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                              “Current Challenges for Quantum Computing"





  Tuesday 18 June 2020

    Video-Recording for any system with MP4-support

   - Video.mp4  (ca.428 Mb)


 15:15 – 16:30



    David DiVincenzo

              (Forschungszentrum Jülich, Germany)



We have known for over twenty years that quantum computers would have unique

powers for solving certain classes of computational problems.  Throughout these

twenty years, workers have striven to identify a physical setting in which high-quality

qubits can be created and employed in a quantum computing system.

Very promising devices have been identified in several different areas of

low-temperature electronics, namely in superconductor and in single-electron

semiconductor structures (e.g., quantum dots).  Rudimentary efforts at scale-up are

presently underway; even for modules of 10 qubits, the complexity of the classical

electronic control system becomes one of the main barriers to further progress.

The specifications of this control system are now well defined, and are daunting.

In this talk I will touch on two aspects of this control problem.  First, I indicate the

problems with unintended couplings between qubits in multi-qubit structures.

For superconducting qubit systems, I show our current methodology for accurately

characterizing these couplings.  Second, I suggest solutions to the problem of

miniaturizing the microwave circulator, using the quantum Hall effect; current

circulators take up so much space in existing experiments that they limit the physical

scale-up of the systems.


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