29 citations · 114 across the 8 of their papers we have counts for
8 papers
Measurement of Gravitational Coupling between Millimeter-Sized Masses
Tobias Westphal, Hans Hepach, Jeremias Pfaff +1
We demonstrate gravitational coupling between two gold spheres of approximately 1mm radius and 90mg mass. By periodically modulating the source mass position at a frequency f=12.7m…
Passive-performance, analysis, and upgrades of a 1-ton seismic attenuation system
G Bergmann, C M Mow-Lowry, V B Adya +13
The 10m Prototype facility at the Albert-Einstein-Institute (AEI) in Hanover, Germany, employs three large seismic attenuation systems to reduce mechanical motion. The AEI Seismic-…
A graphical description of optical parametric generation of squeezed states of light
Joeran Bauchrowitz, Tobias Westphal, Roman Schnabel
The standard process for the production of strongly squeezed states of light is optical parametric amplification (OPA) below threshold in dielectric media such as LiNbO3 or periodi…
Tomographic readout of an opto-mechanical interferometer
Henning Kaufer, Andreas Sawadsky, Tobias Westphal +2
The quantum state of light changes its nature when being reflected off a mechanical oscillator due to the latter's susceptibility to radiation pressure. As a result, a coherent sta…
Interferometer readout-noise below the Standard Quantum Limit of a membrane
Tobias Westphal, Daniel Friedrich, Henning Kaufer +7
Here we report on the realization of a Michelson-Sagnac interferometer whose purpose is the precise characterization of the motion of membranes showing significant light transmissi…
Laser interferometry with translucent and absorbing mechanical oscillators
D. Friedrich, H. Kaufer, T. Westphal +7
The sensitivity of laser interferometers can be pushed into regimes that enable the direct observation of quantum behaviour of mechanical oscillators. In the past, membranes with s…