H
Hartmut Häffner
Researcher at University of California, Berkeley
Publications - 135
Citations - 10102
Hartmut Häffner is an academic researcher from University of California, Berkeley. The author has contributed to research in topics: Ion trap & Trapped ion quantum computer. The author has an hindex of 44, co-authored 134 publications receiving 9230 citations. Previous affiliations of Hartmut Häffner include Institute for Quantum Optics and Quantum Information & University of Mainz.
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Journal ArticleDOI
Trapped ions in optical lattices for probing oscillator chain models
TL;DR: In this paper, a chain of trapped ions embedded in microtraps generated by an optical lattice can be used to study oscillator models related to dry friction and energy transport.
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Local detection of quantum correlations with a single trapped ion
Manuel Gessner,Manuel Gessner,Michael Ramm,Thaned Pruttivarasin,Andreas Buchleitner,Heinz-Peter Breuer,Hartmut Häffner +6 more
TL;DR: In this article, a trapped-ion experiment demonstrates that correlations between the system and its environment can be detected without accessing or knowing anything about the environment or its interactions without access or knowledge of the environment.
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g j factor of an electron bound in a hydrogenlike ion
Thomas Beier,Ingvar Lindgren,Hans Persson,Sten Salomonson,Per Sunnergren,Hartmut Häffner,N. Hermanspahn +6 more
TL;DR: In this article, a detailed theoretical evaluation for the factor of a bound electron in hydrogen-like ions up to $Z=94$ is presented. But it is not possible to improve this precision with only minor effort since two-photon bound-state QED terms are uncalculated.
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Realization of Universal Ion-Trap Quantum Computation With Decoherence-Free Qubits
Thomas Monz,Kihwan Kim,Alessandro S. Villar,Alessandro S. Villar,Philipp Schindler,M. Chwalla,M. Riebe,Christian F. Roos,Hartmut Häffner,W. Hänsel,Markus Hennrich,Rainer Blatt,Rainer Blatt +12 more
TL;DR: This work demonstrates the realization of a universal set of quantum gates acting on decoherence-free ion qubits, and combines these gates to realize the first controlled-NOT gate towards a decoherent-free, scalable quantum computer.
Journal ArticleDOI
Robust entanglement
Hartmut Häffner,Ferdinand Schmidt-Kaler,W. Hänsel,Christian F. Roos,T. Körber,M. Chwalla,M. Riebe,J. Benhelm,Umakant D. Rapol,Christoph Becher,Rainer Blatt +10 more
TL;DR: In this paper, entangled states of two trapped Ca+ ions were investigated and robust entanglement lasting for more than 20 s was observed. But it is common belief among physicists that entangled states lose their coherence rather quickly.