Efficient ultrafast homodyne detection of quantum light
Abstract
Ultrafast continuous-variable quantum states have potential applications in advanced quantum technologies, but efficient homodyne detection of these states remains challenging. Here, we present a method for efficient ultrafast homodyne detection by exploiting temporal correlations in detector signals. By optimizing the temporal weighting function used to extract quadrature outcomes, we achieve a substantial increase in the signal-to-noise ratio of ultrafast homodyne detection, thereby improving the detection efficiency. We analyze the autocorrelations of shot noise and electronic noise and determine the optimal weighting function by solving a generalized Rayleigh quotient problem. The optimal weighting function enhances the squeezing and anti-squeezing levels observed experimentally. These results highlight the importance of optimized signal processing for efficient quantum measurements.
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BibTeX
@article{yoon2026efficient,
title = {{Efficient ultrafast homodyne detection of quantum light}},
author = {Young-Do Yoon and Chan Roh and Geunhee Gwak and Young-Sik Ra},
journal = {Communications Physics},
year = {2026},
month = oct,
doi = {10.1038/s42005-026-02887-y},
url = {https://www.nature.com/articles/s42005-026-02887-y},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Efficient ultrafast homodyne detection of quantum light
AU - Young-Do Yoon
AU - Chan Roh
AU - Geunhee Gwak
AU - Young-Sik Ra
PY - 2026
DA - 2026/10/02
JO - Communications Physics
DO - 10.1038/s42005-026-02887-y
UR - https://www.nature.com/articles/s42005-026-02887-y
AB - Ultrafast continuous-variable quantum states have potential applications in advanced quantum technologies, but efficient homodyne detection of these states remains challenging. Here, we present a method for efficient ultrafast homodyne detection by exploiting temporal correlations in detector signals. By optimizing the temporal weighting function used to extract quadrature outcomes, we achieve a substantial increase in the signal-to-noise ratio of ultrafast homodyne detection, thereby improving the detection efficiency. We analyze the autocorrelations of shot noise and electronic noise and determine the optimal weighting function by solving a generalized Rayleigh quotient problem. The optimal weighting function enhances the squeezing and anti-squeezing levels observed experimentally. These results highlight the importance of optimized signal processing for efficient quantum measurements.
SN - 2399-3650
ER -