Large scale quantum walks by means of optical fiber cavities

Understand

We demonstrate a platform for implementing quantum walks that overcomes many of the barriers associated with photonic implementations.

• We use coupled fiber-optic cavities to implement time-bin encoded walks in an integrated system.
• We show that this platform can achieve very low losses combined with high-fidelity operations, enabling an unprecedented large number of steps in a passive system, as required for scenarios with multiple walkers.
• Furthermore the platform is reconfigurable, enabling variation of the coin, and readily extends to multidimensional lattices.