Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 13: Open and Complex Quantum Systems I

FM 13.4: Talk

Montag, 23. September 2019, 15:00–15:15, 3042

Measurement of quantum memory effects in a trapped-ion system — •Matthias Wittemer, Govinda Clos, Ulrich Warring, Heinz-Peter Breuer, and Tobias Schaetz — University of Freiburg, Freiburg im Breisgau, Germany

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 a high level of control of internal (electronic) and external (motional) degrees of freedom and are well-suited to engineer closed and open quantum systems. This allows for systematic studies of entanglement, decoherence, and thermalization in quantum systems of variable complexity [1]. With our trapped-ion system we experimentally study the flow of information in a closed quantum system between an open subsystem and its environment and measure associated quantum memory effects [2]. Thereby, we reveal that the nature of projective measurements in quantum mechanics can lead to a nontrivial bias in a measure for the degree of quantum non-Markovian behavior [3]. We prepare the environment in different quantum states and realize different interactions between system and environment to characterize the non-Markovianity and its bias as a function of these parameters, illustrating the fundamental implications of our findings for future applications.

[1] G. Clos et al., Phys. Rev. Lett. 117, 170401 (2016)

[2] M. Wittemer et al., Phys. Rev. A 97, 020102(R) (2018)

[3] H.-P. Breuer et al., Phys. Rev. Lett. 103, 210401 (2009)