Poled-fibre phase modulator for efficient high-dimensional quantum measurements
- URL: http://arxiv.org/abs/2608.04112v1
- Date: Tue, 04 Aug 2026 18:06:35 GMT
- Title: Poled-fibre phase modulator for efficient high-dimensional quantum measurements
- Abstract summary: We report the first use of a PFPM for active quantum-state measurements in a fully fiber-integrated platform.<n> Basis selection in our receiver for four-dimensional qudits is achieved using a single PFPM.<n>Results establish poled-fiber electro-optic modulation as a broadly applicable platform for high-efficiency detection in fiber-integrated quantum information processing.
- Score: 28.520791004292864
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Efficient detection of quantum states underpins advanced device-independent quantum-information protocols that provide the ultimate level of security for tasks including quantum random number generation and quantum key distribution (QKD). High-dimensional encoding is a natural route to boost the performance of such protocols, offering enhanced noise resilience and higher information capacity, yet their practical implementation remains challenging. A key experimental bottleneck in higher dimensions is the typical need of active modulators for basis selection, which incur substantial optical losses and polarization-sensitive operation. Poled optical fiber phase modulators (PFPMs) are a fiber-native electro-optic technology that naturally addresses these challenges, combining sub-dB insertion loss, intrinsic polarization independence, and direct compatibility with standard telecommunications fiber. Here we report the first use of a PFPM for active quantum-state measurements in a fully fiber-integrated platform. Basis selection in our receiver for four-dimensional qudits is achieved using a single PFPM, substantially simplifying the receiver architecture. As a benchmark, we perform a four-dimensional QKD session and obtain a finite secret-key rate per pulse that, to the best of our knowledge, surpasses all previously reported QKD demonstrations. Our results establish poled-fiber electro-optic modulation as a broadly applicable platform for high-efficiency detection in fiber-integrated quantum information processing.
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