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This paper proposes a protocol for implementing multi-qubit fan-out (C^n) gates across spatially separated parties using a pre-shared GHZ state, local CNOTs, and feed-forward operations. Its claimed gains are fewer CNOT and Hadamard gates and higher success probabilities than decomposition-based methods, with two optical architectures for heralded and post-selected photonic implementations. These are theoretical results, so experimental feasibility remains to be shown, but the work addresses a real bottleneck for distributed quantum computing.
Scalable long-distance quantum fan-out gates with reduced resource overhead
arXiv:2610.18049v1 Announce Type: new Abstract: Scalable long-distance quantum gates are essential for distributed quantum computation and scalable quantum networks. We propose an efficient scheme for implementing an $n$-qubit fan-out gate $C^n$ (also known as a controlled-NOT-$\cdots$-NOT gate) across spatially separated parties. Our protocol requires only a pre-shared $n$-qubit Greenberger-Horne-Zeilinger state, $n$ local controlled-NOT (CNOT) gates, and feed-forward operations, thereby reducing both the CNOT and Hadamard gate counts by $(n-2)$ when compared with the standard decomposition-based approach. We further develop two optical architectures to implement the heralded and post-selected $n$-photon fan-out gates, respectively. These schemes require fewer single photons resources and achieve higher success probabilities than their decomposition-based counterparts, representing significant improvements. The results indicate that our approach is experimentally feasible and pave the way toward practical long-distance quantum computation.
Abstract:Scalable long-distance quantum gates are essential for distributed quantum computation and scalable quantum networks. We propose an efficient scheme for implementing an $n$-qubit fan-out gate $C^n$ (also known as a controlled-NOT-$\cdots$-NOT gate) across spatially separated parties. Our protocol requires only a pre-shared $n$-qubit Greenberger-Horne-Zeilinger state, $n$ local controlled-NOT (CNOT) gates, and feed-forward operations, thereby reducing both the CNOT and Hadamard gate counts by $(n-2)$ when compared with the standard decomposition-based approach. We further develop two optical architectures to implement the heralded and post-selected $n$-photon fan-out gates, respectively. These schemes require fewer single photons resources and achieve higher success probabilities than their decomposition-based counterparts, representing significant improvements. The results indicate that our approach is experimentally feasible and pave the way toward practical long-distance quantum computation.
arXiv:2610.18049 [quant-ph]
(or arXiv:2610.18049v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2610.18049 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
https://doi.org/10.1088/1367-2630/aeaf0f Focus to learn more DOI(s) linking to related resources
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