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arXiv:1804.05979quant-ph

Quantum Blockchain using entanglement in time

Del Rajan, Matt Visser

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Abstract

We propose a conceptual design for a quantum blockchain. Our method involves encoding the blockchain into a temporal GHZ (Greenberger-Horne-Zeilinger) state of photons that do not simultaneously coexist. It is shown that the entanglement in time, as opposed to an entanglement in space, provides the crucial quantum advantage. All the subcomponents of this system have already been shown to be experimentally realized. Furthermore, our encoding procedure can be interpreted as nonclassically influencing the past.

arXiv comments
V1:5 pages; V2: now 7 pages; more discussion; more references; no changes in physics conclusions
Journal reference
Quantum Reports 1 # 1 (2019) 3--11
DOI
doi:10.3390/quantum1010002
Subjects
quant-phQuantum Physics cs.CRCryptography and Security q-fin.GNGeneral Finance

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