Shelly Garion, Naoki Kanazawa, et al.
PRResearch
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.
Shelly Garion, Naoki Kanazawa, et al.
PRResearch
Alexander Miessen, Daniel J. Egger, et al.
PRX Quantum
Ramachandran Muralidhar, Robert Dennard, et al.
S3S 2017
Thomas Attema, Vadim Lyubashevsky, et al.
CRYPTO 2020