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

J. Cramer, N. Kalb, M. A. Rol, B. Hensen, M. S. Blok, M. Markham, D. J. Twitchen, R. Hanson, T. H. Taminiau

Research output: Contribution to journalArticleScientificpeer-review

94 Citations (Scopus)
32 Downloads (Pure)

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.

Original languageEnglish
Article number11526
JournalNature Communications
Volume7
DOIs
Publication statusPublished - 5 May 2016

Keywords

  • applied physics
  • quantum information
  • qubits

Fingerprint Dive into the research topics of 'Repeated quantum error correction on a continuously encoded qubit by real-time feedback'. Together they form a unique fingerprint.

Cite this