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DTSTAMP:20260424T040549Z
UID:68da6ca7ef652686328879@ist.ac.at
DTSTART:20251002T150000
DTEND:20251002T160000
DESCRIPTION:Speaker: Andrea Morello\nhosted by Georgios Katsaros/Johannes F
 ink\nAbstract: I will present recent experiments\, and exciting new direct
 ions\, for the use of high-spin nuclei in silicon for quantum information\
 , quantum foundations\, and spin-mechanics entanglement. Nuclear spins in 
 silicon are among the most coherent quantum objects to be found in the sol
 id state. They have infinite relaxation time\, and second-scale coherence 
 time [1]. By using the I=7/2\, 8-dimensional nucleus of antimony [2]\, we 
 have prepared a nuclear Schroedinger cat within a functional nanoelectroni
 c device [3]. This can be used to encode a cat-qubit similar to the bosoni
 c encodings used in microwave cavities\, but with atomic size\, and even m
 ore extreme noise bias. Recent work on the simpler phosphorus atoms has sh
 own the ability to entangle nuclear spins that are not bound to the same e
 lectron [4]. As the next step for scaling up donor quantum processors\, we
  are working to integrate the donors with lithographic quantum dots\, and 
 I will present preliminary results in that direction.We then used the Schr
 oedinger cat and other nonclassical states to perform a curious experiment
 \, where the quantumness of the state is certified by monitoring its unifo
 rm precession\, in seeming contradiction with Ehrenfest's theorem [4]. Hig
 h-spin nuclei possess a quadrupole moment that couples them to lattice str
 ain [5]. I will discuss plans to entangle a single nuclear spin with a MHz
 -range mechanical oscillator\, and perspectives to scale up the mass of th
 e oscillator to test gravitational collapse models.[1] J. Muhonen et al.\,
  Nature Nanotechnology 9\, 986 (2014)[2] S. Asaad\, V. Mourik et al.\, Nat
 ure 579\, 205 (2020)[3] X. Yu et al.\, Nature Physics 21\, 362 (2025)[4] H
 . Stemp et al\, Science 389\, 1234 (2025)[5] A. Vaartjes et al.\, Newton 1
 \, 100017 (2025)[6] L. O'Neill et al.\, Applied Physics Letters 119\, 1740
 01 (2021)
LOCATION:Moonstone Bldg / Ground floor / Seminar Room G (I24.EG.030g)\, IST
 A
ORGANIZER:swiddman@ist.ac.at
SUMMARY:Andrea Morello: Schroedinger cat in a silicon box: quantum informat
 ion and quantum foundations
URL:https://talks-calendar.ista.ac.at/events/6052
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