Frankfurt 2006 – wissenschaftliches Programm
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A: Atomphysik
A 11: Ultrakalte Atomphysik III
A 11.2: Vortrag
Mittwoch, 15. März 2006, 10:55–11:10, H6
Precision spectroscopy with entangled states — •Michael Chwalla, Christian Roos, Dany Chek-al-kar, Mark Riebe, Jan Benhelm, Kihwan Kim, Piet Schmidt, Wolfgang Hänsel, Hartmut Häffner, Timo Körber und Rainer Blatt — Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck
The use of entangled states can provide an increased sensitivity in quantum-limited spectroscopic measurements, leading to an uncertainty that is inversely proportional to the number of particles instead of the usual square-law dependence.
In this contribution, we show that spectroscopy with maximally entangled states of atoms also offers significant advantages over experiments done with single atoms. As a first example, we demonstrate that entanglement of two 40Ca+ ions can be used for measuring tiny frequency shifts of the S1/2 → D5/2 transition arising from second-order Zeeman effect and electric quadrupole shifts due to the trapping potential. Secondly, we discuss how entanglement can be used to effectively eliminate first-order Zeeman shifts in spectroscopy with 40Ca+ even though there are no m=0 → m=0 transitions.