Speaker
Description
Quantum noise limits the sensitivity of gravitational-wave detectors over a broad frequency band. A promising technique to reduce this noise is the injection of frequency-dependent squeezed states. In current detectors such as LIGO, this is achieved using a filter cavity. However, the Einstein Telescope (ET) employs a detuned interferometer configuration, for which implementing frequency-dependent squeezing would require kilometer-scale filter cavities installed underground, posing significant technical and economic challenges.
A recently proposed scheme addresses this issue by generating frequency-dependent squeezing using quantum teleportation. This approach avoids the need for additional filter cavities and allows the interferometer itself to act as a frequency-dependent filter. However, frequency-dependent squeezing optimized for detuned interferometer configurations has not yet been experimentally demonstrated.
In this study, we take an experimental step toward demonstrating this scheme. We construct an experimental setup that reproduces the frequency response of a detuned interferometer using two test cavities. In this presentation, we describe the experimental method, the current experimental setup, and recent progress toward the realization of teleportation-based frequency-dependent squeezing.