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8 papers · 2 filters
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…
Creation of macroscopic superposition states from arrays of Bose-Einstein condensates
J. A. Dunningham, K. Burnett, R. Roth +1
We consider how macroscopic quantum superpositions may be created from arrays of Bose-Einstein condensates. We study a system of three condensates in Fock states, all with the same…
Structured Codes Improve the Bennett-Brassard-84 Quantum Key Rate
Graeme Smith, Joseph M. Renes, John A. Smolin
A central goal in information theory and cryptography is finding simple characterizations of optimal communication rates subject to various restrictions and security requirements.…
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…
Noisy Preprocessing and the Distillation of Private States
Joseph M. Renes, Graeme Smith
We provide a simple security proof for prepare & measure quantum key distribution protocols employing noisy processing and one-way postprocessing of the key. This is achieved by sh…