Related papers: Generation and Detection of Hyperentangled Bell States at an Ultra-High Flux

Generation and Detection of Hyperentangled Bell States at an Ultra-High Flux

URL: http://arxiv.org/abs/2510.22677v1
Date: Sun, 26 Oct 2025 13:33:26 GMT
Title: Generation and Detection of Hyperentangled Bell States at an Ultra-High Flux
Authors: Netanel P. Yaish, Samata Gokhale, Avi Peer,
Abstract summary: We demonstrate the generation and detection of an ultra-high flux of polarization Bell states using broadband hyper-entangled bi-photons.<n>Bell states of polarization embody the most basic form of two-state entanglement, and are a key component of quantum protocols of communication and sensing.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: We demonstrate both the generation and detection of an ultra-high flux of polarization Bell states using broadband hyper-entangled bi-photons that are quantum-correlated in both polarization and time-energy. Bell states of polarization embody the most basic form of two-state entanglement, and are a key component of quantum protocols of communication and sensing. High-speed generation, processing and detection of polarization Bell-states is therefore critical for quantum technology. However, all current protocols that employ polarization entangled photons are inherently slow, primarily due to the photo-detectors (Photomultiplier tubes, avalanche photo-diodes, etc.) that can handle only $10^{6-7}$ photons/s, whereas sources may easily produce $10^{10-13}$ photons/s or more (if properly designed). We fully alleviate this detection bottleneck by resorting to physical detection of the bi-photons with nonlinear interferometry. We harness a generalized, dual polarization SU1,1 interferometer to generate, manipulate \textit{and measure} all the triplet Bell-states at a flux of $\sim\!5\times10^{11}$ photons/s, enhancing the speed of quantum processing by >5 orders of magnitude compared to standard methods.

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