Abstract

Time-bin entangled photons allow robust entanglement distribution over quantum networks. Integrated photonic circuits positioned at the nodes of a quantum network can perform the important functions of generating highly entangled photons and precisely manipulating their quantum state. In this Letter, we demonstrate time-bin entangled photon generation, noise suppression, wavelength division, and entanglement analysis on a single photonic chip utilizing low-loss double-stripe silicon nitride waveguide structures. Quantum state tomography results show $91\pm 0.7\%$ fidelity compared with the ideal state, indicating that highly entangled photons are generated and analyzed. This work represents a crucial step toward practical quantum networks.

© 2018 Optical Society of America

Compact and reconfigurable silicon nitride time-bin entanglement circuit

C. Xiong, X. Zhang, A. Mahendra, J. He, D.-Y. Choi, C. J. Chae, D. Marpaung, A. Leinse, R. G. Heideman, M. Hoekman, C. G. H. Roeloffzen, R. M. Oldenbeuving, P. W. L. van Dijk, C. Taddei, P. H. W. Leong, and B. J. Eggleton
Optica 2(8) 724-727 (2015)

50-GHz-spaced comb of high-dimensional frequency-bin entangled photons from an on-chip silicon nitride microresonator

Poolad Imany, Jose A. Jaramillo-Villegas, Ogaga D. Odele, Kyunghun Han, Daniel E. Leaird, Joseph M. Lukens, Pavel Lougovski, Minghao Qi, and Andrew M. Weiner
Opt. Express 26(2) 1825-1840 (2018)

On-chip generation of time-and wavelength-division multiplexed multiple time-bin entanglement

Wen-Tan Fang, Yin-Hai Li, Zhi-Yuan Zhou, Li-Xin Xu, Guang-Can Guo, and Bao-Sen Shi
Opt. Express 26(10) 12912-12921 (2018)

A silicon source of frequency-bin entangled photons

Federico Andrea Sabattoli, Linda Gianini, Angelica Simbula, Marco Clementi, Antonio Fincato, Frederic Boeuf, Marco Liscidini, Matteo Galli, and Daniele Bajoni
Opt. Lett. 47(23) 6201-6204 (2022)

Implementation of quantum state tomography for time-bin entangled photon pairs

Hiroki Takesue and Yuita Noguchi
Opt. Express 17(13) 10976-10989 (2009)