Journal
PHYSICAL REVIEW A
Volume 93, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.93.023821
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Funding
- ERC under the European Union's Seventh Framework Programme (FP7)/ERC Grant [319286]
- UK EPSRC [EP/K038311/1]
- National Research Foundation of Singapore
- Ministry of Education of Singapore
- Spanish grant [MINECO FIS2012-36673-C03-02]
- UPV/EHU [UFI 11/55]
- Basque Government [IT472-10]
- PROMISCE project
- SCALEQIT EU project
- Fondo Nacional de Desarrollo Cientifico y Tecnologico (FONDECYT, Chile) [1150653]
- EU Collaborative project QuProCS [641277]
- Engineering and Physical Sciences Research Council [EP/J010529/1, EP/K038311/1] Funding Source: researchfish
- EPSRC [EP/K038311/1, EP/J010529/1] Funding Source: UKRI
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In the present work we investigate the existence of multiple nonequilibrium steady states in a coherently driven XY lattice of dissipative two-level systems. A commonly used mean-field ansatz, in which spatial correlations are neglected, predicts a bistable behavior with a sharp shift between low- and high-density states. In contrast one-dimensional matrix product methods reveal these effects to be artifacts of the mean-field approach, with both disappearing once correlations are taken fully into account. Instead, a bunching-antibunching transition emerges. This indicates that alternative approaches should be considered for higher spatial dimensions, where classical simulations are currently infeasible. Thus we propose a circuit QED quantum simulator implementable with current technology to enable an experimental investigation of the model considered.
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