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Germanium Quantum Technology

01 /What can CMOS technology do for quantum computing? 02 /Semiconductor devices and scaling with industrial approach 03 /Semiconductor foundry facilities: the good and the bad for qubits 04 /IMEC's latest qubit developments 05 /Summary and outlook 06 /Semiconductors for spin qubits 07 /Germanium quantum wells on silicon 08 /Germanium quantum wells on silicon-germanium 09 /Growth methods 10 /Characterization techniques 11 /Electrical characterization of germanium quantum wells 12 /Fabrication of H-FET 13 /Semiconductor qubits: vision and challenges 14 /Quantum materials 15 /Quantum dot qubits and their operation 16 /Types of quantum dot qubits 17 /Qubit Readout 18 /Qubit Control 19 /Qubit Coherence and Fidelity 20 /Multi-qubit control and quantum algorithms 21 /Quantum links and scaling 22 /Physics of holes 23 /Hole spin qubits 24 /Introduction to electronics for quantum computing 25 /Room temperature electronics 26 /Cryogenic qubit chip carriers 27 /Contribution to IGNITE 28 /Quantum Control Stack for Spin Qubits 29 /Auto-tuning a quantum computer 30 /Tuning and operation of arrays 31 /Finding operation points example 32 /What is auto-tuning? 33 /Neural network tuning 34 /Navigating charge stability diagrams 35 /Experimental implementation 36 /Towards universal quantum algorithms 37 /Classical error correction 38 /Quantum error correction 39 /Progress and challenges 40 /Introduction to quantum algorithms 41 /The first algorithms 42 /Quantum annealing 43 /Quantum Machine Learning

Qubit Control

In this video, Menno presents how to control the spin states of a single electron or hole.

Main takeaways

  • Qubit control is possible with a stripline near by the spin. With an ac current, we can generate an ac magnetic field which can drive qubit rotations. This technique needs a high current flow and is not very local driving.
  • Nanomagnet generates a magnetic field gradient and by displacing the spins in this gradient it is equivalent to an ac magnetic field. Faster qubit operations are possible due to the electrical control.
  • Spin-orbit interactions can degenerate fast qubit rotations, and it is intrinsic to different material.
  • Hole qubits in Germanium can be electrically controlled with the intrinsic spin-orbit interaction.
  • The spin-orbit interaction induces different quantization axis in every quantum dot in Ge. Implementation of qubit rotations can be done by shuttling between two quantum dots.

Further thinking

True or False: Spin rotation can be induced by coherent shuttling between two quantum dots with different quantization axes.

Solution

Further reading

Semiconductor spin qubits review https://arxiv.org/pdf/2112.08863.pdf