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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
(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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