Demon-like algorithmic quantum cooling and its realization with quantum optics

Jin-Shi Xu
Man-Hong Yung
Xiao-Ye Xu
Zheng-Wei Zhou
Chuan-Feng Li
Alán Aspuru-Guzik
Guang-Can Guo
Nature Photonics, advance online publication(2014)


Simulation of the low-temperature properties of many-body systems remains one of the major challenges in theoretical and experimental quantum information science. We present, and demonstrate experimentally, a universal (pseudo) cooling method that is applicable to any physical system that can be simulated by a quantum computer. This method allows us to distil and eliminate hot components of quantum states like a quantum Maxwell's demon. The experimental implementation is realized with a quantum optical network, and the results are in full agreement with theoretical predictions (with fidelity higher than 0.978). Applications of the proposed pseudo-cooling method include simulations of the low-temperature properties of physical and chemical systems that are intractable with classical methods.

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