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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Cramer J,Kalb N,Rol MA,Hensen B,Blok MS,Markham M,Twitchen DJ,Hanson R,Taminiau THdoi
10.1038/ncomms11526subject
Has Abstractpub_date
2016-05-05 00:00:00pages
11526issn
2041-1723pii
ncomms11526journal_volume
7pub_type
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