We present a novel type of direct detector for axions and axion-like particles. Our approach utilizes a high-finesse optical cavity, where the polarization axis of a linearly polarized laser beam undergoes rotation induced by the axion field of the galactic halo. In our first observing run, the detector reached a peak sensitivity of 1.44*10^(-10) GeV^(-1) (at a 95 % confidence level) to the axion-photon coupling strength in the mass range of 1.97-2.01 neV, establishing it as one of the most sensitive axion detectors currently available. We provide the latest update on the sensitivity figures and discuss our pathway towards surpassing the current sensitivity limits in the mass range from 10^(-8) eV down to 10^(-16) eV. This involves implementing a squeezed light source and adjusting the measurement band via the resonance separation in our cavity.
Interferometric sensors provide an excellent opportunity for studying novel aspects of quantum mechanics. In this paper, we present the updated design for a suspended, cryogenically cooled table-top interferometer that can operate at the standard quantum limit of sensitivity. In this mode of operation, we will be able to probe aspects of macroscopic entanglement, quantum correlations, and semi-classical and quantum gravity models. We present the up-to-date experimental progress as well as the results of ongoing investigations.
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