High Success Probability, Fidelity, and Purity Nonlinear Optical Two-Qubit Gates on Chip

• URL: http://arxiv.org/abs/2607.03313v1
• Date: Fri, 03 Jul 2026 13:30:01 GMT
• Title: High Success Probability, Fidelity, and Purity Nonlinear Optical Two-Qubit Gates on Chip
• Abstract summary: Optical two-qubit gate with high success probability, fault-tolerant fidelity, and high-purity outputs is a fundamental yet unsolved challenge.<n>We propose a feasible scheme for such gate using thin-film lithium niobate platform, enabling chi(2) nonlinear photon-photon interaction with 100% efficiency.
• Score: 14.350788029473387
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Optical two-qubit gate with high success probability, fault-tolerant fidelity, and high-purity outputs is a fundamental yet unsolved challenge, essential for large-scale optical quantum computing toward quantum advantage. Here, we propose a feasible scheme for such gate using thin-film lithium niobate platform, enabling \c{hi}(2) nonlinear photon-photon interaction with 100% efficiency. By decoupling photon interaction and qubit flip operations, fidelity ceiling is removed, and output state purity is recovered by spectral-phase pre-compensation based on a full-spectral photon interaction model, yielding a CNOT gate with 84% success probability, 93% purity, and unity fidelity.

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