Single-photon controlled phase shifts with colloidal quantum dots at room temperature
- 1State Key Laboratory of Optoelectronic Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, P. R. China.
- 2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
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.
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BibTeX
@article{hu2026singlephoton,
title = {{Single-photon controlled phase shifts with colloidal quantum dots at room temperature}},
author = {Chai Hu and Wenyi Dai and Yuanyuan Zhou and Haiyu Xu and Jiefei Liu and Xingsheng Xu},
journal = {Science Advances},
year = {2026},
month = oct,
doi = {10.1126/sciadv.aee1340},
url = {https://www.science.org/doi/10.1126/sciadv.aee1340},
note = {CC BY-NC},
}
RIS
TY - JOUR
TI - Single-photon controlled phase shifts with colloidal quantum dots at room temperature
AU - Chai Hu
AU - Wenyi Dai
AU - Yuanyuan Zhou
AU - Haiyu Xu
AU - Jiefei Liu
AU - Xingsheng Xu
PY - 2026
DA - 2026/10/02
JO - Science Advances
DO - 10.1126/sciadv.aee1340
UR - https://www.science.org/doi/10.1126/sciadv.aee1340
AB - 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.
SN - 2375-2548
ER -