Demonstration of Weight-Four Parity Measurements in the Surface Code Architecture

Phys Rev Lett. 2016 Nov 18;117(21):210505. doi: 10.1103/PhysRevLett.117.210505. Epub 2016 Nov 18.

Abstract

We present parity measurements on a five-qubit lattice with connectivity amenable to the surface code quantum error correction architecture. Using all-microwave controls of superconducting qubits coupled via resonators, we encode the parities of four data qubit states in either the X or the Z basis. Given the connectivity of the lattice, we perform a full characterization of the static Z interactions within the set of five qubits, as well as dynamical Z interactions brought along by single- and two-qubit microwave drives. The parity measurements are significantly improved by modifying the microwave two-qubit gates to dynamically remove nonideal Z errors.