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Highly-Integrated Circuits for Quantum Applications

Kolloquium der Abteilung 2

First, current state of the art electronic realization for quantum applications is shown using off-the-shelf equipment. Next, the potential of miniaturization and scalability of the trapped ion quantum computer by means of integration is visualized. The required system-on-chip is described in detail and specified to building blocks. The challenges related to achieving the electrical specifications (such as suppression of unwanted harmonics or port isolation) are discussed. Modelling results at cryogenic temperature of SiGe HBT and MOS transistors of 0.13 µm SiGe HBT BiCMOS technology are presented. The results of modelling are applied to design of the microwave sources for controlling the qubit states and the impact of modelling is shown. Finally, a system-on-chip for driving the trapped ions is discussed.
Another example of integrated circuit design for quantum application is shown for quantum metrology. A system-on-chip driving Josephson Arbitrary Waveform Synthesizer (JAWS) is presented. The highly integrated system transfers a 2^17 bit long sigma-delta-modulated sequence at a speed of 100 Gbps (with an on-chip generated clock of 100 GHz) onto a JAWS chip to create an extremely high purity flux quantized signal.
Finally, a vision on modelling and circuit design for circuits operating up to very high frequencies at cryogenic temperatures for quantum applications is given.