Sequential random access codes and self-testing of quantum measurement instruments

Article Article scientifique Article Sequential random access codes and self-testing of quantum measurement instruments eng 2019 author Mohan Karthik 872617 author Tavakoli Armin 861423 author Brunner Nicolas 510523 083034 10.1088/1367-2630/ab3773 1367-2630 https://iopscience.iop.org/article/10.1088/1367-2630/ab3773 Quantum Random Access Codes (QRACs) are key tools for a variety of protocols in quantum information theory. These are commonly studied in prepare-and-measure scenarios in which a sender prepares states and a receiver measures them. Here, we consider a three-party prepare-transform-measure scenario in which the simplest QRAC is implemented twice in sequence based on the same physical system. We derive optimal trade-off relations between the two QRACs. We apply our results to construct semi-device independent self-tests of quantum instruments, i.e. measurement channels with both a classical and quantum output. Finally, we show how sequential QRACs enable inference of upper and lower bounds on the sharpness parameter of a quantum instrument. Dewey 500.2 35 Groupe de physique appliquée 135 false New Journal of Physics 21 8 835377e5-9d27-4596-91f8-fa2592a654f0 Article (Accepted version) Public 1905.06726.pdf 318385 application/pdf openAccess Faculté des sciences / Section de physique / Groupe de physique appliquée

Title	Published in	Access level	OA Policy	Year	Views	Downloads

Sequential random access codes and self-testing of quantum measurement instruments	New Journal of Physics			2019	378	633

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Mohan, Karthik