Lattice Hamiltonian in superconducting multi-qubit processors - Part 2

Achieving fault-tolerant quantum computing in superconducting quantum processors requires a comprehensive understanding of interactions beyond simple pairwise couplings [1,2]. Following our Lattice Hamiltonian concept [3], We present a nonperturbative lattice Hamiltonian model for Google’s Sycamore processor. For each unit cell of the processor, we evaluate up to three-body interactions and explore parameter domains where unwanted stray interactions are minimized. Additionally, we identify intriguing regimes where three-body interactions dominate over two-body couplings. This lattice Hamiltonian approach offers valuable insights into the behavior of large-scale quantum processors and holds promise as a powerful tool for circuit design optimization.