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Optimal universal quantum cloning and state estimation
D. Bruss, A. Ekert, C. Macchiavello
We derive a tight upper bound for the fidelity of a universal N to M qubit cloner, valid for any M \geq N, where the output of the cloner is required to be supported on the symmetr…
New Observables for Parity Violation in Atoms: Energy Shifts in External Electric Fields
D. Bruss, T. Gasenzer, O. Nachtmann
We consider hydrogen-like atoms in unstable levels of principal quantum number n=2, confined to a finite size region in a non-homogeneous electric field carrying handedness. The in…
Optimal Universal and State-Dependent Quantum Cloning
D. Bruss, D. P. DiVincenzo, A. Ekert +3
We establish the best possible approximation to a perfect quantum cloning machine which produces two clones out of a single input. We analyze both universal and state-dependent clo…
Quantum copying: A network
V. Buzek, S. L. Braunstein, M. Hillery +1
We present a network consisting of quantum gates which produces two imperfect copies of an arbitrary qubit. The quality of the copies does not depend on the input qubit. We also sh…
CP Violation in radiative Z Decays
D. Bruss, O. Nachtmann, P. Overmann
We propose to test the CP symmetry in the reactions Z -> mu+ mu- gamma and Z -> tau+ tau- gamma. The experimental analysis of angular correlations allows to determine a set of effe…