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arXiv · 2512.10225

Integrated Generation and Purification of Entangled Coherent States for Non-Gaussian Teleportation

Ananga Mohan Datta·William J. Munro·Nicolo Lo Piparo·Kae Nemoto
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Abstract

Entangled coherent states (ECS) provide a powerful non-Gaussian resource for continuous-variable quantum communication, but their generation in scalable architectures remains challenging. We propose an integrated photonic scheme that creates high-fidelity ECS from a two-mode squeezed vacuum via photon subtraction in a symmetric waveguide trimer. The resulting non-Gaussian entanglement is further enhanced by single-photon catalysis, which purifies the distributed state after transmission through lossy channels. Using these purified ECS resources, we analyze a photon-number-based teleportation protocol and demonstrate high-fidelity transfer of both coherent states and Schrodinger cat states. In particular, the teleportation fidelity for cat states exceeds the classical threshold of 2/3 over a broad range of realistic channel and squeezing parameters, whereas Gaussian resources fail to do so. Our results show that integrated photon subtraction and catalysis enable practical, chip-compatible generation of non-Gaussian entanglement suitable for advanced quantum teleportation and continuous-variable quantum networks.

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Ananga Mohan Datta, William J. Munro, Nicolo Lo Piparo, Kae Nemoto. 2025-12-11. Integrated Generation and Purification of Entangled Coherent States for Non-Gaussian Teleportation. https://arxiv.org/abs/2512.10225

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