ELFT HÍRADÓ

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SZFI SeminarAsbóth JánosBME Elm. Fiz. tanszék és Wigner FK Kvantumoptika és 
Kvantuminformatika OsztályCoherent errors and readout errors in surface 
codeTuesday, 28 March 2023, 10:00, KFKI Campus, Bldg. 1, 2nd floor, 
Conference RoomThe surface code is the leading candidate for quantum error 
correction. However, the level of protection it offers against coherent 
errors, i.e., nonfluctuating phase rotations on the physical qubits, is not 
well known. We consider[1] the combined effect of readout errors and coherent 
errors on the surface code. We use a recently developed numerical approach, 
via a mapping of the physical qubits to Majorana 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, scaling up the code leads to the rapid 
loss of coherence of errors on the logical level, but error rates that are 
greater than those of the corresponding incoherent error channel. We also 
vary the coherent and readout error rates independently, and find that the 
surface code is more sensitive to coherent errors than to readout errors. Our 
work extends the recent results on coherent errors with perfect readout [2] 
to the experimentally more realistic situation where readout errors also 
occur.[1]: A Marton and JK Asboth: Coherent errors and readout errors in 
surface code, arXiv:2303.04672[2]: S Bravyi et al: Correcting coherent errors 
with surface codes, npj Quantum Information, vol. 4, no. 55 (2018)Join Zoom 
Meetinghttps://wigner-hu.zoom.us/j/82652558110?pwd=b2FYYzdmYWJEcXFwbUhDRVR1YXN0Zz09Meeting
 ID: 826 5255 8110Passcode: 181581  Minden érdeklődőt szívesen látunk! - 
Everyone is welcome to attend.Attila Nagysem-admin AT szfki.hu