Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 3: Quantum Information: Concepts and Methods I
Q 3.2: Talk
Monday, February 29, 2016, 11:15–11:30, e214
Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres — •Andreas Reiserer1, 2, Bas Hensen1, 2, Hannes Bernien1, 2, Anais Dreau1, 2, Norbert Kalb1, 2, Machiel Blok1, 2, Juist Ruitenberg1, 2, David Elkouss2, Stephanie Wehner2, Tim Taminiau1, 2, and Ronald Hanson1, 2 — 1Kavli Institute of Nanoscience, TU Delft, The Netherlands — 2QuTech, TU Delft, The Netherlands
More than 50 years ago, John Bell proved that no theory of nature that obeys locality and realism can reproduce all the predictions of quantum theory. Meanwhile, many experiments that violate Bell’s inequality have been reported. However, all of these experiments relied on additional assumptions, most prominently the absence of signaling between the entangled particles, and fair-sampling of the full dataset when using inefficient detectors. Closing the loopholes that arise from these assumptions has been one of the major research goals of experimental quantum physics, with applications ranging from device independent quantum key distribution to the certification of random numbers.
In our experiment, we entangle two Nitrogen-vacancy (NV) centers in diamond that are located in independent setups at a distance of 1.3km. Efficient spin read-out avoids the fair-sampling assumption, while the use of fast random-basis selection and spin read-out ensure the required locality conditions. This has enabled us to perform a loophole-free test of Bell’s inequality.