Monium
Superconducting qubit lab
Only for iPhone
$3.99
iPhone
Interactive superconducting-qubit physics in your pocket: sweep parameters and watch spectra, wavefunctions, matrix elements, and coherence times update live.
Monium puts superconducting-qubit physics in your pocket — a mobile companion to the open-source scqubits library, built for researchers, students, and the quantum-curious.
Pick a qubit, tune its parameters with live sliders, and watch the physics update in real time:
• Energy spectrum vs. any swept parameter
• Wavefunctions over the potential (and in the charge basis)
• Matrix elements as a heatmap, and vs. the swept parameter
• T1 / T2 coherence times per noise channel
• Exact computed values behind every plot, as tables
Supported qubits: Transmon, Tunable Transmon (SQUID), and Fluxonium.
Built for real work:
• Enter the Josephson energy the way you measure it — critical current, junction inductance, or room-temperature normal-state resistance (with a cryo/room ratio).
• Save and reload presets per qubit.
• Convergence indicators so you can trust the numbers.
Everything runs on-device. No account, no ads, no tracking, no network — your work stays on your phone.
Monium mirrors scqubits' conventions, and its results are tested against it: energy spectra, matrix elements and coherence times for all three qubits are checked against the Python library's own output.
Fixes a numerical bug in the Fluxonium solver. At grid resolutions above the
default (80 points), the eigensolver could omit a near-degenerate energy level
and still mark the result as converged. Affected levels were most often found at
low inductive energy with high charging energy. The solver now computes the full
spectrum at every grid resolution, and the result is checked level by level
against a reference calculation. Spectra at the default resolution were not
affected.
The developer, Jens Koch, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jens Koch
- Size
- 38.6 MB
- Category
- Education
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Jens Koch
