# Quantum state preparation and macroscopic entanglement in gravitational-wave detectors

@article{MuellerEbhardt2009QuantumSP, title={Quantum state preparation and macroscopic entanglement in gravitational-wave detectors}, author={Helge Mueller-Ebhardt and Henning Rehbein and Chao Li and Yasushi Mino and Kentaro Somiya and Roman Schnabel and Karsten Danzmann and Yanbei Chen}, journal={Physical Review A}, year={2009}, volume={80}, pages={043802} }

Long-baseline laser-interferometer gravitational-wave GW detectors are operating at a factor of 10 in amplitude above the standard quantum limit SQL within a broad frequency band in the sense that f f. Such a low-noise budget has already allowed the creation of a controlled 2.7 kg macroscopic oscillator with an effective eigenfrequency of 150 Hz and an occupation number of 200. This result, along with the prospect for further improvements, heralds the possibility of experimentally probing… Expand

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