Long-range Entanglement Generation

Long-range entangling gates are highly desirable for solid-state devices. Improving the ability to achieve high-fidelity long-range CNOT gates is highly desirable in solid-state devices, where physical circuit architectures constrain effective device connectivity. These gates are particularly important for the large-scale implementation of algorithms like the quantum Fourier transform and fermionic simulations, and facilitate the use of non-local QEC codes such as quantum low-density parity-check (qLDPC) codes. Previous work by Bäumer et al. demonstrated teleportation of a CNOT gate using a measurement-based protocol across up to 100 lattice sites, achieving the highest fidelities for such tasks on superconducting processors at the time. We present a novel protocol for long-range CNOT gates that achieves superior performance across up to at least 40 lattice sites by relying primarily on unitary operations and incorporating error detection.

Below are my slides for the APS Global Summit 2025