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DTSTART:19810329T030000
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UID:DSC-19898
DTSTART;TZID=Europe/Berlin:20230523T110000
SEQUENCE:1684820273
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20230523T120000
URL:https://www.dresden-science-calendar.de/calendar/de/detail/19898
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Asbóth: Coherent errors and readout errors in surface code
CLASS:PUBLIC
DESCRIPTION:Speaker: Prof. Dr. János Asbóth\nInstitute of Speaker: Budape
 st Univ. of Technology and Economics\nTopics:\n\n Location:\n  Name: IFW (
 D2E.27\, IFW Dresden)\n  Street: Helmholtzstraße 20\n  City: 01069 Dresde
 n\n  Phone: \n  Fax: \nDescription: The surface code is the leading candid
 ate for quantum error correction. However\, the level of protection it off
 ers against coherent errors\, i.e.\, nonfluctuating phase rotations on the
  physical qubits\, is not well known. We consider[1] the combined effect o
 f readout errors and coherent errors on the surface code. We use a recentl
 y developed numerical approach\, via a mapping of the physical qubits to M
 ajorana fermions[2]. We find a threshold for this combination of errors\, 
 with an error rate close to the threshold of the corresponding incoherent 
 error channel (random Pauli-Z and readout errors). Below the threshold\, s
 caling up the code leads to the rapid loss of coherence of errors on the l
 ogical level\, but error rates that are greater than those of the correspo
 nding incoherent error channel. We also vary the coherent and readout erro
 r rates independently\, and find that the surface code is more sensitive t
 o coherent errors than to readout errors. Our work extends the recent resu
 lts on coherent errors with perfect readout [2] to the experimentally more
  realistic situation where readout errors also occur.  [1]: M Aron and JK 
 Asboth: Coherent errors and readout errors in surface code\,  arXiv:2303.0
 4672 [2]: S Bravyi et al: Correcting coherent errors with surface codes\, 
 npj Quantum Information\, vol. 4\, no. 55 (2018) .
DTSTAMP:20260420T194123Z
CREATED:20230516T053751Z
LAST-MODIFIED:20230523T053753Z
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