一句话：针对XX+YY耦合提出AshN门方案，统一实现任意两比特门，兼顾高保真与最优门数，形成复杂但精简的量子指令集。
量子指令集架构直接影响量子计算机性能。本文针对具有XX+YY耦合的量子比特提出AshN门方案，可直接、高效地实现任意两比特门（允许单比特门自由选择）。该方案既能支持高保真操作（尤其退相干主导误差时），又能覆盖两比特门的完整SU(4)群，从而在算法实现中取得最优两比特门数。二者协同形成复杂但精简的量子指令集（CRISC）。作者在通用n量子比特门合成、量子体积和量子比特路由等任务上评估，均观察到显著改进；方案还能以π/2g门时间实现局部等价于CNOT的门，并通过调整控制参数完全规避ZZ相干误差。
The design and architecture of a quantum instruction set are paramount to the performance of a quantum computer. This work introduces a gate scheme for qubits with XX + YY coupling that directly and efficiently realizes any two-qubit gate up to single-qubit gates. First, this scheme enables high-fidelity execution of quantum operations, especially when decoherence is the primary error source. Second, since the scheme spans the entire SU(4) group of two-qubit gates, we can use it to attain the optimal two-qubit gate count for algorithm implementation. These two advantages in synergy give rise to a quantum Complex yet Reduced Instruction Set Computer (CRISC). Though the gate scheme is compact, it supports a comprehensive array of quantum operations. This may seem paradoxical but is realizable due to the fundamental differences between quantum and classical computer architectures. Using our gate scheme, we observe marked improvements across various applications, including generic n-qubit gate synthesis, quantum volume, and qubit routing. Furthermore, the proposed scheme also realizes a gate locally equivalent to the commonly used CNOT gate with a gate time of π/2g, where g is the two-qubit coupling. The AshN scheme is also completely impervious to ZZ error, the main coherent error in transversely coupled systems, as the control parameters implementing the gates can be easily adjusted to take the ZZ term into account.
@inproceedings{Chen0GHY24,
title = {One Gate Scheme to Rule Them All: Introducing a Complex Yet Reduced Instruction Set for Quantum Computing},
author = {Jianxin Chen and Dawei Ding and Weiyuan Gong and Cupjin Huang and Qi Ye},
booktitle = {ASPLOS},
year = {2024},
doi = {10.1145/3620665.3640386}
}