88 citations · 133 across the 3 of their papers we have counts for
4 papers · 1 filter
Testing Quantum Devices: Practical Entanglement Verification in Bipartite Optical Systems
Hauke Häseler, Tobias Moroder, Norbert Lütkenhaus
We present a method to test quantum behavior of quantum information processing devices, such as quantum memories, teleportation devices, channels and quantum key distribution proto…
Optimal unambiguous state discrimination of two density matrices: A second class of exact solutions
Philippe Raynal, Norbert Lütkenhaus
We consider the Unambiguous State Discrimination (USD) of two mixed quantum states. We study the rank and the spectrum of the elements of an optimal USD measurement. This naturally…
Nonlinear entanglement witnesses, covariance matrices and the geometry of separable states
Otfried Gühne, Norbert Lütkenhaus
Entanglement witnesses provide a standard tool for the analysis of entanglement in experiments. We investigate possible nonlinear entanglement witnesses from several perspectives.…
Security against eavesdropping in quantum cryptography
N. Lütkenhaus, Stephen M. Barnett
In this article we deal with the security of the BB84 quantum cryptography protocol over noisy channels using generalized privacy amplification. For this we estimate the fraction o…