Experimental quantification of spatial correlations in quantum dynamics
| Autor: | Markus Müller, Philipp Schindler, Daniel Nigg, Rainer Blatt, Thomas Monz, Alexander Erhard, Roman Stricker, Ángel Rivas, Lukas Postler |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Quantum Physics Physics and Astronomy (miscellaneous) Quantum dynamics Measure (physics) Time evolution FOS: Physical sciences 01 natural sciences lcsh:QC1-999 Atomic and Molecular Physics and Optics 010305 fluids & plasmas Quantum error correction Quantum process 0103 physical sciences Quantum system ddc:530 Statistical physics Quantum information 010306 general physics Quantum Physics (quant-ph) Quantum lcsh:Physics |
| Zdroj: | Quantum, Vol 2, p 90 (2018) Quantum 2, 90 (2018). doi:10.22331/q-2018-09-03-90 |
| DOI: | 10.48550/arxiv.1806.08088 |
| Popis: | Correlations between different partitions of quantum systems play a central role in a variety of many-body quantum systems, and they have been studied exhaustively in experimental and theoretical research. Here, we investigate dynamical correlations in the time evolution of multiple parts of a composite quantum system. A rigorous measure to quantify correlations in quantum dynamics based on a full tomographic reconstruction of the quantum process has been introduced recently [\'A. Rivas et al., New Journal of Physics, 17(6) 062001 (2015).]. In this work, we derive a lower bound for this correlation measure, which does not require full knowledge of the quantum dynamics. Furthermore we also extend the correlation measure to multipartite systems. We directly apply the developed methods to a trapped ion quantum information processor to experimentally characterize the correlations in quantum dynamics for two- and four-qubit systems. The method proposed and demonstrated in this work is scalable, platform-independent and applicable to other composite quantum systems and quantum information processing architectures. We apply the method to estimate spatial correlations in environmental noise processes, which are crucial for the performance of quantum error correction procedures. Comment: 17 pages, 9 figures, V2: Minor changes |
| Databáze: | OpenAIRE |
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