期刊
NEW JOURNAL OF PHYSICS
卷 22, 期 9, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/abb03e
关键词
discrete time crystals; ultra-cold atoms; Bayesian optimization
资金
- National Science Centre, Poland via Projects QuantERA programme [2017/25/Z/ST2/03027, 2016/20/W/ST4/00314, 2019/32/T/ST2/00413, 2018/31/B/ST2/00349]
- QuantERA ERANET Cofund in Quantum Technologies implemented within the European Unions Horizon 2020 Programme
- EPSRC [EP/R044082/1]
- Quantum Systems Engineering Skills and Training Hub at Imperial College London - EPSRC [EP/P510257/1]
- EPSRC [1801549, EP/R044082/1, EP/R043817/2] Funding Source: UKRI
A remarkable consequence of spontaneously breaking the time translational symmetry in a system, is the emergence of time crystals. In periodically driven systems, discrete time crystals (DTC) can be realized which have a periodicity that isntimes the driving period. However, all of the experimental observations have been performed for period-doubling and period-tripling DTC. Novel physics can arise by simulating many-body physics in the time domain, which would require a genuine realisation of then-tupling DTC. A system of ultra-cold bosonic atoms bouncing resonantly on an oscillating mirror is one of the models that can realise large period DTC. The preparation of DTC demands control in creating the initial distribution of the ultra-cold bosonic atoms along with the mirror frequency. In this work, we demonstrate that such DTC is robust against perturbations to the initial distribution of atoms. We show how Bayesian methods can be used to enhance control in the preparation of the initial state as well as to efficiently calculate the phase diagram for such a model. Moreover, we examine the stability of DTCs by analyzing quantum many-body fluctuations and show that they do not reveal signatures of heating.
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