Conveners
Quantum Sensors II
- Michael Doser (CERN)
Description
Quantum-limited devices allow to overcome classical physics limits on measurement precision. Such quantum sensors are maturing from being proof-of-principle experiments to measurement real-world measurement devices. Their use allows to improve probes of BSM physics beyond the capabilities of classical sensors. Atomic systems and NV-centers allow to probe electric and mag-netic fields, enhancing the measurement sensitivities through record-long coherence times of the individual sensors and entanglement among sensor ensembles. These systems can for instance be used to probe the very weak coupling of dark matter candidates like axions or milli-charged dark matter.
Quantum gases coupled to high-finesse optical resonators are a versatile platform to simulate many-body quantum systems, offering a high degree of experimental control. All-to-all interactions between the atoms naturally arise in such systems from the coupling of the atoms to a cavity mode, while cavity leakage facilitates real-time access to the dynamics of this open quantum system.
Here, we...
The time evolution of an quantum system can be strongly affected by dissipation. Although this mainly implies that the system relaxes to a steady state, in some cases it can bring to the appearance of new phases and trigger emergent dynamics. In our experiment, we study a Bose- Einstein Condensate dispersively coupled to a high finesse resonator. The cavity is pumped via the atoms, such that...
A nanosphere levitated in electromagnetic fields is a promising testbed for physics at the interface between the classical and the quantum realm. Recently, levitated particles have attracted attention as potential gravity quantum sources due to their large mass, ranging from $10^9$ to $10^{12}$ amu. A prerequisite to test the quantization of the gravitation field is, however, to prepare the...
The neutron represents a versatile tool in the realm of fundamental particle physics. It is used to perform precision physics measurements at low energies with the goal to search for beyond Standard Model signals. In this presentation, we will introduce activities currently pursued at the University of Bern. The projects encompass the hunt for a CP-violating neutron electric dipole moment...
Precision measurements of $\beta-$decay spectra can provide exquisitely sensitive tests of various predictions and underlying symmetry assumptions of the Standard Model (SM) of Particle Physics. Hypothetical scalar- and tensor-type interactions can alter the shape of the $\beta-$decay spectrum across the full energy range, while the finite masses of neutrinos mostly alter its shape around the...
