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. 2010 Sep 17;329(5998):1500-3.
doi: 10.1126/science.1193515.

Quantum walks of correlated photons

Alberto Peruzzo  1 , Mirko Lobino, Jonathan C F Matthews, Nobuyuki Matsuda, Alberto Politi, Konstantinos Poulios, Xiao-Qi Zhou, Yoav Lahini, Nur Ismail, Kerstin Wörhoff, Yaron Bromberg, Yaron Silberberg, Mark G Thompson, Jeremy L OBrien
Affiliations

Quantum walks of correlated photons

Alberto Peruzzo et al. Science. .

Abstract

Quantum walks of correlated particles offer the possibility of studying large-scale quantum interference; simulating biological, chemical, and physical systems; and providing a route to universal quantum computation. We have demonstrated quantum walks of two identical photons in an array of 21 continuously evanescently coupled waveguides in a SiO(x)N(y) chip. We observed quantum correlations, violating a classical limit by 76 standard deviations, and found that the correlations depended critically on the input state of the quantum walk. These results present a powerful approach to achieving quantum walks with correlated particles to encode information in an exponentially larger state space.

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