Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics V

Q 62.73: Poster

Thursday, March 8, 2018, 16:15–18:15, Redoutensaal

Measurement of Quantum Memory Effects and its Fundamental Limitations — •Matthias Wittemer, Jan-Philipp Schröder, Govinda Clos, Ulrich Warring, Heinz-Peter Breuer, and Tobias Schaetz — Physikalisches Insitut, Albert-Ludwigs-Universität Freiburg

Any realistic quantum system interacts with its environment. Thereby, the open system builds up entanglement and correlations with the environment and exchanges information. Trapped ions offer unique control of internal and external degrees of freedom and are well-suited to engineer closed and open quantum systems. This enables systematic studies of entanglement, decoherence, and thermalization in quantum systems of variable complexity [1]. With our trapped-ion system we measure the flow of information in a closed quantum system and characterize associated memory effects [2]. Thereby, we reveal that the nature of projective measurements in quantum mechanics leads to a nontrivial bias in non-Markovianity measures. We precisely quantify such bias in our trapped-ion system in a regime where numerical simulations are still tractable. Thereby, we challenge current understandings of non-Markovian quantum dynamics by approaching from a most simple showcase [3]. A combination of extended measures for quantum memory effects and our scalable experimental approach can provide a versatile reference, relevant for understanding more complex systems.

[1] G. Clos et al., PRL 117, 170401 (2016), [2] H.-P. Breuer et al., PRL 103, 210401 (2009), [3] M. Wittemer et al., arXiv:1609.04158 (2016)