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• W3100668749 abstract "Symmetric informationally complete measurements (SICs) are elegant, celebrated, and broadly useful discrete structures in Hilbert space. We introduce a more sophisticated discrete structure compounded by several SICs. A SIC compound is defined to be a collection of d3 vectors in d-dimensional Hilbert space that can be partitioned in two different ways: into d SICs and into d2 orthonormal bases. While a priori their existence may appear unlikely when d>2, we surprisingly find an explicit construction for d=4. Remarkably this SIC compound admits a close relation to mutually unbiased bases, as is revealed through quantum state discrimination. Going beyond fundamental considerations, we leverage these exotic properties to construct a protocol for quantum key distribution and analyze its security under general eavesdropping attacks. We show that SIC compounds enable secure key generation in the presence of errors that are large enough to prevent the success of the generalization of the six-state protocol.Received 8 July 2020Accepted 14 August 2020DOI:https://doi.org/10.1103/PhysRevResearch.2.043122Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasQuantum communicationQuantum cryptographyQuantum foundationsQuantum measurementsGeneral PhysicsQuantum Information" @default.
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• W3100668749 date "2020-10-23" @default.
• W3100668749 modified "2023-10-11" @default.
• W3100668749 title "Compounds of symmetric informationally complete measurements and their application in quantum key distribution" @default.
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• W3100668749 doi "https://doi.org/10.1103/physrevresearch.2.043122" @default.
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