Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 3: Quantum Information: Concepts and Methods I

Q 3.2: Vortrag

Montag, 29. Februar 2016, 11:15–11:30, e214

Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres — •Andreas Reiserer^{1, 2}, Bas Hensen^{1, 2}, Hannes Bernien^{1, 2}, Anais Dreau^{1, 2}, Norbert Kalb^{1, 2}, Machiel Blok^{1, 2}, Juist Ruitenberg^{1, 2}, David Elkouss², Stephanie Wehner², Tim Taminiau^{1, 2}, and Ronald Hanson^{1, 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.