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Probing quantum entanglement with macroscopic objects allows to test quantummechanics in new regimes. One way to realize such behavior is to couple amacroscopic mechanical oscillator to a continuous light field via radiationpressure. In view of this, the system that is discussed comprises anoptomechanical cavity driven by a coherent optical field in the unresolvedsideband regime where we assume Gaussian states and dynamics. We develop aframework to quantify the amount of entanglement in the system numerically.Different from previous work, we treat non-Markovian noise and take intoaccount both the continuous optical field and the cavity mode. We apply ourframework to the case of the Advanced Laser Interferometer Gravitational-WaveObservatory (Advanced LIGO) and discuss the parameter regimes whereentanglement exists, even in the presence of quantum and classical noises.

Macroscopic quantum entanglement between an optomechanical cavity and a continuous field in presence of non-Markovian noise