61 citations · 219 across the 18 of their papers we have counts for
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Asymptotic correctability of Bell-diagonal qudit states and lower bounds on tolerable error probabilities in quantum cryptography
Kedar S. Ranade, Gernot Alber
The concept of asymptotic correctability of Bell-diagonal quantum states is generalised to elementary quantum systems of higher dimensions. Based on these results basic properties…
Postponement of dark-count effects in practical quantum key-distribution by two-way post-processing
Aeysha Khalique, Georgios M. Nikolopoulos, Gernot Alber
The influence of imperfections on achievable secret-key generation rates of quantum key distribution protocols is investigated. As examples of relevant imperfections, we consider t…
Completely positive covariant two-qubit quantum processes and optimal quantum NOT operations for entangled qubit pairs
J. Novotny, G. Alber, I. Jex
The structure of all completely positive quantum operations is investigated which transform pure two-qubit input states of a given degree of entanglement in a covariant way. Specia…
Selective recoupling and stochastic dynamical decoupling
O. Kern, G. Alber
An embedded selective recoupling method is proposed which is based on the idea of embedding the recently proposed deterministic selective recoupling scheme of Yamaguchi et al. [qua…
Error tolerance of two-basis quantum key-distribution protocols using qudits and two-way classical communication
Georgios M. Nikolopoulos, Kedar S. Ranade, Gernot Alber
We investigate the error tolerance of quantum cryptographic protocols using -level systems. In particular, we focus on prepare-and-measure schemes that use two mutually unbiased…