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DTSTAMP:20260424T040556Z
UID:65b10888895c3227279117@ist.ac.at
DTSTART:20250408T110000
DTEND:20250408T120000
DESCRIPTION:Speaker: Simon Zihlmann\nhosted by Georgios Katsaros\nAbstract:
  The entanglement of microwave photons and spin qubits in silicon represen
 ts a pivotal step forward for quantum information processing utilizing sem
 iconductor quantum dots. Such a hybrid spin circuit quantum electrodynamic
 s (spin cQED) architecture has become possible by imparting a substantial 
 electric dipole moment to a spin qubit by de-localizing it in a double qua
 ntum dot under spin-orbit interaction\, thereby forming a flopping-mode (F
 M) spin qubit. By leveraging the strong spinorbit interaction intrinsicall
 y present in the valence band of silicon\, we achieve a hole spinphoton co
 upling rate as high as 330MHz. We\, furthermore\, conduct a comprehensive 
 study of such a hole spin FM qubit embedded into a cQED architecture to sh
 ed light onto its intrinsic properties. Contrary to previous expectations\
 , we reveal that the decoherence is dominated by photonic effects in the f
 orm of photon emission for the relaxation and photon-shot noise for the de
 phasing\, rather than by mechanisms commonly limiting spin qubits. By miti
 gating these effects\, we demonstrate echo dephasing times up to 5 us and 
 Rabi frequencies as high as 120 MHz\, allowing for single qubit fidelities
  of 99.9%. With strong spin-photon coupling and the promising single-qubit
  properties\, hole spin flopping-mode qubits emerge as a promising platfor
 m for large scale quantum architectures.
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:swiddman@ist.ac.at
SUMMARY:Simon Zihlmann: Circuit QED with hole spins
URL:https://talks-calendar.ista.ac.at/events/5449
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