Preserving entanglement during weak measurement demonstrated with a violation of the bell–leggett–garg inequality

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • T. C. White
  • J. Y. Mutus
  • J. Dressel
  • J. Kelly
  • R. Barends
  • E. Jeffrey
  • D. Sank
  • A. Megrant
  • B. Campbell
  • Yu Chen
  • Z. Chen
  • B. Chiaro
  • A. Dunsworth
  • C. Neill
  • P. J.J. O’malley
  • P. Roushan
  • A. Vainsencher
  • J. Wenner
  • A. N. Korotkov
  • John M. Martinis

Detail(s)

Original languageEnglish
Article number15022
Journal / Publicationnpj Quantum Information
Volume2
Issue number1
Publication statusPublished - 2016
Externally publishedYes

Link(s)

Abstract

Weak measurement has provided new insight into the nature of quantum measurement, by demonstrating the ability to extract average state information without fully projecting the system. For single-qubit measurements, this partial projection has been demonstrated with violations of the Leggett–Garg inequality. Here we investigate the effects of weak measurement on a maximally entangled Bell state through application of the Hybrid Bell–Leggett–Garg inequality (BLGI) on a linear chain of four transmon qubits. By correlating the results of weak ancilla measurements with subsequent projective readout, we achieve a violation of the BLGI with 27 s.d.s. of certainty.

Research Area(s)

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Preserving entanglement during weak measurement demonstrated with a violation of the bell–leggett–garg inequality. / White, T. C.; Mutus, J. Y.; Dressel, J.; Kelly, J.; Barends, R.; Jeffrey, E.; Sank, D.; Megrant, A.; Campbell, B.; Chen, Yu; Chen, Z.; Chiaro, B.; Dunsworth, A.; Hoi, I. C.; Neill, C.; O’malley, P. J.J.; Roushan, P.; Vainsencher, A.; Wenner, J.; Korotkov, A. N.; Martinis, John M.

In: npj Quantum Information, Vol. 2, No. 1, 15022, 2016.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review