Reconfigurable circuit for mode tunable topological quantum structured light

• URL: http://arxiv.org/abs/2603.17716v2
• Date: Fri, 20 Mar 2026 07:08:41 GMT
• Title: Reconfigurable circuit for mode tunable topological quantum structured light
• Abstract summary: We introduce a compact, self-locking Mach-Zehnder interferometer that integrates digital spatial light modulators with static beam displacers.<n>The device also mimics the action of a reprogrammable parametric controlled-unitary gate, digitally driven by the spatial light modulator.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Structured light in the quantum regime has garnered considerable attention due to the opportunities it offers when mixing light's internal degrees of freedom, for high-dimensional and multi-dimensional quantum states of light. A popular example is to harness polarisation and spatial entangled photons with a shared topological invariant that is robust against numerous families of noisy quantum channels. Yet, producing such states with high purity and adaptability remains challenging. Here we introduce a compact, self-locking Mach-Zehnder interferometer that integrates digital spatial light modulators with static beam displacers to map spatial-mode entanglement from a parametric down-conversion source onto topological entanglement with high fidelity. The device also mimics the action of a reprogrammable controlled-unitary gate, digitally driven by the spatial light modulator. This approach is an enabling platform and provides a practical route to generating reliable, high-purity quantum-structured light with topological features, both at the single-photon level and as entangled states, a direction of growing topical interest.

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