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24 papers · 2 filters
Matter Wave Diffraction from an Inclined Transmission Grating: Searching for the Elusive He-4 Trimer Efimov State
R. Bruehl, A. Kalinin, O. Kornilov +3
The size of the helium trimer is determined by diffracting a beam of He-4 clusters from a 100 nm grating inclined by 21 degree. Due to the bar thickness the projected slit width is…
Concurrence of quasi pure quantum states
Florian Mintert, Andreas Buchleitner
We derive an analytic approximation for the concurrence of weakly mixed bipartite quantum states - typical objects in state of the art experiments. This approximation is shown to b…
Intercept-resend attacks in the Bennett-Brassard 1984 quantum key distribution protocol with weak coherent pulses
Marcos Curty, Norbert Lütkenhaus
Unconditional security proofs of the Bennett-Brassard protocol of quantum key distribution have been obtained recently. These proofs cover also practical implementations that utili…
Decoherence and multipartite entanglement
André R. R. Carvalho, Florian Mintert, Andreas Buchleitner
We study the dynamics of multipartite entanglement under the influence of decoherence. A suitable generalization of concurrence reveals distinct scaling of the entanglement decay r…
Toward high-precision values of the self energy of non-S states in hydrogen and hydrogen-like ions
Eric-Olivier Le Bigot, Ulrich D. Jentschura, Paul Indelicato +1
The method and status of a study to provide numerical, high-precision values of the self-energy level shift in hydrogen and hydrogen-like ions is described. Graphs of the self ener…
Web-assisted tunneling in the kicked harmonic oscillator
André R. R. Carvalho, Andreas Buchleitner
We show that heating of harmonically trapped ions by periodic delta kicks is dramatically enhanced at isolated values of the Lamb-Dicke parameter. At these values, quasienergy eige…