Disorder-Protected Quantum State Transmission through Helical Coupled-Resonator Waveguides

TL;DR

This paper demonstrates that helical coupled-resonator waveguides can preserve quantum photon indistinguishability despite disorder, making them promising for robust quantum communication and photonic applications.

Contribution

It introduces a novel helical waveguide design that suppresses disorder effects, enhancing quantum coherence preservation in photonic transmission.

Findings

H-CROWs exhibit pseudospin-momentum locking dispersion.

Photon indistinguishability is preserved in H-CROWs despite moderate disorder.

H-CROWs outperform regular CROWs in maintaining quantum coherence.

Abstract

We predict the preservation of temporal indistinguishability of photons propagating through helical coupled-resonator optical waveguides (H-CROWs). H-CROWs exhibit a pseudospin-momentum locked dispersion, which we show suppresses onsite disorder-induced backscattering and group velocity fluctuations. We simulate numerically the propagation of two-photon wavepackets, demonstrating that they exhibit almost perfect Hong-Ou-Mandel dip visibility and then can preserve their quantum coherence even in the presence of moderate disorder, in contrast to regular CROWs which are highly sensitive to disorder. As indistinguishability is the most fundamental resource of quantum information processing, H-CROWs may find applications for the implementation of robust optical links and delay lines in the emerging quantum photonic communication and computational platforms.