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UID:619b4516c1957429482416@ist.ac.at
DTSTART:20211206T143000
DTEND:20211206T153000
DESCRIPTION:Speaker: Monica Benito\nhosted by Georgios Katsaros\nAbstract: 
 The latest experimental progress in fabrication of one- and two-dimensiona
 l sizable arrays of QDs suggest that quantum information science applicati
 ons are feasible in these devices\, as originally envisioned by Loss and D
 iVincenzo. Spin qubits in Si and Ge are considered strong candidates for r
 ealizing a large-scale quantum processor due to the small qubit dimensions
 \, compatibility with CMOS technology\, long coherence times and possibili
 ty to operate beyond 1 Kelvin. Important challenges concerning scalability
  of spin qubits defined on QDs can be overcome by turning the qubits elect
 rically addressable. In the case of electrons one can take advantage of th
 e intrinsic spin-orbit (SO) coupling or gradients of magnetic field (for e
 xample created by external micromagnets). The physics of holes\, dictated 
 by the Luttinger-Kohn Hamiltonian\, has attracted much attention lately be
 cause it naturally brings the electrical handle thanks to a strong SO coup
 ling without analogous in electron systems. After summarizing the progress
  towards a scalable quantum computing architecture with Si QDs embedded in
  a micromagnet stray field [1\,2]\, I will present recent results on hole 
 spin qubits in Ge. By means of a novel analytical approach\, we obtain an 
 effective low-energy model for hole nanowires that accounts for orbital ef
 fects of the magnetic field exactly [3]. We show the relevance of orbital 
 effects on the SO interaction and\, by complementing with numerical calcul
 ations\, also on the g-factor. We predict optimal qubit operation at a cha
 rge noise sweetspot with Rabi frequencies in the GHz regime. Finally\, by 
 modeling planar QD hole spin qubits we find that they can present strong a
 nd tunable SO interaction if the confinement potential is properly squeeze
 d[4]. This confinement-induced SO interaction and therefore the qubit-reso
 nator coupling could be turned on and off on demand in state-of-the-art qu
 bits.[1] X. Mi\, M. Benito\, S. Putz\, D. M. Zajac\, J. M. Taylor\, G. Bur
 kard\, andJ. R. Petta\, Nature 555\, 599 (2018).[2] M. Benito\, J. R. Pett
 a\, and G. Burkard\, Phys. Rev. B 100\, 081412 (R)(2019).[3] C. Adelsberge
 r\, M. Benito\, S. Bosco\, J. Klinovaja\, and D. Loss\,arXiv:2110.15039.[4
 ] S. Bosco\, M. Benito\, C. Adelsberger\, and D. Loss\, Phys. Rev. B 104\,
 115425 (2021).
LOCATION:Heinzel Seminar Room / Office Bldg West (I21.EG.101)\, ISTA
ORGANIZER:swiddman@ist.ac.at
SUMMARY:Monica Benito: Hole spin qubits in elongated quantum dots
URL:https://talks-calendar.ista.ac.at/events/3427
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