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Entanglement and Quantum Engineering with optical Microcavities

Periodic Reporting for period 3 - EQUEMI (Entanglement and Quantum Engineering with optical Microcavities)

Reporting period: 2018-10-01 to 2020-03-31

This project leverages the unique properties of optical fiber Fabry-Perot (FFP) microcavities pioneered by the PI's group to advance the field of quantum engineering. It will take quantum-enhanced measurement from its current proof-of-principle state to a true metrological level by applying cavity-based spin squeezing to a compact atomic clock, aiming to improve the clock stability beyond one part in 10^-13 in one second. In a new experiment, multiparticle entangled states with high metrological gain will be generated by applying cavity-based entanglement schemes to alkaline earth-like atoms, the atomic species used in today’s most precise atomic clocks. In a second phase, a miniature quantum gas microscope will be added to this experiment, creating a rich new situation at the interface of quantum information, metrology, and cutting-edge quantum gas research. Finally, the project will further improve FFP microcavity technology, which will open new horizons for light-matter interfaces in quantum technologies. The new microcavities developed here are also expected to generate spin-offs in fields such as fiber telecommunication and optical metrology.
The project is currently in its startup phase. Experiments are being built and novel technologies are being developed to reach the project goals. In particular, a hybrid microchip has been developed that contains the circuitry of a trapped-atom clock plus an optical microcavity with high finesse to reduce measurement noise below the classical limit. An experiment for laser cooling strontium is also being set up.
A novel CO2 laser dot machining technique has been developed which allows fabrication of a wide variety of user-defined shapes with ultralow roughness in fused silica. This method can be used to create spherical mirrors and lens arrays on the tip of an optical fiber. Applications are in optical fiber technology and in quantum engineering.
Optical fiber microcavities on an atom chip. Developed and built as part of the EQUEMI project.