Milz, S;
Pollock, FA;
Le, TP;
Chiribella, G;
Modi, K;
(2018)
Entanglement, non-Markovianity, and causal non-separability.
New Journal of Physics
, 20
, Article 033033. 10.1088/1367-2630/aaafee.
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Abstract
Quantum mechanics, in principle, allows for processes with indefinite causal order. However, most of these causal anomalies have not yet been detected experimentally. We show that every such process can be simulated experimentally by means of non-Markovian dynamics with a measurement on additional degrees of freedom. In detail, we provide an explicit construction to implement arbitrary a causal processes. Furthermore, we give necessary and sufficient conditions for open system dynamics with measurement to yield processes that respect causality locally, and find that tripartite entanglement and nonlocal unitary transformations are crucial requirements for the simulation of causally indefinite processes. These results show a direct connection between three counter-intuitive concepts: entanglement, non-Markovianity, and causal non-separability.
| Type: | Article |
|---|---|
| Title: | Entanglement, non-Markovianity, and causal non-separability |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/1367-2630/aaafee |
| Publisher version: | https://doi.org/10.1088/1367-2630/aaafee |
| Language: | English |
| Additional information: | Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence (http://creativecommons.org/licenses/by/3.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10091824 |
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