Soliton-Based Electro-Optical Conversion in Cryogenic Exciton-Polariton Circuits

High-frequency readout of cryogenic logic circuits requires efficient transmission of signals from low-temperature stages to room-temperature electronics. A promising approach is in-situ electro-optical conversion, where electrical pulses are transformed into optical signals within the cryogenic environment and transmitted through optical fibers. We utilize exciton-polariton condensates in semiconductor coupled quantum wells to develop an energy-efficient, low-temperature electro-optical converter. The conversion process is modeled using the driven dissipative Gross–Pitaevskii equation in a long, quasi-one-dimensional optical channel within the semiconductor structure. Numerical simulations reveal that pulse spreading limits the

frequency response, motivating exploration of nonlinear, self-stabilized modes. In particular, soliton solutions of the equation maintain their shape through a balance of dispersion and nonlinearity. Our results indicate that soliton-like optical pulses could preserve signal integrity and extend operational bandwidth. This work paves the way toward energy-efficient, high-speed electro-optical interfaces based on exciton-polariton dynamics in advanced heterostructures.