Secret key capacity of the thermal-loss channel: improving the lower bound

Carlo Ottaviani; Riccardo Laurenza; Thomas P. W. Cope; Gaetana Spedalieri; Samuel L. Braunstein; Stefano Pirandola

doi:10.1117/12.2244899

24 October 2016 Secret key capacity of the thermal-loss channel: improving the lower bound

Carlo Ottaviani, Riccardo Laurenza, Thomas P. W. Cope, Gaetana Spedalieri, Samuel L. Braunstein, Stefano Pirandola

Proceedings Volume 9996, Quantum Information Science and Technology II; 999609 (2016) https://doi.org/10.1117/12.2244899
Event: SPIE Security + Defence, 2016, Edinburgh, United Kingdom

Abstract

We consider the secret key capacity of the thermal loss channel, which is modeled by a beam splitter mixing an input signal mode with an environmental thermal mode. This capacity is the maximum value of secret bits that two remote parties can generate by means of the most general adaptive protocols assisted by unlimited and two-way classical communication. To date, only upper and lower bounds are known. The present work improves the lower bound by resorting to Gaussian protocols based on suitable trusted-noise detectors.

Citation Download Citation

Carlo Ottaviani, Riccardo Laurenza, Thomas P. W. Cope, Gaetana Spedalieri, Samuel L. Braunstein, and Stefano Pirandola "Secret key capacity of the thermal-loss channel: improving the lower bound", Proc. SPIE 9996, Quantum Information Science and Technology II, 999609 (24 October 2016); https://doi.org/10.1117/12.2244899

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