Logan Bishop-Van Horn

Logan Bishop-Van Horn

Physics PhD student @ Stanford

CV

Available as a PDF here.

Education

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:
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
  • Cornell Center for Materials Research, Cornell University, Ithaca, NY. Advisor: Dan Ralph.
  • Performed RF measurements and micromagnetic modeling of magnetic heterostructures for spintronics.
  • Deliverables from this period:
    • Exploring Low-Frequency ST-FMR: Simulation and Experiment [report, slides]
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

  1. 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).

Talks

Teaching