A5062582167- Mechanical and Optical Resonators
- Photonic and Optical Devices
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Advanced Fiber Laser Technologies
- Magneto-Optical Properties and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Electron Microscopy Techniques and Applications
- Gyrotron and Vacuum Electronics Research
- Quantum Mechanics and Applications
- Atomic and Subatomic Physics Research
- Terahertz technology and applications
- Advanced Fiber Optic Sensors
- Advanced Photonic Communication Systems
Vienna Center for Quantum Science and Technology
2014-2022
TU Wien
2014-2022
Institute for Quantum Optics and Quantum Information Innsbruck
2022
Austrian Academy of Sciences
2022
University of Vienna
2016
Imperial College London
2016
We demonstrate a fiber-integrated quantum optical circulator that is operated by single atom and relies on the chiral interaction between emitters transversally confined light. Like its counterparts in classical optics, our exhibits an inherent asymmetry light propagation forward backward direction. However, rather than magnetic field or temporal modulation, it internal state of controls operation direction circulator. This working principle compatible with preparing coherent superposition...
We demonstrate trapping of a single $^{85}\mathrm{Rb}$ atom at distance about 200 nm from the surface whispering-gallery-mode bottle microresonator. The is trapped in an optical potential, which created by retroreflecting red-detuned focused laser beam resonator surface. counteract trap-induced light shift atomic transition frequency superposing second beam. This allows us to observe vacuum Rabi splitting excitation spectrum coupled atom-resonator system. first demonstration stable and...
Abstract It is usually considered that the spectrum of an optical cavity coupled to atomic medium does not exhibit a normal-mode splitting unless system satisfies strong coupling condition, meaning Rabi frequency coherent exceeds decay rates atom and excitations. Here we show this need be case, but depends on way in which probed. Measurements reflection probe laser from input mirror overdamped reveal avoided crossing observed when driving atoms directly measuring Purcell-enhanced emission....
Here we demonstrate the experimental realization of a fiber-integrated optical circulator whose operation direction is controlled by quantum state single atom. The device based on bottle whispering-gallery-mode microresonator interfaced two nanofibers. Depending its internal state, atom couples differently to chiral resonator fields. This results in dependent transmission through and thus realizes an circulator. demonstrated opens new ways for routing processing information circuits.
Optical fibers play a key role in many different fields of science and technology. In particular, with diameter several micrometers are intensively used photonics. For these applications, it is often important to precisely know control the fiber radius. Here, we demonstrate novel technique determine local radius variation 30-micrometer silica sub-\AA ngstr\"om precision axial resolution tens over length more than half millimeter. Our method relies on taking an image fiber's...
We present a method to separate coherent and incoherent contributions of cathodoluminescence (CL) by using time-resolved coincidence detection scheme. For proof-of-concept experiment, we generate CL irradiating an optical multimode fiber with relativistic electrons in transmission electron microscope. A temporal analysis the reveals large peak counts for small time delays, also known as photon bunching. Additional measurements allow us attribute bunching correlations (Cherenkov radiation)...
Integrated optical circuits for information processing promise to outperform their electronic counterparts in terms of bandwidth and energy consumption. However, such require components that control the flow light. In our group we employ micro- nanophotonic as nanofibers confine light at wavelength scale its integrated environments. The strong confinement leads an inherent link between local polarization propagation direction, i.e., obtains a chiral character. This fundamentally alters...
We demonstrate the trapping of single atoms in evanescent field a whispering-gallery-mode (WGM) resonator with standing wave optical dipole trap. present our progress towards an improved trap loading scheme.