Experimental quantification of spatial correlations in quantum dynamics

Lukas Postler; Ángel Rivas; Philipp Schindler; Alexander Erhard; Roman Stricker; Daniel Nigg; Thomas Monz; Rainer Blatt; Markus Müller

doi:10.22331/q-2018-09-03-90

Experimental quantification of spatial correlations in quantum dynamics

Lukas Postler¹, Ángel Rivas^2,3, Philipp Schindler¹, Alexander Erhard¹, Roman Stricker¹, Daniel Nigg¹, Thomas Monz¹, Rainer Blatt^1,4, and Markus Müller⁵

¹Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria
²Departamento de Física Teórica I, Universidad Complutense, 28040 Madrid, Spain
³CCS-Center for Computational Simulation, Campus de Montegancedo UPM, 28660 Boadilla del Monte, Madrid, Spain
⁴Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Otto-Hittmair-Platz 1, A-6020 Innsbruck, Austria
⁵Department of Physics, College of Science, Swansea University, Singleton Park, Swansea - SA2 8PP, United Kingdom

Published:	2018-09-03, volume 2, page 90
Eprint:	arXiv:1806.08088v2
Doi:	https://doi.org/10.22331/q-2018-09-03-90
Citation:	Quantum 2, 90 (2018).

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Abstract

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 [Á. 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.

► BibTeX data

@article{Postler2018experimental,
  doi = {10.22331/q-2018-09-03-90},
  url = {https://doi.org/10.22331/q-2018-09-03-90},
  title = {Experimental quantification of spatial correlations in quantum dynamics},
  author = {Postler, Lukas and Rivas, {\'{A}}ngel and Schindler, Philipp and Erhard, Alexander and Stricker, Roman and Nigg, Daniel and Monz, Thomas and Blatt, Rainer and M{\"{u}}ller, Markus},
  journal = {{Quantum}},
  issn = {2521-327X},
  publisher = {{Verein zur F{\"{o}}rderung des Open Access Publizierens in den Quantenwissenschaften}},
  volume = {2},
  pages = {90},
  month = sep,
  year = {2018}
}

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Experimental quantification of spatial correlations in quantum dynamics

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