:

Achieved strong macroscopic entanglement between two movable mirrors.
Demonstrated that entanglement is robust against significant cavity decay and thermal noise.
Showcased the tunability of entanglement through OPA gain control.

Conclusions:

The proposed scheme offers an efficient and robust method for generating mechanical entanglement.
This approach provides an alternative pathway for creating macroscopic entanglement in cascaded optomechanical systems.
The findings advance the understanding of quantum control in complex optomechanical setups.