Institute for Quantum Information Seminar

Series: Institute for Quantum Information Seminar

Device-independent quantum information

Velario Scarani, Centre for Quantum Technologies and Department of Physics, National University of Singapore,

Bell's inequalities can be seen as a family of entanglement witnesses, with a very special property: they detect entanglement without need of prior knowledge on the nature of the system or the measurements. For this reason, they can be used for ``device-independent" assessment.
In this talk, I shall review the main results in device-independent quantum cryptography [1], self-testing of a source of entanglement [2] and others; then I shall focus on randomness generation [3] and in particular on the case where the initial seed has imperfect randomness ("reduced measurement independence" or "reduced free will") [4].

[1] A. Acin et al., Phys. Rev. Lett. 98, 230501 (2007); L. Masanes, S. Pironio, A. Acin, Nat. Commun. 2, 238 (2011); E. Haenggi and R. Renner, arXiv:1009.1833v2.
[2] C.E. Bardyn et al., Phys. Rev. A 80, 062327 (2009); M. Mc Kague, T.H. Yang, V.S., arXiv:1203.2976, accepted in J. Phys. A: Math. Theor.
[3] S. Pironio et al., Nature 464, 1021 (2010).
[4] R. Colbeck, R. Renner, Nat. Phys. 8, 450 (2012); D. Koh et al., Phys. Rev. Lett. 109, 160404 (2012); R. Gallego et al., arXiv:1210.6514

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For more information, please contact Ann Harvey by phone at 626-395-4964 or by email at [email protected] or visit Institute for Quantum Information Seminar.