Calendar of Physics Talks Vienna

Low-loss fluorescence detection of ytterbium atom arrays at the microsecond scale

Speaker:	Matteo Marinelli (University Trieste)
Abstract:	Scalable quantum technologies based on neutral atoms require fast, high-fidelity, and low-loss imaging of individual atoms. In this talk, I will present our recent results on achieving such imaging in optical tweezers without active cooling, enabled by the favorable atomic properties of ytterbium. Using a pulsed excitation scheme, we collect fluorescence on microsecond timescales, reaching single-atom discrimination fidelities above 99.9% and survival probabilities above 99.5% in a single shot. By interleaving short recooling pulsesâjust a few hundred microseconds for atoms in magic trapsâwe perform tens of consecutive detections with constant per-image loss. This capability is key for mid-circuit feedback in tweezer-based quantum processors and optical clocks. Unlike conventional protocols, our imaging does not induce parity projection in multiply-occupied traps. This allows number-reso
Date:	Mon, 07.07.2025
Time:	11:00
Duration:	45 min
Location:	Helmut Rauch HÃ¶rsaal ATI
Contact:	Julian LÃ©onard

Enhancing Quantum Sensors for Space Applications using Entanglement

Speaker:	Simon Haase (UniversitÃ¤t Hamburg)
Abstract:	Atom interferometers are high-precision sensors for acceleration, rotation and magnetic fields. Space-borne atom interferometers promise a wide range of applications from geodesy to fundamental tests of physics. Their improved sensitivity due to prolonged interrogation times benefits from the macroscopic coherence length and slow expansion rates of Bose-Einstein condensates (BECs). A limit for the precision is the Standard Quantum Limit. By using entangled ensembles of atoms, the limit can be surpassed, improving the sensitivity of interferometric measurements. The INTENTAS project is designed as a source of entangled atoms that can be operated on a microgravity platform. To demonstrate sensitivity beyond the Standard Quantum Limit, a rubidium BEC is generated, entangled via spin-changing collisions and detected with high resolution. In this talk I will present an overview of the experi
Date:	Thu, 10.07.2025
Time:	15:30
Duration:	45 min
Location:	Helmut Rauch HÃ¶rsaal ATI
Contact:	Julian LÃ©onard