Year: 2026
Type: article
Abstract: Quantum computation and quantum simulation require a versatile gate set to optimize circuit compilation for practical applications. However, existing platforms are often limited to specific gate types or rely on parametric couplers to extend their gate set, which compromises scalability. Here, we propose a scalable quantum simulator with an extended gate set based on giant-atom three-level systems, which can be implemented with superconducting circuits. Unlike conventional small atoms, giant atoms couple to the environment at multiple points, introducing interference effects that allow exceptional tunability of their interactions. By leveraging this tunability, our setup supports both CZ and iSWAP gates through simple frequency adjustments, eliminating the need for parametric couplers. This dual-gate capability enhances circuit efficiency, reducing the overhead for quantum simulation. As a demonstration, we showcase the simulation of spin dynamics in dissipative Heisenberg XXZ spin chains, highlighting the setup's ability to tackle complex open quantum many-body dynamics. Finally, we discuss how a two-dimensional extension of our system could enable fault-tolerant quantum computation, paving the way for a universal quantum processor.
Source: Quantum
Authors: Guangze Chen, Anton Frisk Kockum
Institution: Chalmers University of Technology
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $215
Awards: QuantumStack: Programmering av kvantdatorn, G2106023419, G2511972022, G3731544974, G3957126812, G4725453400, Giant atoms - a new regime in quantum optics, G5442384851, Open Superconducting Quantum Computers (OpenSuperQPlus), G5987792135, G8206903934, Kvantsimulering och kvantkommunikation med stora atomer
OpenAlex ID: W4417299056