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. 2018 Mar 1;20(3):157. doi: 10.3390/e20030157

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Minimum secret key rate as a function of the channel losses; (b) Optimal choice of $χ_{hom}$ that maximizes the secret key rate in (a). The other parameters are $β = 0.99$ , $ε_{x} = 0.04$ , $V_{M} = 3$ , and $V_{y}^{B_{1}} \approx 1 + T_{x} ε_{x}$ .