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Published on: July 19, 2019
Quantum simulation of a system with competing two- and three-body interactions
Xinhua Peng1, Jingfu Zhang, Jiangfeng Du
1Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China. xhpeng@ustc.edu.cn
Researchers simulated quantum phase transitions in a system with competing interactions. They observed distinct ground states, including entangled states, using nuclear magnetic resonance (NMR) quantum simulation and adiabatic state changes.
Area of Science:
- Quantum physics
- Condensed matter theory
- Quantum information science
Background:
- Quantum phase transitions (QPTs) are fundamental phenomena occurring at zero temperature, driven by changes in system parameters.
- Systems with competing interactions can exhibit complex ground states, including entangled states, which are crucial for quantum technologies.
- Understanding and simulating these transitions are key to advancing quantum computing and materials science.
Purpose of the Study:
- To experimentally investigate quantum phase transitions in a system with competing one-, two-, and three-body interactions.
- To demonstrate the observation of different ground states and the transitions between them.
- To explore the role of genuine tripartite entanglement in these quantum phase transitions.
Main Methods:
- Experimental simulation using a Nuclear Magnetic Resonance (NMR) quantum simulator.
- Adiabatic manipulation of a coupling constant to drive the system through different ground states.
- Measurement of spin correlations and entanglement witnesses to characterize ground states and transitions.
Main Results:
- Successfully simulated a system exhibiting competing interactions, leading to distinct ground states.
- Observed both product states and states with genuine tripartite entanglement as ground states.
- Demonstrated the ability to distinguish these ground states and observe transitions via experimental measurements.
Conclusions:
- The study experimentally validates theoretical predictions for quantum phase transitions in complex interacting systems.
- NMR quantum simulation provides a viable platform for exploring entanglement and quantum phase transitions.
- Entanglement witnesses and correlation measurements are effective tools for characterizing quantum ground states and their dynamics.
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