Zheru Qiu

Biography

Before joining LPQM, I graduated from University of Science and Technology of China with a bachelor's degree. In USTC, I actively worked in Prof. Zheng-tian Lu's research group and I mainly participated in the atomic magnetometer project led by Prof. Dong Sheng.

Official source

https://people.epfl.ch/zheru.qiu

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A photonic integrated circuit-based erbium-doped amplifier

Jijun He, Xinru Ji, Tobias Kippenberg, Junqiu Liu, Yang Liu, Anton Lukashchuk, Zheru Qiu, Rui Ning Wang

Erbium-doped fiber amplifiers revolutionized long-haul optical communications and laser technology. Erbium ions could provide a basis for efficient optical amplification in photonic integrated circuits but their use remains impractical as a result of insufficient output power. We demonstrate a photonic integrated circuit-based erbium amplifier reaching 145 milliwatts of output power and more than 30 decibels of smallsignal gain-on par with commercial fiber amplifiers and surpassing state-of-the-art III-V heterogeneously integrated semiconductor amplifiers. We apply ion implantation to ultralow-loss silicon nitride (Si3N4) photonic integrated circuits, which are able to increase the soliton microcomb output power by 100 times, achieving power requirements for low-noise photonic microwave generation and wavelength-division multiplexing optical communications. Endowing Si3N4 photonic integrated circuits with gain enables the miniaturization of various fiber-based devices such as high-pulse-energy femtosecond mode-locked lasers.

AMER ASSOC ADVANCEMENT SCIENCE2022

A Photonic Integrated Circuit-Based Erbium-doped Waveguide Amplifier

Jijun He, Xinru Ji, Tobias Kippenberg, Junqiu Liu, Yang Liu, Zheru Qiu, Rui Ning Wang

We demonstrate an erbium-doped waveguide amplifier by erbium ion implantation in Si3N4 photonic integrated circuits, achieving 145 mW on-chip output power and more than 30 dB small-signal gain, which is on par with commercial fiber amplifiers and beyond state-of-the-art III-V heterogeneously integrated semiconductor amplifiers. (C) 2022 The Author(s)

IEEE2022

Cavity-mediated electron-photon pairs

Guanhao Huang, Tobias Kippenberg, Junqiu Liu, Zheru Qiu, Arslan Sajid Raja, Rui Ning Wang, Yujia Yang

Quantum information, communication, and sensing rely on the generation and control of quantum correlations in complementary degrees of freedom. Free electrons coupled to photonics promise novel hybrid quantum technologies, although single-particle correlations and entanglement have yet to be shown. In this work, we demonstrate the preparation of electron-photon pair states using the phase-matched interaction of free electrons with the evanescent vacuum field of a photonic chip-based optical microresonator. Spontaneous inelastic scattering produces intracavity photons coincident with energy-shifted electrons, which we employ for noise-suppressed optical mode imaging. This parametric pair-state preparation will underpin the future development of free-electron quantum optics, providing a route to quantum-enhanced imaging, electron-photon entanglement, and heralded single-electron and Fock-state photon sources.

AMER ASSOC ADVANCEMENT SCIENCE2022