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SUMMARY:Quantum Computing with Silicon and Germanium Hole Spins - Professo
 r Dominik Zumbühl
DTSTART:20240820T130000Z
DTEND:20240820T140000Z
UID:TALK219190@talks.cam.ac.uk
CONTACT:111806
DESCRIPTION:Quantum computers hold the potential to solve key tasks expone
 ntially faster than classical computers\, giving rise to a new quantum era
 . Classical transistor scaling achieved the integration of billions of tra
 nsistors on-chip reaching sizes so small that a single electron or hole ca
 n be trapped and held in place. The spin of such a trapped charge is a pri
 me contender for building scalable quantum bits out of classical transisto
 rs\, thus making semiconductor spins a leading candidate for full-scale qu
 antum computing.\n\nThe spin-orbit interaction (SOI) is at the heart of ke
 y phenomena in condensed matter physics. It arises from the relativistic p
 hysics conveniently creating magnetic out of electric fields\, working ver
 y efficiently for holes in semiconductors. This makes possible all-electri
 cal coherent spin manipulation without requiring micromagnets\, thus reduc
 ing the qubit footprint and improving scaling. Yet the SOI\, similar to mi
 cromagnets\, also opens the door for charge noise to cause spin dephasing\
 , thus posing a fundamental challenge for spin qubits.\n\nIn this talk\, I
  will present recent progress on building spin-orbit qubits with holes in 
 Ge/Si core/shell nanowires and Si fin FETs. Highlights include ultrafast q
 ubits\, taking only 1 ns to coherently rotate a spin from pointing up to d
 own\; operation of spin qubits up to 5 K\, where vast cooling power become
 s available\, making possible integration of the classical control electro
 nics\; operation of a 2-qubit gate with highly anisotropic exchange\, allo
 wing for high fidelity gate operation while operating at high speeds\; and
  finally a sweet spot combining both maximal coherence and maximal speed\,
  thus opening new avenues for ultrafast and highly coherent spin-orbit qub
 its.\n\nThis work was supported by the NCCR SPIN\, the Swiss National quan
 tum computation program of the Swiss NSF\, the Swiss Nanoscience Institute
  (SNI)\, the Georg H. Endress Foundation\, and the EU H2020 European Micro
 kelvin Platform EMP\, TOPSQUAD\, QUSTEC and QLSI programs.\n\n     \n
LOCATION:Ryle Seminar Room (930) 
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