Polarization-Encoded Chiroptical Logic Operations Based on Chiral Plasmonic-Photonic Waveguides

Chiroptical logic gates encoded with circular polarization enable low-power operation and noise tolerance by using chiral selection as a built-in switching mechanism. However, current implementations compromise between miniaturization and loss for on-chip operation. Here, we demonstrate a spectrally integrated chiral nanophotonic platform where chiral gold helicoids generate circularly polarized emission from quantum dots, which directly couples into a low-loss hybrid waveguide mode supported by a silica top layer on a distributed Bragg mirror. This spectral alignment enables efficient chiral light generation, directional coupling, and propagation over tens of micrometers with preserved polarization purity. We exploit this robust chirality transfer to implement chirality-selective routing and demonstrate proof-of-concept chiral logic gates, including XNOR and ADDER operations with strong chiral contrast, minimal loss, and a compact footprint. This work establishes a versatile platform for chiral nanophotonics that provides a viable path toward practical polarization-encoded optical computation.