BEGIN:VCALENDAR
VERSION:2.0
PRODID:Icfo
X-PUBLISHED-TTL:P1W
BEGIN:VEVENT
UID:69dbd4b531ac3
DTSTART:20260424T100000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20260424T110000Z
LOCATION:Seminar Room
SUMMARY:ICFO | SIMON ZIHLMANN
CLASS:PUBLIC
DESCRIPTION:Coherent spin-photon interfaces between microwave photons and s
 pins in silicon quantum dots are now routinely achieved [1-3]. The key ing
 redient in resolving this outstanding challenge was the engineering of a l
 arge electric-dipole moment linked to the spin\, achieve by delocalizing a
  spin within a double-quantum dot under the influence of spin-orbit intera
 ction. These spin qubits\, also known as flopping-mode spin qubits\, have 
 enabled the first SWAP operations between spin qubits separated by over 25
 0 micrometers [4]\, paving the way to address the wiring challenges in den
 se spin qubit processors.\nHowever\, the coherence properties of flopping 
 mode spin qubits reported to date remain limited\, hindering their use in 
 practical applications. Here\, we report on a hole spin delocalized in a d
 ouble quantum dot formed in a silicon nanowire MOS device coupled to a hig
 h impedance superconducting microwave resonator [3]. With Rabi frequencies
  exceeding 100 MHz and coherence times in the microsecond range\, we show 
 that delocalized spins can achieve high qubit quality factors\, enabling h
 igh-fidelity gate operations.\nFurthermore\, we present a comprehensive an
 alysis of the mechanisms limiting spin relaxation and dephasing in a hybri
 d spin cQED architecture. Our findings reveal that spin relaxation is domi
 nated by radiative decay due to a structured electromagnetic environment (
 Purcell effect)\; while dephasing is limited by photon shot noise at opera
 tional points where the spin is first-order insensitive to charge noise. T
 his suggests that with an optimized cQED architecture considerably longer 
 coherence times can still be achieved. Our first approach in creating high
 -quality spin-cQED environments using semi-industrial flip-chip technology
  for 3D integration will be discussed.\nWith strong spin-photon coupling a
 nd promising single-qubit properties demonstrated here\, hole spin floppin
 g-mode qubits emerge as a promising platform for scalable quantum architec
 tures.\nReferences:\n\nSamkharadze et al. Science\, 359 (2018)\nMi et al. 
 Nature\, 555 (2018)\nYu et al. Nat. Nanotechnol. 18 (2023)\nDijkema et al.
  Nat. Phys. 21 (2025)\n
DTSTAMP:20260412T172157Z
END:VEVENT
END:VCALENDAR