Experimental realization of one-dimensional optical quantum walks

doi:10.1088/1674-1056/23/11/110307

中国物理B ›› 2014, Vol. 23 ›› Issue (11): 110307-110307.doi: 10.1088/1674-1056/23/11/110307

Experimental realization of one-dimensional optical quantum walks

薛鹏^{a b}, 秦豪^a, 唐宝^a, 詹翔^a, 边志浩^a, 李剑^a

a Department of Physics, Southeast University, Nanjing 211189, China;
b State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China

收稿日期:2014-04-22 修回日期:2014-05-28 出版日期:2014-11-15 发布日期:2014-11-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11174052 and 11474049), the National Basic Research Development Program of China (Grant No. 2011CB921203), and the Open Fund from the State Key Laboratory of Precision Spectroscopy of East China Normal University, China.

Experimental realization of one-dimensional optical quantum walks

Xue Peng (薛鹏)^{a b}, Qin Hao (秦豪)^a, Tang Bao (唐宝)^a, Zhan Xiang (詹翔)^a, Bian Zhi-Hao (边志浩)^a, Li Jian (李剑)^a

a Department of Physics, Southeast University, Nanjing 211189, China;
b State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China

Received:2014-04-22 Revised:2014-05-28 Online:2014-11-15 Published:2014-11-15
Contact: Xue Peng E-mail:gnep.eux@gmail.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11174052 and 11474049), the National Basic Research Development Program of China (Grant No. 2011CB921203), and the Open Fund from the State Key Laboratory of Precision Spectroscopy of East China Normal University, China.

摘要/Abstract

摘要： We analyze the process of a discrete-time quantum walk over 4 steps and 5 positions with linear optics elements. The quantum walk is characterized by a ballistic spread of wavepackets along 4 steps. By employing different initial coin states, we observe non-Gaussian distribution of the walkers' finial position, which characterizes a quadratic enhancement of the spread of photon wavepackets compared to a classical random walk. By introducing controllable decoherence, we observe the quantum-to-classical transmission in a quantum walk architecture.

关键词: quantum walk, quantum-to-classical transmission, decoherence

Abstract: We analyze the process of a discrete-time quantum walk over 4 steps and 5 positions with linear optics elements. The quantum walk is characterized by a ballistic spread of wavepackets along 4 steps. By employing different initial coin states, we observe non-Gaussian distribution of the walkers' finial position, which characterizes a quadratic enhancement of the spread of photon wavepackets compared to a classical random walk. By introducing controllable decoherence, we observe the quantum-to-classical transmission in a quantum walk architecture.

Key words: quantum walk, quantum-to-classical transmission, decoherence

中图分类号: (Entanglement measures, witnesses, and other characterizations)

03.67.Mn

03.65.Ta (Foundations of quantum mechanics; measurement theory) 05.40.Fb (Random walks and Levy flights) 03.67.Ac (Quantum algorithms, protocols, and simulations)

薛鹏, 秦豪, 唐宝, 詹翔, 边志浩, 李剑. Experimental realization of one-dimensional optical quantum walks[J]. 中国物理B, 2014, 23(11): 110307-110307.

Xue Peng (薛鹏), Qin Hao (秦豪), Tang Bao (唐宝), Zhan Xiang (詹翔), Bian Zhi-Hao (边志浩), Li Jian (李剑). Experimental realization of one-dimensional optical quantum walks[J]. Chin. Phys. B, 2014, 23(11): 110307-110307.

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Experimental realization of one-dimensional optical quantum walks

Experimental realization of one-dimensional optical quantum walks

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