Abstract
Nonlocality is a fascinating and counterintuitive aspect of nature, revealed by the violation of a Bell inequality. The standard and easiest configuration in which Bell inequalities can be measured has been proposed by Clauser- Horne-Shimony-Holt (CHSH). However, alternative nonlocality tests can also be carried out. In particular, Bell inequalities requiring multiple measurement settings can provide deeper fundamental insights about quantum nonlocality, as well as offering advantages in the presence of noise and detection inefficiency. In this paper we show how these nonlocality tests can be performed using a commercially available source of entangled photon pairs. We report the violation of a series of these nonlocality tests (\(I_{3322}, I_{4422}\), and chained inequalities). With the violation of the chained inequality with 4 settings per side we put an upper limit at 0.49 on the local content of the states prepared by the source (instead of 0.63 attainable with CHSH). We also quantify the amount of true randomness that has been created during our experiment (assuming fair sampling of the detected events).
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Notes
- 1.
This chapter appeared as: “E. Pomarico, et al., Various quantum nonlocality tests with a commercial two-photon entanglement source, Phys. Rev. A 83, 052104 (2011).”
- 2.
Note that existing experimental results could be reinterpreted to provide such a bound as well.
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Note that existing experimental results could be reinterpreted to provide such a bound as well
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Acknowledgments
This work is supported by Qessence and NCCR-QP. We would like to thank Antonio Acin, Denis Rosset and Y.-C. Liang for valuable discussions, suggestions and remarks.
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Bancal, JD. (2014). Various Quantum Nonlocality Tests with a Commercial Two-photon Entanglement Source. In: On the Device-Independent Approach to Quantum Physics. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-01183-7_3
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