Verifying multipartite entangled Greenberger-Horne-Zeilinger states via multiple quantum coherences

被引：104

作者：

Wei, Ken X. ^{[1
]}

Lauer, Isaac ^{[1
]}

Srinivasan, Srikanth ^{[1
]}

Sundaresan, Neereja ^{[1
]}

McClure, Douglas T. ^{[1
]}

Toyli, David ^{[1
]}

McKay, David C. ^{[1
]}

Gambetta, Jay M. ^{[1
]}

Sheldon, Sarah ^{[1
]}

机构：

[1] IBM TJ Watson Res Ctr, Yorktown Hts, NY 10598 USA

来源：

PHYSICAL REVIEW A | 2020年 / 101卷 / 03期

关键词：

SCHRODINGER CAT STATES; GENERATION;

D O I：

10.1103/PhysRevA.101.032343

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

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页数：10

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