Periodic conditional measurements on a photonic chip
Abstract
Quantum measurements not only extract information but also reshape quantum evolution through measurement backaction. Here, we investigate periodic conditional measurements, in which coherent evolution is repeatedly interrupted by local measurements. We show that the bright and dark modes of the conditional evolution operator provide a unified spectral description of both the post-selected final state along no-detection trajectories and the statistics of detection events. Using a three-dimensional photonic chip, we demonstrate on-demand state engineering through dark-mode preservation and bright-mode selection, enabling the protection of topological corner states and excited-state shelving. We further observe the predicted transition of the total detection probability on an effectively infinite one-dimensional lattice and identify its microscopic origin in Floquet near-dark modes. These results establish periodic conditional measurements as a general framework for engineering conditional quantum states and manipulating event-detection statistics in monitored quantum dynamics.
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BibTeX
@misc{chen2026periodic,
title = {{Periodic conditional measurements on a photonic chip}},
author = {Xuan Chen and Ruo-Yu Yin and Xiao-Wen Shang and Xi-Jun Yuan and Ze-Feng Lan and Hong-Jing Du and Yi-Jun Chang and Bao-Jing Liu and Wen-Hao Zhou and Xi Tan and Eli Barkai and Hao Tang and Xian-Min Jin},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.21465},
eprint = {2610.21465},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.21465},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Periodic conditional measurements on a photonic chip
AU - Xuan Chen
AU - Ruo-Yu Yin
AU - Xiao-Wen Shang
AU - Xi-Jun Yuan
AU - Ze-Feng Lan
AU - Hong-Jing Du
AU - Yi-Jun Chang
AU - Bao-Jing Liu
AU - Wen-Hao Zhou
AU - Xi Tan
AU - Eli Barkai
AU - Hao Tang
AU - Xian-Min Jin
PY - 2026
DA - 2026/10/15
PB - arXiv
DO - 10.48550/arxiv.2610.21465
UR - https://arxiv.org/abs/2610.21465
AB - Quantum measurements not only extract information but also reshape quantum evolution through measurement backaction. Here, we investigate periodic conditional measurements, in which coherent evolution is repeatedly interrupted by local measurements. We show that the bright and dark modes of the conditional evolution operator provide a unified spectral description of both the post-selected final state along no-detection trajectories and the statistics of detection events. Using a three-dimensional photonic chip, we demonstrate on-demand state engineering through dark-mode preservation and bright-mode selection, enabling the protection of topological corner states and excited-state shelving. We further observe the predicted transition of the total detection probability on an effectively infinite one-dimensional lattice and identify its microscopic origin in Floquet near-dark modes. These results establish periodic conditional measurements as a general framework for engineering conditional quantum states and manipulating event-detection statistics in monitored quantum dynamics.
ER -