Scalable long-distance quantum fan-out gates with reduced resource overhead
- 1Shijiazhuang Tiedao University
- 2University of Science and Technology Beijing
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- ⋯ -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.
Versions
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BibTeX
@article{liu2026scalable,
title = {{Scalable long-distance quantum fan-out gates with reduced resource overhead}},
author = {Wen-Qiang Liu and Hai-Rui Wei},
journal = {New Journal of Physics},
year = {2026},
month = oct,
doi = {10.1088/1367-2630/aeaf0f},
url = {https://iopscience.iop.org/article/10.1088/1367-2630/aeaf0f},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Scalable long-distance quantum fan-out gates with reduced resource overhead
AU - Wen-Qiang Liu
AU - Hai-Rui Wei
PY - 2026
DA - 2026/10/13
JO - New Journal of Physics
DO - 10.1088/1367-2630/aeaf0f
UR - https://iopscience.iop.org/article/10.1088/1367-2630/aeaf0f
AB - 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- ⋯ -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.
SN - 1367-2630
ER -