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4 papers · 2 filters
Optimal copying of entangled two-qubit states
J. Novotny, G. Alber, I. Jex
We investigate the problem of copying pure two-qubit states of a given degree of entanglement in an optimal way. Completely positive covariant quantum operations are constructed wh…
Quantum error correction of coherent errors by randomization
O. Kern, G. Alber, D. L. Shepelyansky
A general error correction method is presented which is capable of correcting coherent errors originating from static residual inter-qubit couplings in a quantum computer. It is ba…
A Pathwise Ergodic Theorem for Quantum Trajectories
Burkhard Kuemmerer, Hans Maassen
If the time evolution of an open quantum system approaches equilibrium in the time mean, then on any single trajectory of any of its unravelings the time averaged state approaches…
Robustness of the BB84 quantum key distribution protocol against general coherent attacks
Georgios M. Nikolopoulos, Gernot Alber
It is demonstrated that for the entanglement-based version of the Bennett-Brassard (BB84) quantum key distribution protocol, Alice and Bob share provable entanglement if and only i…