Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 5: Quantum information: Atoms and ions I
Q 5.3: Vortrag
Montag, 18. März 2013, 11:30–11:45, E 214
Generation of quantum discord between trapped atomic ions — Ben P. Lanyon1,2, •Petar Jurcevic1,2, Cornelius Hempel1,2, Rainer Blatt1,2, and Christian F. Roos1,2 — 1Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Technikerstr. 21A, 6020 Innsbruck, Austria — 2Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, 6020 Innsbruck, Austria
Quantum systems can be unentangled and yet correlated in a way that is not possible for classical systems. These correlations, which exist for mixed quantum states, can be quantified by the quantum discord. Like entanglement, discord is known to be useful in a range of information processing tasks.
In this work we show, experimentally, that discord can be generated by simple classical noise processes. First, starting from a state of two trapped ions with only classical correlations, we generate discord using local operations i.e. by manipulating of only one ion. Then we show that even stronger discordant correlations can be generated by collective dephasing channels.
Since entanglement cannot be generated via any of the above processes, these experiments highlight a fundamental difference between the two types of non-classical correlations. Our work contributes to the continuing research on distinguishing the quantum/classical boundary and the generated states will find application in quantum information processing tasks.