Guanhao Huang

Biographie

During my bachelor’s study, I worked in Kim Kihwan’s trapped ion quantum computing group at the Insitutue for Interdisciplinary Information Sciences of Tsinghua University, China. I primarily worked on cryogenic helical RF resonators, and realizing beam splitter gates for boson sampling using ions’ motional states. Here at LPQM, I am currently working on the generation of non-classical quantum states in macroscopic systems through optomechanical interactions at room temperature, and also chip-based nanophotonic applications.

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https://people.epfl.ch/guanhao.huang?lang=fr

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Les cristaux photoniques sont des structures périodiques de matériaux diélectriques, semi-conducteurs ou métallo-diélectriques modifiant la propagation des ondes électromagnétiques de la même manière

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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

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Lithium-Niobate-Based Frequency-Agile Integrated Lasers

Mikhail Churaev, Guanhao Huang, Tobias Kippenberg, Grigorii Likhachev, Junqiu Liu, Anat Siddharth, Viacheslav Snigirev, Rui Ning Wang

We demonstrate narrow- linewidth ultrafast tunable integrated lasers based on heterogeneously integrated thin-film lithium niobate on ultra-low loss silicon nitride integrated photonic circuits. Using self-injection locking of a hybrid microresonator, we achieve a tuning speed of > 10 peta-Hertz-per-second. We also perform FMCW LiDAR ranging experiments. (C) 2022 The Author(s)

IEEE2022

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Systems with low mechanical dissipation are extensively used in precision measurements such as gravitational wave detection, atomic force microscopy, and quantum control of mechanical oscillators via optomechanics and electromechanics. The mechanical quality factor (Q) of these systems determines the thermomechanical force noise and the thermal decoherence rate of mechanical quantum states. While the dissipation rate is typically set by the bulk acoustic properties of the material, by exploiting dissipation dilution, mechanical Q can be engineered through geometry and increased by many orders of magnitude Recently, soft clamping in combination with strain engineering has enabled room temperature quality factors approaching 10(9) in millimeter-scale resonators. Here we demonstrate a new approach to soft clamping which exploits vibrations in the perimeter of polygon-shaped resonators tethered at their vertices. In contrast to previous approaches, which rely on cascaded elements to achieve soft clamping, perimeter modes are soft clamped due to symmetry and the boundary conditions at the polygon vertices. Perimeter modes reach Q's of 3.6 x 10(9)-a record at room temperature-while spanning only two acoustic wavelengths. We demonstrate thermal-noise-limited force sensitivity of 1.3 aN/root Hz for a 226 kHz perimeter mode with quality factor of 1.5 x 10(9) at room temperature. The small size of our devices makes them well suited for near-field integration with microcavities for quantum optomechanical experiments. Moreover, their compactness allows the realization of phononic lattices. We demonstrate a one-dimensional Su-Schrieffer-Heeger chain of high-Q perimeter modes coupled via nearest-neighbour interaction and characterize the localized edge modes.

AMER PHYSICAL SOC2022

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