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Optical Quantum Technologies
(2024)
Standard optical fibers guide light through total internal reflection in high refractive index material such as glass or polymers surrounded by low index material. Guiding light in optically dense matter however has some major disadvantages: Absorption, dispersion and Rayleigh-scattering place a lower bound to attenuation. In this work, a photonic crystal structure based on interference was studied, where light is guided in air surrounded by optical dense media. An attenuation of sub 0.1 db/km has been simulated numerically by optimizing the geometry of the fiber cross section. Ultra low-loss optical waveguides open up many possibilities for the design of laser resonators on the one hand and optical interfaces between atoms, quantum dots, NV-centers and light sources and detectors on the other hand. Those technologies require highly efficient light-coupling that can be directed at will.
Optical design and tolerance analysis of additively manufactured optical interfaces for spin qubits
(2025)
Readout efficiency is crucial in all optical quantum technologies that employ single qubits or single quantum emitters. One of those systems is the nitrogen vacancy (NV-Center) in diamond, where total internal reflection at the diamond surface severely limits the photon yield. Recent efforts for enhancing the collection efficiency of single NV-Centers include shaping the diamond surface to a hemisphere or printing solidimmersion lenses (SIL) on top of it. In order to further improve the photon collection efficiency, we intend to additively manufacture polymer lenses on top of the crystal via multi-photon lithography. This works presents multiple optical designs based on 3D-printed polymer lenses and discusses their performance, robustness and scalability via simulation of their optical, thermal and mechanical properties. We also
present a method to determe lens geometries based on a differential
equation approach.
At TH Nürnberg, we are in the process of procuring large-scale research equipment for additive manufacturing of microlenses and deterministic generation of color centers. We present how this equipment shall be used for the manufacturing of optical and photonic interfaces for the miniaturization and integration of quantum systems. Both equipment and cleanroom of TH Nürnberg could be used by MQV and its partners.