Ultra-fast high-fidelity quantum gate for Rydberg atom arrays

As a promising quantum computing platform, Rydberg atom arrays have been the focus of efforts to improve gate speed and fidelity. Conventional protocols operate within the so-called Rydberg blockade regime, wherein near-by atoms cannot be simultaneously excited to Rydberg states due to strong interactions. While the blockade mechanism enables robust gate implementation, it also constraints the fundamental gate speed and, correspondingly, the best achievable fidelity. In this talk, we propose and analyze a new design framework for entangling gates with parametrically faster speed and higher fidelity. The key idea is to go beyond the Rydberg blockade regime, while ensuring the robustness by leveraging modern quantum information techniques such as quantum signal processing. Our approach attains the theoretical optimal fidelity scaling provable for simple model systems. We discuss how our gates can be implemented using the existing pulsed laser techniques, making it a viable path toward the next-generation quantum computing based on neutral atom arrays.