Quantum Walks of Correlated Photons
2010
Peruzzo, Alberto | Lobino, Mirko | Matthews, Jonathan C.F. | Matsuda, Nobuyuki | Politi, Alberto | Poulios, Konstantinos | Zhou, Xiao-Qi | Lahini, Yoav | Ismail, Nur | Wörhoff, Kerstin | Bromberg, Yaron | Silberberg, Yaron | Thompson, Mark G. | OBrien, Jeremy L.
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 SiOxNy 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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