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Phase transitions in open quantum systems


Department of Physics

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About the Project

Developing accurate simulations of quantum mechanical systems unavoidably involves taking into account coupling to the outside world. Such modelling is important for a wide range of physical systems, whose quantum properties are now routinely measured in the lab. These include arrays of superconducting qubits[1], cold atoms in optical cavities[2] and semiconductor heterostructures[3]. In these systems fascinatingly complex behaviour occurs due to the competition between the many-body coherent effects and dissipative dynamics. This competition leads to the ability to engineer states which are difficult to realise by any other means. There are also regions of parameter space where, by careful tuning, it is possible for there to be sudden, dramatic changes in behaviour for very small changes in the control parameter realising dissipative phase transitions[4,5].

In some very specific cases these phase transitions are well understood[4,6]. These models are usually amenable to mean-field theory and the resulting transitions are very similar to their equilibrium counterparts. Recently, we have shown that this is not always the case[7] and transitions with very different characteristics can arise. In this project we will use state-of-the-art numerical techniques based on matrix product operators and neural networks to examine the kinds of physics which it is possible to realise in more complex lattice models.

Informal enquiries can be sent to me at [Email Address Removed]. For more information on our recent research see https://www.peterkirton.com/

Funding Notes

The studentship is fully funded (including fees + stipend) for 3.5 years, and UKRI eligibility criteria apply see https://epsrc.ukri.org/skills/students/guidance-on-epsrc-studentships/eligibility/ for more information.

References

[1] Fitzpatrick et al. PRX 7, 011016 (2017)
[2] Baumann et al Nature 464, 1301 (2010)
[3] Rodriguez et al PRL 118, 247402 (2017)
[4] Kessler et al PRA 86, 012116 (2012)
[5] Minganti et al PRA 98, 042118 (2018)
[6] Kirton et al Adv. Quant. Tech. 2, 1800043 (2019)
[7] Huber et al arXiv1908.02290 (2019)
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