4.8 Article

Violating Bell's inequality with remotely connected superconducting qubits

Journal

NATURE PHYSICS
Volume 15, Issue 8, Pages 741-+

Publisher

NATURE PUBLISHING GROUP
DOI: 10.1038/s41567-019-0507-7

Keywords

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Funding

  1. Army Research Office [W911NF-15-2-0058]
  2. Air Force Office of Scientific Research
  3. Department of Energy (DOE)
  4. NSF GRFP [NSF DGE-1144085]
  5. LDRD funds from Argonne National Laboratory
  6. DOE, Office of Basic Energy Sciences
  7. David and Lucile Packard Foundation
  8. UChicago MRSEC [NSF DMR-1420709]
  9. SHyNE, National Science Foundation's National Nanotechnology Coordinated Infrastructure [NSF NNCI-1542205]

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Quantum communication relies on the efficient generation of entanglement between remote quantum nodes, as entanglement is required to achieve and verify secure communications(1). Remote entanglement has been realized using a number of different probabilistic schemes(2,3), but deterministic remote entanglement has only been demonstrated recently, using a variety of superconducting circuit approaches(4-6). However, the deterministic violation of a Bell (i)nequality7, a strong measure of quantum correlation, has not been demonstrated so far in a superconducting quantum communication architecture, in part because achieving sufficiently strong correlation requires fast and accurate control of the emission and capture of the entangling photons. Here, we present a simple and robust architecture for achieving this benchmark result in a superconducting system.

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