Single-photon controlled phase shifts with colloidal quantum dots at room temperature.

Authors

Chai Hu, Wenyi Dai, Yuanyuan Zhou, Haiyu Xu, Jiefei Liu, Xingsheng Xu

Published in

Science advances. Volume 12. Issue 40. Pages eaee1340. Oct 02, 2026. Epub Oct 02, 2026.

Abstract

Quantum logic gates based on quantum electrodynamics (QED) in strong coupling regime between quantum dots and microcavities are key elements for scalable quantum computing and all-optical quantum networks. Here, a single colloidal quantum dot was site-selectively positioned onto a dielectric photonic crystal hybrid microcavity using a soft nanoprobe technique, enabling the study of strong coupling between the colloidal quantum dots and bound states in the continuum in the cavity. By combining photoluminescence spectroscopy, Michelson interferometry, and continuous-wave pump-probe technology, the wavelength- and power-dependent phase shifts were systematically characterized. Controlled π-phase shifts of a single photon were experimentally demonstrated in both single colloidal quantum dot and high-concentration colloidal quantum dots coupled microcavity systems. This work provides an experimental basis for the development of room temperature quantum optoelectronic devices, including quantum phase gates and ultralow power optical switches.

PMID:
42826209
Bibliographic data and abstract were imported from PubMed on 03 Oct 2026.

Read full publication at:
Please sign in to see all details.

Stats

1-terrible, 9-excellent. How would you rate this publication? Sign in in to submit your rating.

Post a comment

You need to be signed in to post comments. You can sign in here.

Comments

There are no comments yet.