- GSI Helmholtz Centre for Heavy Ion ResearchDE1k papers
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- Lawrence Berkeley National LaboratoryUS211 papers
8 papers · 2 filters
Stabilization of quantum information by combined dynamical decoupling and detected-jump error correction
Daniel Geberth, Oliver Kern, Gernot Alber +1
Two possible applications of random decoupling are discussed. Whereas so far decoupling methods have been considered merely for quantum memories, here it is demonstrated that rando…
Improved one-way rates for BB84 and 6-state protocols
Oliver Kern, Joseph M. Renes
We study the advantages to be gained in quantum key distribution (QKD) protocols by combining the techniques of local randomization, or noisy preprocessing, and structured (nonrand…
Hastening, delaying, or averting sudden death of quantum entanglement
A. R. P. Rau, Mazhar Ali, G. Alber
The finite time end of entanglement between two decohering qubits can be modified by local, unitary actions performed during the decohering process. Depending on the time when such…
Complex chaos in conditional qubit dynamics and purification protocols
T. Kiss, I. Jex, G. Alber +1
Selection of an ensemble of equally prepared quantum systems, based on measurements on it, is a basic step in quantum state purification. For an ensemble of single qubits, iterativ…
The Jamiołkowski isomorphism and a conceptionally simple proof for the correspondence between vectors having Schmidt number and -positive maps
Kedar S. Ranade, Mazhar Ali
Positive maps which are not completely positive are used in quantum information theory as witnesses for convex sets of states, in particular as entanglement witnesses and more gene…
Privacy Amplification, Private States, and the Uncertainty Principle
Joseph M. Renes, Jean-Christian Boileau
We show that three principle means of treating privacy amplification in quantum key distribution, private state distillation, classical privacy amplification, and via the uncertain…