Large scale quantum walks by means of optical fiber cavities

Abstract

We demonstrate a platform for implementing quantum walks that overcomes many\nof the barriers associated with photonic implementations. We use coupled\nfiber-optic cavities to implement time-bin encoded walks in an integrated\nsystem. We show that this platform can achieve very low losses combined with\nhigh-fidelity operations, enabling an unprecedented large number of steps in a\npassive system, as required for scenarios with multiple walkers. Furthermore\nthe platform is reconfigurable, enabling variation of the coin, and readily\nextends to multidimensional lattices. We demonstrate variation of the coin bias\nexperimentally for three different values.\n