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Title: Computing secure key rates for quantum cryptography with untrusted devices
Authors: Tan, Ernest Y-Z
Schwonnek, Rene 
Goh, Koon Tong 
Primaatmaja, Ignatius William 
Lim, Charles C-W 
Issue Date: 29-Oct-2021
Publisher: Nature Research
Citation: Tan, Ernest Y-Z, Schwonnek, Rene, Goh, Koon Tong, Primaatmaja, Ignatius William, Lim, Charles C-W (2021-10-29). Computing secure key rates for quantum cryptography with untrusted devices. npj Quantum Information 7 (1) : 158. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Device-independent quantum key distribution (DIQKD) provides the strongest form of secure key exchange, using only the input–output statistics of the devices to achieve information-theoretic security. Although the basic security principles of DIQKD are now well understood, it remains a technical challenge to derive reliable and robust security bounds for advanced DIQKD protocols that go beyond the previous results based on violations of the CHSH inequality. In this work, we present a framework based on semidefinite programming that gives reliable lower bounds on the asymptotic secret key rate of any QKD protocol using untrusted devices. In particular, our method can in principle be utilized to find achievable secret key rates for any DIQKD protocol, based on the full input–output probability distribution or any choice of Bell inequality. Our method also extends to other DI cryptographic tasks. © 2021, The Author(s).
Source Title: npj Quantum Information
ISSN: 2056-6387
DOI: 10.1038/s41534-021-00494-z
Rights: Attribution 4.0 International
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