期刊
PHYSICAL REVIEW LETTERS
卷 127, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.230503
关键词
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资金
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- National Fundamental Research Program
- Anhui Initiative in Quantum Information Technologies
- Department of Defense through the Hartree Postdoctoral Fellowship in the Joint Center for Quantum Information and Computer Science (QuICS)
This study demonstrates robust self-testing for multiphoton genuinely entangled quantum states, certifying four-photon entanglement in Greenberger-Horne-Zeilinger states and linear cluster states with fidelities of 0.957 and 0.945, respectively. By observing input-output statistics, the qualities of these entangled states with respect to realistic noise were estimated in a device-independent manner.
Quantum self-testing is a device-independent way to certify quantum states and measurements using only the input-output statistics, with minimal assumptions about the quantum devices. Because of the high demand on tolerable noise, however, experimental self-testing was limited to two-photon systems. Here, we demonstrate the first robust self-testing for multiphoton genuinely entangled quantum states. We prepare two examples of four-photon graph states, the Greenberger-Horne-Zeilinger states with a fidelity of 0.957(2) and the linear cluster states with a fidelity of 0.945(2). Based on the observed input-output statistics, we certify the genuine four-photon entanglement and further estimate their qualities with respect to realistic noise in a device-independent manner.
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