CV of Zhaohua Tian

Work

202303-Now: Post Doc. in Peking University.

2022.08-2022.12: Optical engineer, 2021 Lab of HIKVISION

Education

2017.09-2022.06:

PhD, Optics, Huazhong University of Science and Technology (HUST), Supervisor: Xue-wen Chen

2013.09-2017.06:

BS, Physics, Huazhong University of Science and Technology (HUST), Supervisor: Zehuang Lu

Research Interest

My research interest lies in studying the single and two-photon transport dynamics in hybrid integrated quantum nanophotonic system via the Waveguide/Cavity-QED theory. I also do theoretical modeling and numerical simulations for two experiment platform in our quantum nanophotonics laboratory. Therefore, my theoretical work will have a lot of experimental considerations. The main projects I participated in and achievements are:

Perfect quantum state transfer [1]

By studying the single photon transport dynamics, we devise a type of hybrid quantum node consisting of a single solid-state quantum system and a coupled-cavity structure toward achieving perfect state transfer between two distant nodes connected via waveguides. The hybrid node possesses flexibility in tailoring the temporal profile of the emitted singlephoton wave packet without any dynamic modulation. In particular, we show it could emit time-reversal symmetric single-photon wave packets and fully couple the emission to the waveguide, fulfilling the conditions for perfect quantum state transfer.

Single-photon and two-photon quantum gates [3]

Study and develop the wavefunction approach for handling single and two-photon transport in complex integrated nanophotonic systems. Develop the corresponding Mathematica program to allow symbolic derivations and numerical simulations automatically. By using this program, we give a systematic study on various physical mechanism such as the evolution of the quantum system, the entanglement generations and the distortion of temporal pulse shape for different kind of incident pulse shape. We finally propose a new kind of optical controlled phase gate which can achieve deterministic controlled π phase operation with high fidelity and passively.

On-chip hybrid quantum integrated photonic circuits

In our lab, we build an organic-inorganic hybrid integrated quantum photonic platform. I mainly focus on the design of photonic devices to achieve high coupling efficiency of DBT molecular to the planar integrated optical circuits [4], and I’m also responsible for the design of some passive components such as multimode interferometer, grating couplers etc. My achievements are：(1) A semi-analytic method based on dipole-micro ring waveguide coupling to calculate dipole-micro ring resonator coupling is developed, which requires less time and memory, and is more suitable for device optimization.（2）Did a systematic study on high coupling efficiency single photon source design via plasmonic/dielectric/photonic crystal waveguide/cavities and summarized the basic design steps; (3) Chiral coupling design between quantum emitter (linear dipole) and waveguides/cavities by using two specially designed gold nano beams to generate equivalent circular dipole emission.

Scanning exciton microscopy

The ability to map light field and local density of optical states (LDOS) with nanometer spatial resolution underpins important research fields as diverse as nanophotonics, quantum optics, advanced spectroscopy and material science. We experimentally realized an ultra photostable and sensitive scanning probe based on a single oriented colloidal quantum dot (QD) and perform scanning exciton microcopy [5]. My achievements are（1）Develop the method for fitting the dipole structure and orientation of quantum dots based on far-field images, and carried out statistical measurements on more than 120 quantum dots to obtain the general dipole structure properties of colloidal quantum dots [5].（2）A new method based on the Purcell effect was proposed to characterize and measure the 3D dipole structure and orientation of colloidal quantum dots, and the CdSe/ZnS quantum dots were measured experimentally, and a finer 3D structure was obtained [2].（3）Modeling and numerically simulated the scanning process of quantum dot under tip including the far field imaging of quantum emitter, near-field scattering of the nano particle on substrate and emission property of quantum emitter under complex environment [5].

Research Skill

Programming: MATLAB, Mathematica, Python, Fortran, Julia

Simulation software/program: COMSOL Multiphysics (FEM), Lumerical FDTD Solutions (FDTD), MEEP (FDTD, open source), S4 (RCWA, open source), Qutip (open source).

Self-coded numerical modeling projects:

(1) Far-field emission pattern of dipole in multi-layer structures (github repository: MATLAB Version and Python Version)

(2) FDFD method for waveguide mode analysis (github repository: Waveguide Mode Analysis ).

(3) Mathematica package for single/two-photon transport dynamics (github repository to be created after the publication of ref. [3]).

(4) RCWA methods for simulating periodic structures (github repository: RCWA-MATLAB).

(5) Scalar diffraction theory (github repository: Scalar Diffractions ).

(6) Transfer matrix method for plane wave transmission and reflection (github repository: Transfer Matrix)

Conference

2017-09: Poster presentation: Guided surface-volume plasmon modes and perfectly matched layers for ultrathin nonlocal media under hydrodynamics-Drude description. International Symposium “20 Years Nano Optics”. Max Planck Institute for the Science of Light (MPL), Erlangen, Germany.

2018-10: Poster presentation: Static Hybrid Quantum Nodes: Toward Perfect State Transfer on a Photonic Chip. “2018 International Symposium on Quantum Technologies”. China East Normal University, Shanghai, China.

2021-06: “2nd workshop on waveguide QED”, online

Teaching experience:

2016-2018 Teaching assistant: Electromagnetism, Huazhong University of Science and Technology

Honor and awards

2013 HUST Self-improvement scholarship of freshman

2015 HUST Outstanding student leaders in school of physics

2017 HUST Outstanding graduates

2017 MPL Travel stipend (1500 euros) for the international symposium “20 Years Nano Optics”

2021 HUST The Third Prize of the Academic Annual Conference of the School of Physics

Publications

: These authors contributed equally

*: Corresponding author

[1]. Zhaohua Tian, Pu Zhang*, and Xue-Wen Chen*. Static Hybrid Quantum Nodes: Toward Perfect State Transfer on a Photonic Chip. Physical Review Applied, 2021, 15(5): 054043.

[2]. Zhaohua Tian, Zhiyuan Wang, Tianzi Ma, Jianwei Tang*, and Xue-Wen Chen*. Quantum dipole characterization and measurement by mapping a plasmon-tailored nanophotonic environment. (In preparation);

[3]. Zhaohua Tian and Xue-Wen Chen*. Passive Photonic Phase Gate via a Two-Level Emitter and Few Cavities. arXiv:2312.10719

[4]. Penglong Ren , Shangming Wei , Weixi Liu, Shupei Lin, Zhaohua Tian, Tailin Huang, Jianwei Tang*, Yaocheng Shi*, and Xue-Wen Chen*. Photonic-circuited resonance fluorescence of single molecules with an ultrastable lifetime-limited transition. Nat. Commun. 13, 3982 (2022).

[5]. Zhiyuan Wang , Jianwei Tang , Xiaoqi Hou , Weiwang Xu , Zhaohua Tian, Jiahao Han, Haiyan Qin*, and Xue-Wen Chen*. Scanning exciton microscopy using a single oriented colloidal quantum dot. (Nat. Commun. In revision)

[6]. Miaomiao Xu, Tingting Zhai, Zhaohua Tian, Xue-Wen Chen, Rafael Salas-Montiel*. Unidirectional efficient hybrid coupler for an integrated single-photon source. JOSA B, 39, (2022)

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