Program

LSU SQuInT Event Map

SESSION 7: Quantum optics experiments and Bell-inequality test (Theatre)

Chair: (Elohim Becerra (CQuIC, New Mexico))
10:15am -11:00amLinda Sansoni, Paderborn
On chip nonlinear quantum devices

Abstract. In the last years the challenge of showing quantum supremacy has greatly attracted the interest of the scientific community. In this context the adoption of integrated photonic platforms has shown a great potential to finally confirm the advantage of using quantum resources compared to classical ones. Integrated photonics is indeed an optimal candidate for the experimental implementation of highly complex and compact quantum circuits. Despite the enormous development in this field, one of the major issues still remains a reliable and efficient generation of quantum states of light. Integrated waveguide sources have suitable features for this purpose as high brightness and stability. Nevertheless requirements as generation of light on different spatial modes or the possibility to operate the devices outside the lab, are still a major challenge. Here we present how we address these challenges by exploiting new waveguide designs in lithium niobate substrates and the adoption of fiber-hybrid technology. Our devices range from multichannel sources of entangled states to a fully plug and play source of heralded single photons. With these achievements we bring the quantum technology to a next level of development and a step closer to the adoption of a fully integrated platform for quantum information applications.

11:00am - 11:30amPeter Bierhorst, NIST Boulder
Experimentally generated random numbers certified by the impossibility of superluminal signaling

Abstract. Random numbers are an important resource for applications such as numerical simulation and secure communication. However, it is difficult to certify whether a physical random number generator is truly unpredictable. Here, we exploit the phenomenon of quantum entanglement in a loophole-free photonic Bell test experiment to obtain data containing randomness that cannot be predicted within any non-superdeterministic physical theory that does not also allow the sending of signals faster than the speed of light. To certify and quantify the randomness, we develop a new protocol that performs well in an experimental regime characterized by low violation of Bell inequalities. Applying an extractor function to our data, we obtain 256 new random bits, uniform to within 10-3.

11:30am - 12:00pmYong Wan, NIST
Chained Bell inequality experiment with high-efficiency measurements

Abstract. Recent Bell test experiments that have demonstrated violation of Bell inequalities, have successfully falsified theories of local realism [1-3]. A chained Bell inequality experiment [4], a generalization of the standard Clauser-Horne-Shimony-Holt experiment, utilizes 2N different pairs of measurement settings. The correlations observed in such an experiment can be modeled as a mixture of a local-realistic distribution and a “non-local” distribution that maximally violates the inequality. Using a chained Bell inequality, one can set an upper limit on the fraction of the mixture that satisfies local realism [5-7]. Here, we describe a chained Bell inequality experiment on trapped ions. An entangled pair of trapped Be+ ions is generated using a Mølmer-Sørensen gate [8]. The individual measurement settings are randomized and applied to the ions via single qubit operations. The ions are measured individually with high efficiency. We quantify the local-realistic fraction to be below 0.327 at the 95% confidence level without the fair-sampling or independent-and-identical-distributions assumptions. This work was supported by IARPA, ONR, and the NIST Quantum Information Program. [1] B. Hensen et al., Nature 526, 682 (2015). [2] L. K. Shalm et al, Phys. Rev. Let. 115 250402 (2015). [3] M. Giustina et al., Phys. Rev. Let. 115 250401 (2015). [4] P. M. Pearle, Phys. Rev. D 2, 1418 (1970). [5] A. C. Elitzur, S. Popescu, and D. Rohrlich, Phys. Lett. A 162, 25 (1992). [6] J. Barrett, A. Kent, and S. Pironio, Phys. Rev.Lett. 97, 170409 (2006). [7] P. Bierhorst, J. Phys. A: Math. Theor. 49 215301 (2016). [8] J. P. Gaebler et al., Phys. Rev. Lett. 117, 060505 (2016).

SQuInT Chief Organizer
Akimasa Miyake, Assistant Professor
amiyake@unm.edu

SQuInT Co-Organizer
Mark M. Wilde, Assistant Professor LSU
mwilde@phys.lsu.edu

SQuInT Administrator
Gloria Cordova
gjcordo1@unm.edu
505 277-1850

SQuInT Event Coordinator
Karen Jones, LSU
kjones@cct.lsu.edu

SQuInT Founder
Ivan Deutsch, Regents' Professor
ideutsch@unm.edu

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