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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

Multi-qubit control and quantum algorithms

In this video, Menno Veldhorst presents how ti implement multi-qubit operations with the ultimate goal of performing quantum simulations. 

Main takeaways

  • Two-qubit interactions rely on the exchange interaction between qubits.
  • In a multi-qubit system, the resonance frequency of each qubit depends on the interaction with the other qubit.
  • A universal gate set is the combination of single qubit control and CPHASE gate.
  • Algorithm can be implemented to correct qubit errors.

Further thinking

What is a CROT gate ?

a. A conditional rotation gate
b. A operation gate between two qubits that depends on the exchange interaction between the two qubits
c. A operation on the target qubit that depends on the state of the control qubit

Solution

Further reading

Semiconductor spin qubits review https://arxiv.org/pdf/2112.08863.pdf
4 qubit processor in Germanium https://arxiv.org/pdf/2009.04268.pdf 
Phase flip error correction https://arxiv.org/abs/2202.11530 
Probing resonating valence bonds on a programmable germanium quantum simulator https://arxiv.org/abs/2208.11505