Skip to Main content Skip to Navigation
Journal articles

Semi-device-independent quantum money with coherent states

Abstract : The no-cloning property of quantum mechanics allows unforgeability of quantum banknotes and credit cards. Quantum credit card protocols involve a bank, a client and a payment terminal, and their practical implementation typically relies on encoding information on weak coherent states of light. Here, we provide a security proof in this practical setting for semi-device-independent quantum money with classical verification, involving an honest bank, a dishonest client and a potentially untrusted terminal. Our analysis uses semidefinite programming in the coherent state framework and aims at simultaneously optimizing over the noise and losses introduced by a dishonest party. We discuss secure regimes of operation in both fixed and randomized phase settings, taking into account experimental imperfections. Finally, we study the evolution of protocol security in the presence of a decohering optical quantum memory and identify secure credit card lifetimes for a specific configuration.
Complete list of metadatas

Cited literature [42 references]  Display  Hide  Download
Contributor : Mathieu Bozzio <>
Submitted on : Saturday, June 8, 2019 - 2:40:00 PM
Last modification on : Monday, October 12, 2020 - 1:22:20 PM


Files produced by the author(s)



Mathieu Bozzio, Eleni Diamanti, Frédéric Grosshans. Semi-device-independent quantum money with coherent states. Physical Review A, American Physical Society, 2019, 99 (2), pp.022336. ⟨10.1103/PhysRevA.99.022336⟩. ⟨hal-02151500⟩



Record views


Files downloads