PHY 341

Welcome to PHY 341 – Quantum Mechanics I homepage

We will use this space to post extra course materials, like homework, solutions, announcements, etc.

If you have any interesting and related links, we can add them too.

  • Announcements
    • AAPT SM24 talk
    • Pre and post survey questions
    • Classroom ChatGPT spin sessions
    • ChatGPT sessions accompanying Am. J. Phys. 91, 255–256 (2023)
  • Codes and other links
    The programs are in the Jupyter notebook format. You can download it and open it with Jupyter. If you do not have access to a Jupyter installation or server, you can go to on the cloud, and upload the notebook there.
    Note: Due to some weird, nonsensical rule of the site disallowing the “.ipynb” file extension, I have the programs in .zip (or plain .txt) formats. If you download a zip file, unzip it to recover the .ipynb file. If you download the .txt file (right click then save), just rename “somefile-ipynb.txt” to “somefile.ipynb”.

    • Local Jupyter/Python server. For the first time, make sure to login using UMD credentials via ssh ( eg putty on Windows) with putty Simply exit after login. This will create a proper directory structure. Subsequently, you can login by clicking on the link.
    • (if you have nothing better)
    • Motion of a quantum oscillator: You may run or edit this program in your web browser from (a) homepage here (scroll to bottom); or (b) Glowscript version; or (c) Program_8.2_sdlf.ipynb. Download and save the named program, making sure to extract all including the associated library files,, in one place. Upload the files to your Jupyter notebook.
    • Simulation of averages by ramdom sampling in free fall in zip format.
    • Superposition of states in zip format. HW 2a refers to this program.
    • Exploration of discreteness of states in zip format.
    • Expansion/integrals with Sympy in zip format.
    • SHO with sympy in zip format.
    • SHO classically forbidden zones in zip format.
    • SHO allowed energies in zip format.
    • Momentum wf of a square in zip format.
    • Momentum wf of a Gaussian in zip format.
    • Square well: unbound states in zip format.
    • Square well: allowed energies and wave functions in zip format.
    • Square well: visualizing bound states in zip format.
    • Momentum wf (Gaussian) with sympy in zip format.
    • Finding eigenstates of matrices algebraically with sympy in zip format.
    • Basis transformation and qubits with sympy in zip format.