Experimental quantum forgery of quantum optical money

0478737 - FZÚ 2018 RIV GB eng J - Journal Article
Bartkiewicz, K. - Černoch, Antonín - Chimczak, G. - Lemr, K. - Miranowicz, A. - Nori, F.
Experimental quantum forgery of quantum optical money.
NPJ Quantum Information. Roč. 3, Mar (2017), s. 1-8, č. článku 7. E-ISSN 2056-6387
R&D Projects: GA ČR GAP205/12/0382
Institutional support: RVO:68378271
Keywords : experimental quantum forgery * quantum optical money
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 9.206, year: 2017

Unknown quantum information cannot be perfectly copied (cloned). This statement is the bedrock of quantum technologies and quantum cryptography, including the seminal scheme of Wiesner's quantum money, which was the first quantum-cryptographic proposal. Surprisingly, to our knowledge, quantum money has not been tested experimentally yet. Here, we experimentally revisit the Wiesner idea, assuming a banknote to be an image encoded in the polarization states of single photons. We demonstrate that it is possible to use quantum states to prepare a banknote that cannot be ideally copied without making the owner aware of only unauthorized actions. We provide the security conditions for quantum money by investigating the physically-achievable limits on the fidelity of 1-to-2 copying of arbitrary sequences of qubits. These results can be applied as a security measure in quantum digital right management.
Permanent Link: http://hdl.handle.net/11104/0274806