Atomic Physics Seminars |
Events During the Week of February 11th through February 18th, 2024
Monday, February 12th, 2024
- Quantum metrology with an optical lattice atom interferometer interrogated for one minute
- Time: 12:00 pm - 1:00 pm
- Place: 5310 Chamberlin Hall
- Speaker: Cristian Panda, UC Berkeley
- Abstract: Exceptional levels of quantum control and coherence are instrumental in quantum metrology and sensing. Atom interferometers are powerful in both probing fundamental physics and everyday sensing but have been limited to measurement times of a few seconds by using atoms in free fall. I will describe how we realize interferometers with atoms suspended for an unprecedented 70 seconds in an optical lattice. This method is particularly well suited for probing localized potentials. I will show how, for the first time, we (1) optimize the gravitational sensitivity of the lattice interferometer and (2) use a system of signal inversions and switches to suppress and quantify systematic effects. This enables us to measure the attraction of a miniature source mass with record accuracy of 6.2 nm/s2, less than a billionth of Earth’s gravity and four times as good as the best similar measurements with freely falling atoms. This performance demonstrates the advantages of lattice interferometry in fundamental physics measurements. I will then show how the lattice atom interferometer can overcome the limits of current atomic gravimeters for applications in the field. Finally, I will discuss prospects for next-generation lattice atom interferometers and applications in precision measurement and quantum inertial sensing.
- Host: Thad Walker
Tuesday, February 13th, 2024
- No events scheduled
Wednesday, February 14th, 2024
- Photonic Links for Rydberg Atom Arrays
- Time: 12:00 pm - 1:00 pm
- Place: 5310 Chamberlin Hall
- Speaker: Ivana Dimitrova, Harvard University
- Abstract: Scaling up the number of qubits available in experimental systems is one of the most significant challenges in quantum computation. A promising path forward is to modularize the quantum processors and then connect many processors using quantum channels, realized using photons and optical fibers. For Rydberg atom arrays, one of the leading platforms for quantum information processing, this could be done by developing an interface for photons, such as an optical cavity. In addition, an optical cavity can be used for fast mid-circuit readout for error detection. In this talk, I will discuss recent progress with two types of cavities and their feasibility as a photonic link. First, we show coherent control of Rydberg qubits and two-atom entanglement as close as 130um away from a nanophotonic cavity. Second, we show fast high-fidelity qubit state readout at a fiber Fabry Perot cavity. In addition, a fiber cavity also allows for cavity-mediated atom-atom gates, which could enable novel quantum networking capabilities.
- Host: Thad Walker
Thursday, February 15th, 2024
- No events scheduled
Friday, February 16th, 2024
- No events scheduled