Hannover 2010 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Quantum Effects: QED II / Interference and Correlations III
Q 30.7: Talk
Wednesday, March 10, 2010, 15:30–15:45, A 320
A new paradigm for non-locality by many single photon emitters - violations of locality for visibility less than 50% — •Ralph Wiegner1, Christoph Thiel1, Joachim von Zanthier1, and Girish S. Agarwal2 — 1Institut für Optik, Information und Photonik, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany — 2Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078-3072, USA
We investigate the spatial intensity-intensity correlations in the fluorescence light of multiple single-photon emitters and demonstrate that these correlations may violate locality. As it turns out, for N > 2 emitters, the widely-used CHSH inequalities are not suitable to prove the non-local character of the correlations. We therefore derive a new inequality, based on a Bell-Wigner-type inequality, of the form
| 0 ≤ x1 x4 − x1 x2 − x1 x3 + x2 x3 |
which holds for 0 ≤ x1, x2, x3 ≤ x4 ≤ 1. Using this inequality, we demonstrate the non-local character of the correlations even for a visibility of the signal below 50%. Our results apply to a wide variety of single photon emitters like trapped ions, quantum dots, molecules and nitrogen vacancies in diamonds.