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DTSTAMP:20260424T040601Z
UID:65b1088889619962844565@ist.ac.at
DTSTART:20250603T110000
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DESCRIPTION:Speaker: Dominik Zumbuhl\nhosted by Georgios Katsaros\nAbstract
 : Quantum computers promise to solve key tasks exponentially faster than c
 lassical computers\, holding great potential for society. Classical transi
 stor scaling integrated billions of transistors on-chip\, reaching transis
 tor sizes so small that a single electron can be trapped and held in place
 . The spin of such a trapped charge is a prime contender for building scal
 able qubits out of classical transistors. Spin Qubits are small\, fast and
  scalable\, and operate even at temperatures above 1 K\, thus allowing the
  integration of cryoCMOS control electronics. These advantageous propertie
 s make silicon spins a leading candidate for full-scale quantum computing.
  Hole spins can be coherently manipulated with all-electrical control due 
 to the spin-orbit interaction (SOI) without requiring micromagnets\, but t
 his also opens the door for decoherence by charge noise. Across a broad ra
 nge of qubits\, a pervasive trade-off becomes obvious: increased speed see
 ms only possible at the cost of qubit coherence. This qubit speed-coherenc
 e dilemma is posing a fundamental challenge for quantum computation. In th
 is talk\, I will present how the qubit speed can be increased without comp
 romising coherence\, thus boosting the qubit Q-factor by over an order of 
 magnitude [1]. This is made possible by heavy-hole light-hole mixing provi
 ding a maximum of spin-orbit strength at finite electrical field. Further\
 , we employed machine learning for fully autonomous tuning of a qubit from
  grounded gates to operational qubit [2]. Finally\, the two-hole exchange 
 is also highly anisotropic [3]\, opening the door for fast high fidelity g
 ate operation. These experiments provide a new way forward for quantum com
 puting with fast and coherent spins in Si and Ge.This work was supported b
 y the NCCR SPIN\, the Swiss National quantum computation program of the Sw
 iss NSF\, the Swiss Nanoscience Institute (SNI)\, and the EU H2020 Europea
 n Microkelvin Platform EMP\, TOPSQUAD\, QUSTEC and QLSI programs.[1] Compr
 omise-free scaling of qubit speed and coherence\, M. J. Carballido et al.\
 , arXiv:2402.07313.[2] Fully autonomous tuning of a spin qubit\, J. Schuff
 \, M. J. Carballido\, et al.\, arXiv:2402.03931.[3] Anisotropic exchange i
 nteraction in a fin field-effect transistor\, S. Geyer\, B. Hetnyi\, et al
 .\, Nature Physics 20\, 1152 (2024).
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:swiddman@ist.ac.at
SUMMARY:Dominik Zumbuhl: Spin-Orbit Qubits with Holes in Silicon and German
 ium
URL:https://talks-calendar.ista.ac.at/events/5604
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