GHZ-Preserving Gates and Optimized Distillation Circuits

• URL: http://arxiv.org/abs/2510.25854v1
• Date: Wed, 29 Oct 2025 18:01:15 GMT
• Title: GHZ-Preserving Gates and Optimized Distillation Circuits
• Authors: Mingyuan Wang, Guus Avis, Stefan Krastanov,
• Abstract summary: Greenberger-Horne-Zeilinger (GHZ) states play a central role in quantum computing and communication protocols.<n>This work introduces an efficient enumeration and simulation method for circuits that preserve and distill noisy GHZ states.
• Score: 1.7484661165784237
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Greenberger-Horne-Zeilinger (GHZ) states play a central role in quantum computing and communication protocols, as a typical multipartite entanglement resource. This work introduces an efficient enumeration and simulation method for circuits that preserve and distill noisy GHZ states, significantly reducing the simulation complexity of a gate on $n$ qubits, from exponential $O(2^n)$ for standard state-vector methods or $O(n)$ for Clifford circuits, to a constant $O(1)$ for the method presented here. This method has profound implications for the design of quantum networks, where preservation and purification of entanglement with minimal resource overhead is critical. In particular, we demonstrate the use of the new method in an optimization procedure enabled by the fast simulation, that discovers GHZ distillation circuits far outperforming the state of the art. Fine-tuning to arbitrary noise models is possible as well. We also show that the method naturally extends to graph states that are local Clifford equivalent to GHZ states.

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