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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

Spontaneous emission lifetime of a single trapped Ca(+) ion in a high finesse cavity.

A. Kreuter, +9 more
- 19 May 2004 - 
TL;DR: The spontaneous emission lifetime of a single trapped (40)Ca+ ion placed at different positions in the vacuum standing wave inside a high finesse cavity which is stabilized to the atomic transition is investigated.
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Surface noise analysis using a single-ion sensor

Nikos Daniilidis, +8 more
- 20 Jun 2014 - 
TL;DR: In this article, the authors used a single ion electric field sensor in combination with in situ surface treatment and analysis tools to investigate the relationship between electric field noise from metal surfaces in vacuum and the composition of the surface.
Journal ArticleDOI

Energy transport in trapped ion chains

Michael Ramm, +2 more
- 26 Jun 2014 - 
TL;DR: In this paper, the authors used a pulsed excitation scheme to rapidly add energy to the local motional mode of one of the trapped ions in the chain, and the subsequent energy readout allows them to determine how the excitation has propagated throughout the chain.
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Nonlinear coupling of continuous variables at the single quantum level

Christian F. Roos, +9 more
- 29 Apr 2008 - 
TL;DR: In this paper, the Coulomb interaction between cold ions stored in linear ion traps has been investigated and a nonlinear coupling between individual quanta of the vibrational modes of strings of cold ions was observed.
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Precision Measurement Method for Branching Fractions of Excited P 1 / 2 States Applied to Ca + 40

Michael Ramm, +4 more
- 09 Jul 2013 - 
TL;DR: A method for measuring branching fractions for the decay of J=1/2 atomic energy levels to lower-lying states based on time-resolved recording of the atom's fluorescence during a series of population transfers is presented.