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X-FROM-URL:https://eom.sdu.dk/events/ical/4dd5fb25-378c-40eb-9932-db17d528
 ecf9
X-WR-CALNAME:QM Research Seminar: Circumventing the no-go theorems: self-c
 orrecting qubits and protected non-Clifford gates with driven-dissipative
  superconducting resonators
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TZID:Europe/Copenhagen
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DTSTAMP:20260413T235209Z
DTSTART:20261028T030000
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DTSTART:20260325T020000
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DESCRIPTION:[b]Speaker: Frederik Nathan [/b](University of Copenhagen).\n\
 n[b]Abstract: [/b]\nThe current main paradigm for quantum computing — act
 ive quantum error correction (AEC) with overhead qubits — faces two chall
 enges: Realizing long-lived logical qubits at reasonable resource cost\, 
 and achieving universal fault-tolerant quantum gates. At the root of thes
 e challenges lie two no-go theorems: The Braviy-Terhal theorems\, which f
 orbids passively-stabilized\, or self-correcting\, qubits in <4 dimension
 s\, and the Eastin-Knill theorem which dictates that fault-tolerant non-C
 lifford gates must be generated with costly magic distillation or cultiva
 tion routines. Together\, these theorems imply that even simple quantum i
 nformation processing operations require continuous readout\, data proces
 sing\, and feedback control of very large numbers of overhead qubits. \n\
 nHere I illustrate how the no-go-theorems above are not as far-reaching a
 s one could fear\, but can be circumvented via an alternative paradigm fo
 r quantum computing currently gaining experimental maturity: bosonic code
 s (BC)\, which redundantly encodes a qubit in the infinite-dimensional Fo
 ck state of a single continuous variable. In particular\, I will demonstr
 ate how tuning the impedance of a simple driven-dissipative superconducti
 ng resonator to a “magic” value given by a constant of nature can lead to
  a self-correcting Gottesman-Kitaev-Preskill qubit that supports exponent
 ially-robust Clifford and non-Clifford gates [1\,2]. \n\n[1] [b]FN[/b]\, 
 L. O’Brien\, K. Noh\, M.H. Matheny\, A.L. Grimsmo\, L. Jiang\, G. RefaelP
 RX Quantum 6 (3)\, 030352 (2025)[2] L. O'Brien\, G. Refael\, [b]FN[/b] ar
 Xiv:2507.19713 (2025)
DTEND:20260316T150000Z
DTSTAMP:20260413T235209Z
DTSTART:20260316T140000Z
LOCATION:Syddansk Universitet\, Campusvej 55\, 5230\, Odense M
SEQUENCE:0
SUMMARY:QM Research Seminar: Circumventing the no-go theorems: self-correc
 ting qubits and protected non-Clifford gates with driven-dissipative supe
 rconducting resonators
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