10-Qubit Entanglement and Parallel Logic Operations with a Superconducting Circuit

Phys Rev Lett. 2017 Nov 3;119(18):180511. doi: 10.1103/PhysRevLett.119.180511. Epub 2017 Nov 3.


Here we report on the production and tomography of genuinely entangled Greenberger-Horne-Zeilinger states with up to ten qubits connecting to a bus resonator in a superconducting circuit, where the resonator-mediated qubit-qubit interactions are used to controllably entangle multiple qubits and to operate on different pairs of qubits in parallel. The resulting 10-qubit density matrix is probed by quantum state tomography, with a fidelity of 0.668±0.025. Our results demonstrate the largest entanglement created so far in solid-state architectures and pave the way to large-scale quantum computation.