Experimental realization of one-dimensional optical quantum walks

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

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.

Keywords: quantum walk quantum-to-classical transmission decoherence

Received: 22 April 2014
Revised: 28 May 2014
Accepted manuscript online:

PACS:	03.67.Mn	(Entanglement measures, witnesses, and other characterizations)
	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)

Fund: 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.

Corresponding Authors: Xue Peng
E-mail: gnep.eux@gmail.com

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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 2014 Chin. Phys. B 23 110307

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