Experimental Quantum Non-Gaussian Coincidences of Entangled Photons

Run-Ze Liu, Yu-Kun Qiao, Lukáš Lachman, Zhen-Xuan Ge, Tung-Hsun Chung, Jun-Yi Zhao, Hao Li, Lixing You, Radim Filip, and Yong-Heng Huo

Phys. Rev. Lett. 132, 083601 – Published 21 February 2024

Abstract

Quantum non-Gaussianity, a more potent and highly useful form of nonclassicality, excludes all convex mixtures of Gaussian states and Gaussian parametric processes generating them. Here, for the first time, we conclusively test quantum non-Gaussian coincidences of entangled photon pairs with the Clauser-Horne-Shimony-Holt-Bell factor $S = 2.328 \pm 0.004$ from a single quantum dot with a depth up to $0.94 \pm 0.02 dB$ . Such deterministically generated photon pairs fundamentally overcome parametric processes by reducing crucial multiphoton errors. For the quantum non-Gaussian depth of the unheralded (heralded) single-photon state, we achieve the value of $8.08 \pm 0.05 dB$ ( $19.06 \pm 0.29 dB$ ). Our Letter experimentally certifies the exclusive quantum non-Gaussianity properties highly relevant for optical sensing, communication, and computation.

Received 27 April 2023
Accepted 24 January 2024

DOI:https://doi.org/10.1103/PhysRevLett.132.083601

Physics Subject Headings (PhySH)

Non-gaussian quantum states Quantum optics with artificial atoms Semiconductor quantum optics

Quantum Information, Science & Technology

Authors & Affiliations

Run-Ze Liu ^1,2,*, Yu-Kun Qiao ^1,2,*, Lukáš Lachman^3,*, Zhen-Xuan Ge^1,2,*, Tung-Hsun Chung⁴, Jun-Yi Zhao ^1,2, Hao Li⁵, Lixing You⁵, Radim Filip^3,†, and Yong-Heng Huo ^1,2,4,‡

¹Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China
²Shanghai Research Center for Quantum Science and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
³Department of Optics, Palacký University, 17. listopadu 12, 77146 Olomouc, Czech Republic
⁴Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
⁵Shanghai Key Laboratory of Superconductor Integrated Circuit Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China

^*These authors contributed equally to this work.
^†filip@optics.upol.cz
^‡yongheng@ustc.edu.cn

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Issue

Vol. 132, Iss. 8 — 23 February 2024

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