Matthias Steffen, Martin Sandberg, et al.
Supercond Sci Technol
The ability to generate and verify multipartite entanglement is an important benchmark for near-term quantum devices. We develop a scalable entanglement metric based on multiple quantum coherences and demonstrate experimentally on a 20-qubit superconducting device. We report a state fidelity of 0.5165±0.0036 for an 18-qubit GHZ state, indicating multipartite entanglement across all 18 qubits. Our entanglement metric is robust to noise and only requires measuring the population in the ground state; it can be readily applied to other quantum devices to verify multipartite entanglement.
Matthias Steffen, Martin Sandberg, et al.
Supercond Sci Technol
George Zettles, Scott Willenborg, et al.
ISSCC 2022
Soo-hyon Phark, Yi Chen, et al.
APS March Meeting 2022
Suhas Vittal, Ali Javadi, et al.
MICRO 2024