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    Design of a microwave frontend for a trapped ion quantum computer
    (IEEE, 2025-03)
    Jaeger, Marvin
    ;
    Riemschneider, Georg Frederik
    ;
    Weiß, Nico
    ;
    Tegowski, Bartosz
    ;
    Kölpin, Alexander
    Unlike classical computers, which represent information as binary '1' and '0', quantum computers use qubits that exist in a superposition of both, enabling parallel computation. This capability allows them to solve special kinds of problems faster than classical computers. To process information, qubits are manipulated by applying energy, such as via a microwave signal, which is provided by a microwave frontend that ensures an appropriate frequency spectrum and power level. This paper defines the key parameters and implements such a frontend for trapped ion quantum computers which follow the magnetic gradient induced coupling (MAGIC) principle. The frontend is manufactured on a printed circuit board and measurements prove its functionality. It achieves an idle gate fidelity of 99.9% (99.99%) at an output power of 6.32 dBm (2.4 dBm).
    Publicationtype: Conference Paper
      84
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    Contactless transition for wideband double-ridge waveguides
    (IEEE, 2024)
    Jabi, Omar
    ;
    Weiß, Nico
    ;
    Riemschneider, Georg Frederik
    ;
    Riedinger, Ralf
    ;
    Kölpin, Alexander
    As quantum computers require temperatures near absolute zero, cryostats are utilized to deliver such conditions. This necessitates thermal decoupling in the signal feedlines. This paper introduces contactless waveguide transitions as an alternative to the currently used coaxial cables. Specifically, we present a contactless transition for WRD650 waveguides. The structure was optimised for transmission within the frequency range of 10 GHz to 18 GHz and validated by measurement. Additionally, the transition exhibits a relatively low susceptibility to misalignments and a decreased dispersion in contrast to rectangular waveguides.
    Publicationtype: Conference Paper
      82