Frequency-Dependent Squeezed Vacuum Source for the Advanced Virgo Gravitational-Wave Detector

authored by
The Virgo Collaboration , F. Acernese, M. Agathos, A. Ain, S. Albanesi, C. Alléné, A. Allocca, A. Amato, C. Amra, M. Andia, T. Andrade, N. Andres, M. Andrés-Carcasona, T. Andrić, S. Ansoldi, S. Antier, T. Apostolatos, E. Z. Appavuravther, M. Arène, N. Arnaud, M. Assiduo, S. Assis de Souza Melo, P. Astone, F. Aubin, S. Babak, F. Badaracco, S. Bagnasco, J. Baird, T. Baka, G. Ballardin, G. Baltus, B. Banerjee, P. Barneo, F. Barone, M. Barsuglia, D. Barta, A. Basti, M. Bawaj, M. Bazzan, F. Beirnaert, M. Bejger, V. Benedetto, M. Berbel, S. Bernuzzi, D. Bersanetti, A. Bertolini, U. Bhardwaj, S. Danilishin, H. Vahlbruch, H. Lück, K. Danzmann

In this Letter, we present the design and performance of the frequency-dependent squeezed vacuum source that will be used for the broadband quantum noise reduction of the Advanced Virgo Plus gravitational-wave detector in the upcoming observation run. The frequency-dependent squeezed field is generated by a phase rotation of a frequency-independent squeezed state through a 285 m long, high-finesse, near-detuned optical resonator. With about 8.5 dB of generated squeezing, up to 5.6 dB of quantum noise suppression has been measured at high frequency while close to the filter cavity resonance frequency, the intracavity losses limit this value to about 2 dB. Frequency-dependent squeezing is produced with a rotation frequency stability of about 6 Hz rms, which is maintained over the long term. The achieved results fulfill the frequency dependent squeezed vacuum source requirements for Advanced Virgo Plus. With the current squeezing source, considering also the estimated squeezing degradation induced by the interferometer, we expect a reduction of the quantum shot noise and radiation pressure noise of up to 4.5 dB and 2 dB, respectively.

QUEST-Leibniz Research School
Institute of Gravitation Physics
External Organisation(s)
Max Planck Institute for Gravitational Physics (Albert Einstein Institute)
Physical review letters
Publication date
Publication status
Peer reviewed
ASJC Scopus subject areas
Physics and Astronomy(all)
Electronic version(s) (Access: Open)