Massachusetts Institute of Technology
"Quantum Noise Reduction in Advanced LIGO Using Squeezed Vacuum States"
Squeezed vacuum injection, also known as "squeezing", is an upgrade for Advanced LIGO that is currently underway. By injecting squeezed vacuum states through the dark port of the interferometer, quantum noise can be reduced. For this upgrade, the goal is to achieve a 3dB quantum noise reduction above 100 Hz, where shot noise limits the Advanced LIGO sensitivity.