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SUMMARY:A novel solid-state qubit platform with electron spins on a surfac
 e
DTSTART:20231027T141500
DTSTAMP:20260407T195104Z
UID:4468df4941b2c7e73fd3d3ee643ebd5d6e357a60ab99b9aa228164c9
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof.  Soo-hyon Phark Center for Quantum Nanoscience\, Insti
 tute for Basic Science\, Korea Ewha Womans University\, Korea\nAbstract: 
  \n\n \n\nAddressability to individual atoms and atom-by-atom position c
 ontrol [1] using a scanning tunneling microscope (STM) opens the bottom-up
  design of functional quantum devices. As an extension of such potential t
 o atomic/molecular spins\, STM can provide a platform of solid-state qubit
 s [2]\, which is unique in the sense of qubit platform design at a scale o
 f ~1 nm\, with an advantage of atom precision control of its structure and
  inter-qubit couplings. Here we demonstrate atom-by-atom construction\, co
 herent operations\, and readout of coupled electron-spin qubits using an S
 TM combined with pulsed electron spin resonance (ESR) [3]. To enable the c
 oherent control of "remote" qubits that are outside the tunnel junction\, 
 we complement each electron spin with a local magnetic field gradient from
  a nearby single-atom magnet [4]. Readout is achieved by employing a senso
 r qubit in the tunnel junction and implementing double electron-electron s
 pin resonance [5]. Single-\, two-\, and three-qubit operations are thereby
  demonstrated in an all-electrical fashion [6\,7]. Our work marks the crea
 tion of an angstrom-scale qubit platform\, where quantum functionalities u
 sing electron spin arrays\, built atom-by-atom on a surface\, are now with
 in reach.\n\n \n\nRefs:\n1.     D. M. Eigler\, E. K. Schweizer\, Na
 ture 344\, 524–526 (1990).\n2.     A. J. Heinrich et al. Nat. Na
 notechnol. 16\, 1318–1329 (2021).\n3.     K. Yang et al. Science
  366\, 509-512 (2019).\n4.     S. Phark et al. Adv. Sci. 2302033 (2
 023).\n5.     S. Phark et al. ACS Nano 17\, 14144 (2023).\n6.  
    Y. Wang et al. npj Quantum Info. 9\, 48 (2023).\n\n7.     Y. 
 Wang et al. Science (accepted). \n\n
LOCATION:PH L1 503 https://plan.epfl.ch/?room==PH%20L1%20503 https://epfl.
 zoom.us/j/89778378177?pwd=VXNRZ3hJVnozMDNoR3lvZ2IwZzhXUT09
STATUS:CONFIRMED
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