Memory-efficient tracking of complex temporal and symbolic dynamics with quantum simulators

Thomas J Elliott, Andrew J P Garner, Mile Gu

Research output: Contribution to journalArticlepeer-review


Tracking the behaviour of stochastic systems is a crucial task in the statistical sciences. It has recently been shown that quantum models can faithfully simulate such processes whilst retaining less information about the past behaviour of the system than the optimal classical models. We extend these results to general temporal and symbolic dynamics. Our systematic protocol for quantum model construction relies only on an elementary description of the dynamics of the process. This circumvents restrictions on corresponding classical construction protocols, and allows for a broader range of processes to be modelled efficiently. We illustrate our method with an example exhibiting an apparent unbounded memory advantage of the quantum model compared to its optimal classical counterpart.
Original languageEnglish
Article number013021
Number of pages15
JournalNew Journal of Physics
Publication statusPublished - 28 Jan 2019


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