Quantum state processing through controllable synthetic temporal photonic lattices

This paper presents a scalable quantum processor based on a discrete-time quantum walk of time-bin-entangled photon pairs on synthetic temporal photonic lattices. The system, implemented on a coupled fiber-loop system, allows for path optimization of quantum state operations, generating two- and four-level time-bin entanglement and demonstrating two-photon interference. Dynamic control of the quantum walk increases coincidence counts and quantum interference measurements without post-selection. The results suggest that temporal synthetic dimensions can enable efficient quantum information processing for applications including quantum phase estimation, Boson sampling, and topological phases of matter.

Monika Monika, Farzam Nosrati, Agnes George, Stefania Sciara, Riza Fazili, André Luiz Marques Muniz, Arstan Bisianov, Rosario Lo Franco, William J. Munro, Mario Chemnitz, Ulf Peschel, Roberto Morandotti