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Rydberg excitons in Cu2O can be an emergent platform for solid-state quantuminformation processing by utilizing the exaggerated properties of high-lyingexcited states within the material. To develop practical quantum systems,high-temperature operation is desirable. Here, we study thetemperature-dependence of the yellow and green Rydberg exciton resonances in athin Cu2O crystal via broad-band phonon-assisted absorption spectra between 4 Kand 100 K. At 4 K, we can identify the principal quantum number n = 11 yellowand n = 4 green Rydberg exciton states, beyond which we are limited by thespectral resolution of standard absorption techniques. Above liquid nitrogenboiling temperature (~80 K), the n = 6 yellow and n = 4 green Rydberg excitonstates are readily captured and higher-temperature yellow Rydberg excitonoptical properties still exhibit the standard scaling laws seen at lowtemperatures. This promising result lays the groundwork for a new route tobuild a high-temperature Rydberg quantum information processing architecturewith solid-state Cu2O.

Temperature Study of Rydberg Exciton Optical Properties in Cu2O