Implementing arbitrary multi-mode continuous-variable quantum gates with fixed non-Gaussian states and adaptive linear optics

• URL: http://arxiv.org/abs/2405.19067v2
• Date: Fri, 26 Jul 2024 11:05:03 GMT
• Title: Implementing arbitrary multi-mode continuous-variable quantum gates with fixed non-Gaussian states and adaptive linear optics
• Authors: Fumiya Hanamura, Warit Asavanant, Hironari Nagayoshi, Atsushi Sakaguchi, Ryuhoh Ide, Kosuke Fukui, Peter van Loock, Akira Furusawa,
• Abstract summary: Non-Gaussian quantum gates are essential components for optical quantum information processing. We propose a measurement-based method to directly implement general, multi-mode, and higher-order non-Gaussian gates.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Non-Gaussian quantum gates are essential components for optical quantum information processing. However, the efficient implementation of practically important multi-mode higher-order non-Gaussian gates has not been comprehensively studied. We propose a measurement-based method to directly implement general, multi-mode, and higher-order non-Gaussian gates using only fixed non-Gaussian ancillary states and adaptive linear optics. Compared to existing methods, our method allows for a more resource-efficient and experimentally feasible implementation of multi-mode gates that are important for various applications in optical quantum technology, such as the two-mode cubic quantum non-demolition gate or the three-mode continuous-variable Toffoli gate, and their higher-order extensions. Our results will expedite the progress toward fault-tolerant universal quantum computing with light.

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