Two-dimensional cavity grid for scalable quantum computation with superconducting circuits

TL;DR

This paper proposes a scalable 2D grid architecture of superconducting resonators and qubits for quantum computing, enabling efficient qubit coupling and fault-tolerance, advancing the development of large-scale quantum processors.

Contribution

It introduces a novel 2D cavity grid architecture that improves qubit coupling scalability and fault-tolerance in superconducting quantum computing.

Findings

Enables any two qubits to be coupled with minimal overhead.

Balances qubit frequency spread and cavity-induced couplings.

Supports fundamental elements of scalable fault-tolerant quantum computing.

Abstract

Superconducting circuits are among the leading contenders for quantum information processing. This promising avenue has been strengthened with the advent of circuit quantum electrodynamics, underlined by recent experiments coupling on-chip microwave resonators to superconducting qubits. However, moving towards more qubits will require suitable novel architectures. Here, we propose a scalable setup for quantum computing where such resonators are arranged in a two-dimensional grid with a qubit at each intersection. Its versatility allows any two qubits on the grid to be coupled at a swapping overhead independent of their distance and yields an optimal balance between reducing qubit transition frequency spread and spurious cavity-induced couplings. These features make this setup unique and distinct from existing proposals in ion traps, optical lattices, or semiconductor spins. We demonstrate that this approach encompasses the fundamental elements of a scalable fault-tolerant quantum computing architecture.