High-resolution tunable frequency beamsplitter enabled by an integrated silicon pulse shaper

• URL: http://arxiv.org/abs/2601.23028v1
• Date: Fri, 30 Jan 2026 14:37:44 GMT
• Title: High-resolution tunable frequency beamsplitter enabled by an integrated silicon pulse shaper
• Abstract summary: We demonstrate high-fidelity, tunable, and ultrafine-resolution on-chip frequency beamsplitters using a quantum frequency processor based on an integrated pulse shaper with six spectral channels.<n>System's support of frequency spacings as narrow as 2 GHz significantly surpasses prior bulk demonstrations.<n>Results establish a scalable and resource-efficient platform for integrated frequency-bin quantum photonics.
• Score: 0.45507178426690215
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We demonstrate high-fidelity, tunable, and ultrafine-resolution on-chip frequency beamsplitters using a quantum frequency processor based on an integrated pulse shaper with six spectral channels. Near-ideal Hadamard gate performance is achieved, with fidelity F > 0.9995 and modified success probability P > 0.9621 maintained across frequency spacings from 2-5 GHz and down to as few as four spectral pulse shaper channels. The system's support of frequency spacings as narrow as 2 GHz significantly surpasses prior bulk demonstrations and enables arbitrary splitting ratios via spectral phase or modulation index control. These results establish a scalable and resource-efficient platform for integrated frequency-bin quantum photonics, opening new directions in quantum information processing, including densely parallel single-qubit operations and multidimensional gate implementations.

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