Randomness Extraction from Bell Violation with Continuous Parametric Down-Conversion

Shen, Lijiong and Lee, Jianwei and Thinh, Le Phuc and Bancal, Jean-Daniel and Cer`e, Alessandro and Lamas-Linares, Antia and Lita, Adriana and Gerrits, Thomas and Nam, Sae Woo and Scarani, Valerio and Kurtsiefer, Christian. (2018) Randomness Extraction from Bell Violation with Continuous Parametric Down-Conversion. Physical Review Letters, 121. p. 150402.

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We present a violation of the Clauser-Home-Shimony-Holt inequality without the fair sampling assumption with a continuously pumped photon pair source combined with two high efficiency superconducting detectors. Because of the continuous nature of the source, the choice of the duration of each measurement round effectively controls the average number of photon pairs participating in the Bell test. We observe a maximum violation of S = 2.016 02(32) with an average number of pairs per round of approximate to 0.32, compatible with our system overall detection efficiencies. Systems that violate a Bell inequality are guaranteed to generate private randomness, with the randomness extraction rate depending on the observed violation and on the repetition rate of the Bell test. For our realization, the optimal rate of randomness generation is a compromise between the observed violation and the duration of each measurement round, with the latter realistically limited by the detection time jitter. Using an extractor composably secure against quantum adversary with quantum side information, we calculate an asymptotic rate of approximate to 1300 random bits/s. With an experimental run of 43 min, we generated 617 920 random bits, corresponding to approximate to 240 random bits/s.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Quantum Physics (Sangouard)
UniBasel Contributors:Bancal, Jean-Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:16 Oct 2019 13:27
Deposited On:11 Oct 2019 12:32

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