English

Long-Range Entangling Operations via Josephson Junction Metasurfaces

Quantum Physics 2025-06-19 v1

Abstract

We present a framework for implementing two-qubit entangling operations between distant superconducting qubits using a space-time modulated Josephson junction metasurface. By modulating the surface in both space and time, we engineer sidebands with controllable wavevectors that selectively couple target qubits. The metasurface acts as a reconfigurable coupling medium, where the interaction strength is determined by engineered transmission coefficients rather than by exponentially decaying near-field coupling, thus reducing the dependence on physical proximity. We investigated the implementation of two-qubit interactions via iSWAP gates driven resonantly through the metasurface and controlled phase gates via geometric phase accumulation. Simulations show entangling fidelity exceeding 98% maintained over centimeter scale separations.

Keywords

Cite

@article{arxiv.2506.14958,
  title  = {Long-Range Entangling Operations via Josephson Junction Metasurfaces},
  author = {Mustafa Bakr},
  journal= {arXiv preprint arXiv:2506.14958},
  year   = {2025}
}
R2 v1 2026-07-01T03:22:44.026Z