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- Title
Quantum read-out for cold atomic quantum simulators.
- Authors
Gluza, M.; Schweigler, T.; Rauer, B.; Krumnow, C.; Schmiedmayer, J.; Eisert, J.
- Abstract
Quantum simulators allow to explore static and dynamical properties of otherwise intractable quantum many-body systems. In many instances, however, the read-out limits such quantum simulations. In this work, we introduce an innovative experimental read-out exploiting coherent non-interacting dynamics. Specifically, we present a tomographic recovery method allowing to indirectly measure the second moments of the relative density fluctuations between two one-dimensional superfluids, which until now eluded direct measurements. Applying methods from signal processing, we show that we can reconstruct the relative density fluctuations from non-equilibrium data of the relative phase fluctuations. We employ the method to investigate equilibrium states, the dynamics of phonon occupation numbers and even to predict recurrences. The method opens a new window for quantum simulations with one-dimensional superfluids, enabling a deeper analysis of their equilibration and thermalization dynamics. Quantum simulators give access to quantum dynamics but for large systems it is difficult to read-out informative observables. By using precise modelling the authors demonstrate how to read-out expectation values of non-commuting sets of observables of phonons in cold atomic gases which gives information about their dynamics and thermodynamics.
- Subjects
QUANTUM dots; THERMODYNAMICS; PHONONS; SUPERFLUIDITY; SIGNAL processing
- Publication
Communications Physics, 2020, Vol 3, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-019-0273-y