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Controlling the interaction of light and matter is the basis for diverse applications ranging from light technology to quantum information processing. Nowadays, many of these applications are based on nanophotonic structures. It turns out that the confinement of light in such nanostructures imposes an inherent link between its local polarization and its propagation direction, also referred to as spin-momentum...
Integrated optical circuits for information processing promise to outperform their electronic counterparts in terms of bandwidth and energy consumption. However, such circuits require components that control the flow of light. In our group we employ micro- and nanophotonic components such as optical nanofibers to confine light at the wavelength scale and to control its flow in integrated optical environments...
The development of atom interferometry in the last few decades has led to high precision measurements of inertial effects and tests of fundamental physics [1]. New methods for higher sensitivity atom interferometers (AIs) are being explored, in particular the interrogation of atoms with optical cavities. The benefits of optical cavities would be higher optical power allowing large momentum transfer...
Nowadays, cold atom-based quantum sensors such as atom interferometers are leaving the optical labs [1, 2], thus allowing fundamental physics to be tested in space. The use of different quantum objects such as Potassium (K) and Rubidium (Rb) ultra-cold quantum gases enables tests of the Universality of Free Fall (UFF) [1-4]. While narrow linewidth lasers emitting at 767 nm and 780 nm are used to build...
Many applications today require stable optical frequency references, such as fully-stabilized optical frequency combs (OFCs), continuous-wave (cw) lasers referenced to high-finesse optical resonators or to various types of atomic/molecular transitions. Feedback loops are used for this purpose, in particular phase-locked loops (PLL). For example, a cw laser diode can be phase-locked to an optical mode...
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