Close

Filter courses

Show courses Show filters
Close

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 Readout

In this video, Menno presents the two qubit readout mechanisms.

Main takeaways

  • Two types of qubit readout: Energy selective readout (or Elzerman readout) and Pauli spin blockade readout
  • Elzerman readout requires one quantum dot coupled to a reservoir, the energy levels of the spin up and down are aligned with the reservoir such that only one state can tunnel out.
  • Pauli spin blockade readout requires two quantum dots based on the Pauli exclusion principle between two spins.

Further thinking

At low magnetic field, which readout mechanism is most relevant?

a. Energy selective readout
b. Pauli spin blockade readout

Solution

Further reading

Section VI: https://arxiv.org/pdf/cond-mat/0610433.pdf 

Latched Pauli spin blockade readout: https://arxiv.org/abs/1703.02651