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

• URL: http://arxiv.org/abs/2512.10225v1
• Date: Thu, 11 Dec 2025 02:18:31 GMT
• Title: Integrated Generation and Purification of Entangled Coherent States for Non-Gaussian Teleportation
• Authors: Ananga Mohan Datta, William J. Munro, Nicolo Lo Piparo, Kae Nemoto,
• Abstract summary: Entangled coherent states (ECS) provide a powerful non-Gaussian resource for continuous quantum communication.<n>We propose an integrated photonic scheme that creates high-variable ECS from a two-mode squeezed vacuum.<n>We demonstrate high-fidelity transfer of both coherent states and Schrodinger cat states.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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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