Ph.D in physics, specialized in superconducting qubits and cQED

Andy Zhenghao Ding

PHD CANDIDATE · PHYSICS

** ******** ******, ********** ** Applied Physics, Yale University, New Haven, CT 06520

+1-309-***-**** ********.****@****.***

Education

Yale University New Haven, CT, USA

PH.D IN PHYSICS Jul 2019 - present

• Advisor: Prof. Michel Devoret

• Thesis topic: Towards fault-tolerant quantum computing with Gottesman-Kitaev-Preskill states University of Waterloo Waterloo, ON, Canada

MSC. IN PHYSICS (QUANTUM INFORMATION) Sept 2017 - May 2019

• Advisor: Prof. Michal Bajcsy

• Thesis: Superradiance and its implementation in cold atoms inside a hollow-core waveguide Illinois Wesleyan University Bloomington, IL, USA

BSC. IN PHYSICS, MINOR IN COMPUTER SCIENCE Aug 2014 - May 2017

• Advisor: Prof. Gabriel C. Spalding

• Honor’s Thesis: Studies in mesoscopics and quantum microscopies Publications

A. Z. Ding*, B. L. Brock*, A. Eickbusch, A. Koottandavida, N. E. Frattini, R. G. Cortiñas, V. R. Joshi, S. deGraaf,B. J. Chapman, S. Ganjam, V. V. Sivak, L. Frunzio, R. J. Schoelkopf and M. H. Devoret, “Quantum Control of an Oscillator with a Kerr-cat Qubit,” arXiv:2407.10940v1 [quant-ph], Under Review at Nature Communications. A. Eickbusch, V. Sivak, A. Z. Ding, S. S. Elder, S. R. Jha, J. Venkatraman, B. Royer, S. M. Girvin, R. J. Schoelkopf and M. H. Devoret, “Fast universal control of an oscillator with weak dispersive coupling to a qubit,” Nat. Phys., 18, 1464-1469, (2021) B. L.Brock,S. Singh, A. Eickbusch, V. V. Sivak,A.Z.Ding, L. Frunzio, S.M.Girvin,andM.H.Devoret, ”Quantumerrorcorrection of qudits beyond break-even,” arXiv:2409.15065 [quant-ph], Under Review at Nature V. V. Sivak, A. Eickbusch, B. Royer, S. Singh, I. Tsioutsios, S. Ganjam, A. Miano, B. L. Brock, A. Z. Ding, L. Frunzio, S. M. Girvin, R. J. Schoelkopf and M. H. Devoret, ”Real-time quantum error correction beyond break-even,” Nature, 616, 50-55, (2023) V. R. Joshi, A. Koottandavida, A. Miano, A. Z. Ding, C. S. Wang, B. J. Chapman, R. G. Cortiñas, L. Frunzio and M. H. Devoret,

“Zeno slow-down of a photon decaying from a microwave cavity through engineered dissipation,” (In preparation) T. Yoon, Z. Ding et al. ”Monitoring Raman emission through state population in cold atoms confined inside a hollow-core fiber,” Opt. Express, 27, 175**-***** (2019)

Research Experience

Yale University - Dept. of Physics New Haven, CT

ADVISOR: PROF. MICHEL DEVORET Jul. 2019 - Present

• Designed and fabricated an architecture for coupling a high-Q cavity (realized in a 3-D aluminum package) to a Kerr-cat qubit

(realized in an on-chip tantalum-based SNAIL circuit).

• Demonstrated universal control of a high-Q microwave cavity with a Kerr-cat qubit using this architecture; working towards fault-tolerant quantum error correction of a GKP qubit using the Kerr-cat as an ancilla.

• Characterized microwave losses in tantalum thin-films with tripole striplines for different fabrication recipes.

• Fabricated tantalum-based transmons with quality factors exceeding 11 million

• Designed and fabricated on-chip Coplanar Waveguide (CPW) devices (including Xmons) for investigating losses in transmon devices due to Two-Level Systems (TLS), in collaboration with Dr. Jürgen Lisenfeld of Karlsruhe Institute of Technology.

• Fabricated a novel, fully-optimized niobium-based SNAIL Parametric Amplifier (SPA) on silicon.

• Designed and fabricated an architecture for implementing a logical CNOT gate between two stabilized GKP states.

• Developed and programmed RobustGrape - a python package that uses Gradient-AscentPulseEngineering(GRAPE) and filter function method to optimize for control pulses that are robust against hardware-level noise. JAN 2024 A. Z. DING · CURRICULUM VITAE 1

Reviewer for Physical Review Letters, Physical Review X and Physical Review Applied Sept. 2023 - Present

University of Waterloo - Dept. of Physics, Institute for Quantum Computing Waterloo, ON ADVISOR: PROF. MICHAL BAJCSY June 2017 - May 2019

• Investigated coherent many body interactions inside a Hollow-core Photonic Crystal Fiber (HCPCF) and understand different matter-field coupling regimes. Developed a new detection scheme for Raman scheme superradiance in a hollow-core fiber

• Designed and set up the optics for characterizing the circular dichroism of the fabricated photonic crystalmembrane

• Experimentally realizedelectromagnetically-induced transparency inCscoldatomensemblesinhollow-corephotoniccrystal fiber to study slow light and phase modulation with cold atoms. University of Vienna - Dept. of Physics - Internship Vienna, Austria SUPERVISORS: PROF. NIKOLAI KIESEL, PROF. MARKUS ASPELMEYER Summer 2018

• Observedandquantifiedhiddenentropyproductionof nano-scale engines using optically-levitated particle system

• Implemented an integrated HCPCF optical trap to build a particle deliverymechanismfor cavity optomechanics.

• Implemented an aspherical lens optical tweezers for nanoparticles Illinois Wesleyan University - Dept. of Physics and Astronomy Bloomington, IL ADVISOR: PROF. GABRIEL C. SPALDING 2014-2017

• Developed a method for encoding and decoding digital information in the orbital angular momentum of the Laguerre- Gaussian mode of a laser beam, using Fourier optics and transformation optics, in collaboration with Dr. Martin Lavery and Prof. Miles Padgett of the University of Glasgow.

• Developed educational modules for use in Illinois Wesleyan University’s instructional lab, in collaboration with Prof. Paul Kwiat fromUniversityofIllinois,Urbana-Champaign. The curriculumwasputforwardinPHYS370MomentumofthePhotons in 2017 and is under review of become a standard part of the physics curriculum in IWU. Harvard University - Dept. of Physics - Internship Cambridge, MA SUPERVISOR: PROF. DAVID WEITZ Summer 2016

• Developed micron scale droplet and hydrogel generation technology based on PDMS microfluidic system, and applied the platform on the immuno assay at the single cell level, in which we encapsulate two different cell types into generated micro- compartments for observing immune response at the single cell level.

• Designed, and fabricatedmicrofluidicdevicesusedintheimmunolassay,including co-flow droplet-generating devices, pico- injection devices, devices with reservoirs for droplets, and multilayer devices.

• Design and fabricate micro-valves for controlling flows in the microfluidic channels. Skills

JAN 2024 A. Z. DING · CURRICULUM VITAE 2

Nanofabrication

• Josephson junction fabrication, including bridge-free and Dolan bridge designs, for transmon, SQUID and SNAIL circuits with different junction transparencies.

• Optical lithography for superconducting circuit fabrication; developed the standard operating pro- cedure for optical lithography with the Heidelberg Maskless Aligner 150.

• Electron-beam (E-beam) lithography, including the Raith EBPG 5000+ and EBPG 5200+ systems.

• Thin-filmdeposition,includingE-beamevaporation,sputtering, and thermal evaporation. Currently in charge of maintaining the Plassys E-beam evaporation tool for Qlab.

• Surface and film metrology, including scanning electron microscopy, contact profilometry, non- contact reflectometry, and ellipsometry

• Plasma etching of tantalum and niobium film on sapphire and silicon substrates.

• Substrate cleaning and processing, including piranha cleaning, substrate annealing and plasma cleaning.

• Chip dicing, including sapphire and silicon substrates

• Microfluidics device, design and fabrication

Simulation

• Programming: Python, LabVIEW, Matlab, QuTiP

• Superconducting quantum circuit and device design: HFSS, Qiskit Metal, and pyEPR for both planar and 3D designs.

Quantum

measurement

• Roomtemperatureradio-frequency (RF) electronicscomponentsforquantumcontrolandmeasure- ments.

• Feedback FPGA-based RF electronics for quantum error correction. Cryogenic system

• Operation and maintenance of dilution refrigerators. In charge of maintaining the fridge hosting my projects.

• Design, installation, and calibration of cryogenicRF circuitry Presentations

INVITED

2023 Towards fault-tolerant stabilization of a GKP qubit using a Kerr-cat auxiliary qubit. Oral presentation: C2QA Qubit Co- herence Meeting, Princeton University, Princeton, NJ. 2018SuperradiancewithcoldCsatomsinsideahollow-corephotoniccrystalfiber.Invitedtalk,Institutefortheoreticalphysics, University of Innsbruck, Innsbruck, Austria

CONTRIBUTED

2024 Quantum Control of an Oscillator with a Kerr-cat Qubit. Poster presentation: NSF Workshop on Quantum Operating Systems and Real-Time Control, Austin, TX.

2024 Towards fault-tolerant stabilization of a GKP qubit using a Kerr-cat ancilla. Oral presentation: APS March Meeting, Min- neapolis, MN.

2023 Towards fault-tolerant stabilization of a GKP qubit using a Kerr-cat auxiliary qubit. Oral presentation: APS March Meet- ing, Las Vegas, NV.

2022 Towards a logical CNOT between two stabilized GKP states. Oral presentation: APS March Meeting, Chicago, IL. 2019 Probing amplified spontaneous emission to superradiance transition in cold Cs atoms inside a hollow-core photonic- crystal fiber. Oral presentation: APS March Meeting, Boston, MA 2018Opticalmanipulationsinhollow-corefibers.Posterpresentation:2018SPIEOptics&PhotonicsConference,Nanoscience and Engineering Conference, Optical Trapping and Optical Micromanipulation XV San Diego, CA 2017 Experimental analysis of light’s angular momentum. Poster presentation: APS March Meeting Awards, Fellowships, & Grants

JAN 2024 A. Z. DING · CURRICULUM VITAE 3

2021-2022 Ke Li Fellow, Nathan Hale Associates Fellowship Program, Yale University 2018 Optics and Photonics Educational Scholarship, SPIE Society for Optics and Photonics 2017-2019 Marie Curie Award, University of Waterloo 2017-2019 International Master’s and Doctoral Student Award, University of Waterloo 2017-2019 Science Graduate Award, University of Waterloo 2017 Undergraduate Research Award, University of Waterloo 2017 Harold C. Hodge President’s Club Award in Natural Science and Mathematics, Illinois Wesleyan University 2017 Student Leadership Distinguished Service Award for Intellectual Leadership, Illinois Wesleyan University 2017 Future of Physics Outstanding Undergraduate Research Presentation Award, American Physical Society 2017 Member, Phi Kappa Phi

2015 Optics and Photonics Educational Scholarship, SPIE Society for Optics and Photonics Technology 2015 Student Chapter Officer Travel Grant, SPIE Society for Optics and Photonics Teaching Experience

Dept. of Physics, Yale University New Haven, CT, USA GRADUATE TEACHING ASSISTANT 2019 - present

• CHEM S136 General Chemistry Laboratory II, Summer 2022

• PHYS 261 01 (SP21): Intensive Introductory Physics, Spring 2021

• PHYS 260 01 (FA20): Intensive Introductory Physics, Fall 2020

• General Physics Laboratory, Spring 2020

• General Physics Laboratory, Fall 2019

Dept. of Physics and Astronomy, University of Waterloo Waterloo, ON, Canada GRADUATE TEACHING ASSISTANT 2017 - 2019

• Physics 232L Measurement Laboratory, Fall 2018

• Physics 360/460L Advanced Modern Physics, Spring 2018

• Physics 121/131L Mechanics, Fall 2017

Dept. of Physics and Astronomy, Illinois Wesleyan University Bloomington, IL, USA ASSISTED THE DESIGN AND THE TEACHING OF SEVERAL ADVANCED LABORATORY COURSES 2016 - 2017

• Physics 370 Momentum of the Photon lab, Spring 2017

• Physics 299 Intermediate Experimental Methods, Spring 2017

• Physics 207 Modern Physics, Fall 2016

JAN 2024 A. Z. DING · CURRICULUM VITAE 4

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