Quantum walks with coins undergoing different quantum noisy channels |
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Institution: | 1. Department of Physics, Southeast University, Nanjing 211189, China;
2. Beijing Institute of Mechanical and Electrical Space, Beijing 100094, China |
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Abstract: | Quantum walks have significantly different properties compared to classical random walks, which have potential applications in quantum computation and quantum simulation. We study Hadamard quantum walks with coins undergoing different quantum noisy channels and deduce the analytical expressions of the first two moments of position in the longtime limit. Numerical simulations have been done, the results are compared with the analytical results, and they match extremely well. We show that the variance of the position distributions of the walks grows linearly with time when enough steps are taken and the linear coefficient is affected by the strength of the quantum noisy channels. |
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Keywords: | quantum walks quantum noisy channels |
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