Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 7: Quantum Information: Concepts and Methods 1
Q 7.4: Talk
Monday, March 14, 2011, 11:15–11:30, SCH A118
Multi-partite entanglement in a driven qubit network — •Simeon Sauer1, Florian Mintert1,2, and Andreas Buchleitner1 — 1Physikalisches Institut, Albert-Ludwigs-Universität, Hermann-Herder-Str. 3, D-79104 Freiburg, Germany — 2Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität Freiburg, Albertstraße 19, D-79104 Freiburg, Germany
As demonstrated recently [1,2], periodic driving of a composite quantum system can induce entanglement that significantly exceeds the threshold of the static case. Alike general resonance phenomena this enhancement of entanglement occurs for very specific amplitudes and frequencies of the driving fields.
We aim to develop a general understanding of the underlying mechanisms. To this end, we consider a multi-partite quantum system that consists of several weakly coupled spins and study the interplay of periodic driving and multi-partite entanglement within the Floquet picture; i.e. we identify the dressed states of the driven system and quantify their entanglement by means of a multi-partite entanglement measure. Indeed, at well-defined values of the driving frequency and amplitude, we find a resonant behavior of entanglement. The occurrence of these resonances can be understood in terms of the single particle Floquet spectra only, what permits to predict resonances without solving the underlying many-body problem.
[1] Galve et al., Phys. Rev. A 79, 032332 (2009).
[2] Cai et al., Phys. Rev. E 82, 021921 (2010).