pyTDGL: Time-dependent Ginzburg-Landau in Python
Logan Bishop-Van Horn, "pyTDGL: Time-dependent Ginzburg-Landau in Python", arXiv:2302.03812 (2023).
CV
Available as a PDF here.
Education
- Ph.D in Physics, Stanford University, in progress
- M.S. in Physics, Stanford University, 2019
- B.A. in Physics & Mathematics, Clark University, 2016
Experience (Click to expand)
September 2017 - January 2019, January 2021 - present: Research Assistant, Stanford University
- Department of Physics, Stanford University, Stanford, CA. Advisor: Kam Moler.
- Developed open-source tools for London-Maxwell [superscreen.rtfd.io] and time-dependent Ginzburg-Landau (TDGL) [py-tdgl.rtfd.io] modeling of two-dimensional superconductors with arbitrary geometry.
- Constructed and optimized a cryogen-free variable temperature scanning SQUID microscope.
- Implemented digital flux feedback for SQUID readout using FPGAs.
- Publications from this period:
- pyTDGL: Time-dependent Ginzburg-Landau in Python, arXiv:2302.03812 (2023).
- Local imaging of diamagnetism in proximity-coupled niobium nanoisland arrays on gold thin films, Physical Review B (2022) (Editors’ suggestion).
- SuperScreen: An open-source package for simulating the magnetic response of two-dimensional superconducting devices, Computer Physics Communications (2022). Python package: https://superscreen.readthedocs.io/
- Cryogen-free variable temperature scanning SQUID microscope, Review of Scientific Instruments (2019).
- Imaging anisotropic vortex dynamics in FeSe, Physical Review B (2019).
January 2019 - January 2021: Research Associate, Quantum Circuits, Inc.
- Quantum Circuits, Inc. (QCI), New Haven, CT. Supervisors: Harvey Moseley, Rob Schoelkopf.
- Characterization and modeling of superconducting devices for quantum information processing using qubits encoded in microwave cavities.
- Deliverables from this period:
- SeQuencing, an open-source Python package for simulating the dynamics of open quantum systems under realistic pulse sequences.
- qascade, a (closed-source) Python package for estimating noise photon numbers at all stages of a quantum control microwave signal chain based on measured or simulated RF and thermal properties of microwave components.
Summer 2016: Undergraduate Research Assistant, Cornell University
June 2014 - December 2016: Undergraduate Research Assistant, Clark University
- Department of Physics, Clark University, Worcester, MA. Advisor: Charles Agosta.
- Measured the RF penetration depth of unconventional superconductors at high magnetic fields using tunnel diode oscillators.
Skills (Click to expand)
Low temperature and condensed matter physics
- Cryogenic scanning probe microscopy of quantum materials and devices
- Electromagnetic modeling of superconducting devices
- Operation of cryogen-free dilution refrigerators
- Instrument control and measurement automation
Quantum computing
- Automating the characterization and calibration of superconducting qubits and cavities
- Modeling dynamics of open quantum systems (QuTiP, SeQuencing)
- Dynamical decoupling noise spectroscopy
- Software and RF electronics for quantum control
Scientific programming
- Scientific Python (numpy, scipy, matplotlib, pandas, JAX, …)
- MATLAB
- Finite element methods
- Bash, Git, and GitHub
- Interfacing with HPC (Slurm, Ray, MPI)
Publications
Local imaging of diamagnetism in proximity-coupled niobium nanoisland arrays on gold thin films
Logan Bishop-Van Horn*, Irene P. Zhang*, Emily N. Waite, Ian Mondragon-Shem, Scott Jensen, Junseok Oh, Tom Lippman, Malcolm Durkin, Taylor L. Hughes, Nadya Mason, Kathryn A. Moler, and Ilya Sochnikov, "Local imaging of diamagnetism in proximity-coupled niobium nanoisland arrays on gold thin films", Phys. Rev. B 106, 054521 (2022) (Editors' Suggestion).
SuperScreen: An open-source package for simulating the magnetic response of two-dimensional superconducting devices
Logan Bishop-Van Horn and Kathryn A. Moler , "SuperScreen: An open-source package for simulating the magnetic response of two-dimensional superconducting devices", Computer Physics Communications Volume 280, November 2022, 108464.
Imaging anisotropic vortex dynamics in FeSe
Irene P. Zhang, Johanna C. Palmstrom, Hilary Noad, Logan Bishop-Van Horn, Yusuke Iguchi, Zheng Cui, Eli Mueller, John R. Kirtley, Ian R. Fisher, and Kathryn A. Moler, "Imaging anisotropic vortex dynamics in FeSe", Phys. Rev. B 100, 024514 (2019).
Cryogen-free variable temperature scanning SQUID microscope
Logan Bishop-Van Horn, Zheng Cui, John R. Kirtley, and Kathryn A. Moler , "Cryogen-free variable temperature scanning SQUID microscope", Review of Scientific Instruments 90, 063705 (2019).
The signature of inhomogeneous superconductivity
Charles C. Agosta, Logan Bishop-Van Horn, Max Newman, "The Signature of Inhomogeneous Superconductivity", Journal of Low Temperature Physics 185, 220–229 (2016).
Talks
Vortex dynamics induced by scanning SQUID susceptometry
Talk at APS March Meeting 2023, Las Vegas, Nevada
Simulating the static magnetic response of thin film superconducting devices
Talk at APS March Meeting 2022, Chicago, Illinois (presented remotely)
Designing, making, imaging, and modeling landscapes of superfluid density in two-dimensional superconductors
Talk at Energy Frontier Research Center Quantum Sensing and Quantum Materials (QSQM) Research Symposium, Virtual
Quantum sensing with superconducting qubits
Talk at Energy Frontier Research Center Quantum Sensing and Quantum Materials (QSQM) Research Symposium, Virtual
Cryogen-free variable temperature scanning SQUID microscope
Talk at APS March Meeting 2019, Boston, Massachusetts
New details in the superconducting phase diagram of λ-(BETS)2GaCl4
Talk at APS March Meeting 2017, New Orleans, Louisiana