Bosonuum
III — oil on linen, 185 × 274 cm, 2026, by Elizabeth R. S. Burnim

Bosonuum LLC · Design and verification for superconducting hardware · Bozeman, Montana

The physics of a superconducting device, computed before it is built.

Checked at every step. On the record.

Start a projectThe record ↓
III · Oil on linen, 185 × 274 cm, 2026

What Bosonuum does

Bosonuum computes the quasiclassical physics of superconducting devices — Josephson junctions, proximity structures, and the spin-active fields that make them nonreciprocal — with a GPU solver in which every term is separately gated and every result is adjudicated against a protocol registered before the run.

For a team building superconducting hardware, what exists today is a verified design tool for junction and proximity physics, and a design partnership on the first component.

What the solver does not yet do is written down beside what it does. Read about the solver →

841commits, each attributed
46gates that print a verdict
62sources read and paged
9,717lines of solver

The name

Boson and continuum. A Cooper pair is a boson; a superconductor is a condensate of them; the quasiclassical theory describes that condensate as a continuum, and the solver computes it. The name says what the company does: it computes the bosonic state of a device before the device is built, and it puts every step on the record.

The model

Today — verification. The physics of a device computed and gated before it is built; a design partnership on the first component.

Next — design to specification. A component specified from the physics, with the record that shows why it should work.

Then — manufacture to specification with foundry partners. Bosonuum designs and verifies; a superconducting foundry fabricates; the measurement closes the loop against the record.

II — oil on linen, 185 × 274 cm, 2026, by Elizabeth R. S. Burnim

The readout chain

Every readout line still carries ferrite isolators between the qubit and its amplifier.

A nonreciprocal element that comes from the junction’s own physics rather than from a ferrite is the component family under study — the superconducting diode effect, computed from spin-active fields in the quasiclassical theory.

II · Oil on linen, 185 × 274 cm, 2026

The record

What has been shown, dated.

Each entry is dated by the record that holds it and is held by a gate that prints it or a run record that names it. The open findings are listed with the rest, because they are part of the record too.

  1. Transport solved on GPU at production resolution. The two device gates print their first pass on hardware; the 1200-element run converges.
    Pass
  2. Agreement with an independent integrator. A four-rung mesh ladder against an adaptive Runge–Kutta reference: relative L2 disagreement at or below 6.5 × 10−9.
    Pass
  3. Second-order convergence, pre-registered. Under a protocol registered before the run, the measured order of the transport solve is p = 2.00, forty checks.
    Pass
  4. Reflecting walls, on device. The specular boundary condition passes 226 checks on hardware after 218 across nine configurations on host; walled runs converge in the same iteration counts as unwalled ones.
    Pass
  5. The unit-disk excess. Along wall-normal trajectories the computed amplitude leaves its physical bound at the nodes where the pairing steps — present in every inhomogeneous run, its size tracking the element aspect ratio. Contained on 2026-09-18 (a run that crosses the bound now fails loudly); its mechanism not established.
    Open
  6. Equilibrium current, conserved. The current observable is gated at twenty named checks: the closed form at roundoff, conservation to better than 5 × 10−3 on converged transport at two resolutions.
    Pass
  7. Free energy confirmed on hardware. Both device gates for the free-energy functional pass; the current-reduction kernel is exact on device at 1.7 × 10−15.
    Pass
  8. One device gate has never passed. Its single hardware run failed with non-finite fields at near-grazing angles of a complex twisted state; the host reproduces none of it; the device confirmation is unrun.
    Open
  9. Continuous verification. A fresh-clone battery — every check, every host gate — now runs on every push.
    Pass
  10. A magnetic field enters the transport and the gap equation. The Zeeman term lands on both passes of the transport operator and in the self-consistency, gated at twenty-nine named checks with three planted controls — the sign, the dropped imaginary unit, the old sweep. The gate found what it was built to find: the sweep had read one component of four, exact only at zero field.
    Pass
  11. The reservoir under a field. The far-field pairing is resolved at its in-field root once at start-up and stamped in every artifact; the gate grows to thirty-three checks with a fourth control.
    Pass
  12. Every converged state is checked against its physical bound. A guard on the unit disk runs on every converged run and refuses the reductions when a state crosses it; three planted excesses were found at their places, and the known window state was caught — 128 of 614,400 entries above the bound.
    Pass

Verification first

Every term of the discretization is gated separately; every number in the record regenerates from a clean checkout; a commit that turns the battery red cannot land. The solver was built with AI-assisted development under that discipline — every change gated, every commit attributed to the model that made it, every result adjudicated against a protocol registered before the run.

Direction

The readout chain of a superconducting quantum processor still depends on discrete ferrite isolators and circulators on every line. Before anything is built, the work is customer discovery with the teams that scale these systems — what they cannot buy, what its absence costs, and who would fabricate a first device — while the solver computes the physics that a nonreciprocal element would rest on.

Contact

Three doors, each with the questions we will ask.

Each opens the form with its questions in place.

Start a projectYou scale readout lines. Thirty minutes on what you cannot buy today.Open the form → You invest in quantum hardwareStage, thesis, what you would want to see first.Open the form → You work on the physicsA problem the solver should do.Open the form →
elizabeth@bosonuum.com

Bozeman, Montana