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Repeated quantum error correction on a continuously encoded qubit by real-time feedback

Journal Article (2016)
Author(s)

J. Cramer (Kavli institute of nanoscience Delft, TU Delft - QID/Hanson Lab, TU Delft - QuTech Advanced Research Centre)

N. Kalb (TU Delft - QID/Hanson Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)

M. A. Rol (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/DiCarlo Lab)

B. Hensen (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Hanson Lab)

M. S. Blok (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Quantum Transport)

M. Markham (Element Six Innovation)

D. J. Twitchen (Element Six Innovation)

R. Hanson (TU Delft - QID/Hanson Lab, TU Delft - Applied Sciences, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)

T. H. Taminiau (Kavli institute of nanoscience Delft, TU Delft - QID/Taminiau Lab, TU Delft - QuTech Advanced Research Centre)

Research Group
QID/Hanson Lab
DOI related publication
https://doi.org/10.1038/ncomms11526 Final published version
More Info
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Publication Year
2016
Language
English
Research Group
QID/Hanson Lab
Volume number
7
Article number
11526
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469
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Institutional Repository
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Abstract

Reliable quantum information processing in the face of errors is a major fundamental and technological challenge. Quantum error correction protects quantum states by encoding a logical quantum bit (qubit) in multiple physical qubits. To be compatible with universal fault-tolerant computations, it is essential that states remain encoded at all times and that errors are actively corrected. Here we demonstrate such active error correction on a continuously protected logical qubit using a diamond quantum processor. We encode the logical qubit in three long-lived nuclear spins, repeatedly detect phase errors by non-destructive measurements, and apply corrections by real-time feedback. The actively error-corrected qubit is robust against errors and encoded quantum superposition states are preserved beyond the natural dephasing time of the best physical qubit in the encoding. These results establish a powerful platform to investigate error correction under different types of noise and mark an important step towards fault-tolerant quantum information processing.