Quantum technologies and the Einstein Telescope

Friday 14 Jul 2023, 11:00 → 12:30 Europe/Rome

Aula Conversi (Dip. di Fisica - edificio G. Marconi)

 

Quantum technologies for improving the sensitivity of the Einstein Telescope

ore 11.00

Byeong-Yoon Go

(Korea Advanced Institute of Science and Technology)

 

Squeezed light, being a basic quantum resource for continuous-variable quantum techniques, offers a practical approach to improve sensitivity for gravitational wave (GW) detectors. By injecting squeezed light into such detectors, quantum noise can be significantly decreased beyond the limits imposed by the shot noise. Moreover, manipulating frequency-dependent squeezing angles allows the reduction of quantum noise also in the low-frequency region, where the sensitivity is limited by the radiation pressure noise of light. 

Currently, 1550 nm wavelength of light is considered as a strong candidate for a new probe light for the third-generation GW detectors such as the Einstein Telescope (ET). Indeed, that choice is related to the adoption of silicon cryogenic mirror test masses.       
Accordingly, the development of a squeezed light source at the 1550 nm wavelength is required. 
In this talk, after a brief introduction on how squeezed light in GW is used to reduce quantum noise, I will describe the 1550 nm squeezed light source that we have developed at KAIST (Korean Advanced Institute of Science and Technology).     

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A novel strategy for quantum noise reduction in Gravitational Wave detectors: the EPR squeezing

ore 11.30

Sumin Lee

(Kyung Hee University)

 

During the run O4, gravitational wave (GW) detectors will attain broadband Quantum Noise reduction through Frequency-Dependent Squeezing (FDS), by coupling the main interferometer to a 300m-long Filter Cavity (FC), whose construction required quite huge infrastructure works. Due to the increased arm length, km-long FCs will be needed in 3rd generation GW detectors. Currently, we are developing at European Gravitational Observatory (EGO) a table-top optical prototype aiming at testing an alternative technique to achieve FDS with a more compact and flexible setup than the currently used FC scheme. The EPR (Einstein Podolsky Rosen) squeezing team involves many Italian universities and INFN branches such as: Roma, Napoli, Perugia and Genova. In 2019 the Korea Astronomy and Space Science Institute also started to contribute to the EPR experiment. In particular, during this visit in Italy, I am in charge of installing the Mode Matching Telescope that we have designed, produced and tested in Korea. 

After a very brief introduction on the EPR conditional squeezing, the current status of the EPR experiment at EGO will be presented.