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Conference on Lasers and Electro-Optics

Topologically Protected Entangled Photon Pairs in Honeycomb Photonic Crystals

Zhen Jiang, Chaoxiang Xi, Guangqiang He, Chun Jiang

Published Jan 1, 2022• 0 citations
Publisher

Abstract

We propose a topological insulator supporting topologically protected entangled photon pairs. The continuous frequency entanglement between photon pairs generated from the four-wave mixing process is theoretically clarified.
DOI
10.1364/cleo_at.2022.jw3b.82

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Abstract The concepts of topological phases have been widely exploited in quantum optics in recent years. Here we demonstrate a topological insulator implementing topological protection of correlated biphoton states. A degenerate four-wave mixing (FWM) process of pseudospin states propagating along the topological interface is numerically simulated. Strikingly, the signal and idler photons generated from the FWM process are clarified to be entangled between two degrees of freedom—the frequencies of photon pairs and their time of arrival. The topological edge states of the pump, signal, and idler are robust against the sharp bends and defects, revealing the topological protection of energy-time entangled biphoton states. These findings could pave the way for unprecedented topological quantum devices.
The efficient generation of non-classical light at the micro- and nanoscale is central to the development of quantum technologies. Integrated photonic structures offer new opportunities for increasing the generation efficiency and control of the quantum state of non-classical light. Recently, photonic structures based on topology conservation have been proposed as platforms to overcome issues associated with disorder and fabrication imperfections. For instance, it has been suggested that topological edge states can be exploited for the generation of photon pairs having robust spectral correlations [1]. More recently, the effect of topology on path correlations of photon pairs generated by spontaneous four-wave mixing (SFWM) in waveguide arrays has also been investigated [2].