# 10-qubit entanglement and parallel logic operations with a superconducting circuit

## TL;DR

This paper demonstrates the creation of 10-qubit entangled states and parallel quantum operations in a superconducting circuit, marking the largest entanglement in solid-state systems and advancing scalable quantum computing.

## Contribution

It reports the first production and tomography of 10-qubit GHZ states in a superconducting circuit with parallel operations and high fidelity.

## Key findings

- Achieved 10-qubit GHZ state with 66.8% fidelity
- Demonstrated parallel qubit-qubit interactions
- Largest entanglement in solid-state quantum systems

## Abstract

Here we report on the production and tomography of genuinely entangled Greenberger-Horne-Zeilinger states with up to 10 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 unambiguously probed, with a fidelity of $0.668 \pm 0.025$. Our results demonstrate the largest entanglement created so far in solid-state architectures, and pave the way to large-scale quantum computation.