WealthPilot
A personal wealth and finance tracking product.
Stage 00 Closed instrument · 300 K
Rahul Nainala
Full-Stack Engineer
I work at Quantum AI Global on interfaces, services, GPU servers and edge devices.
A dilution refrigerator is how superconducting quantum computers get cold enough to work. I don't build them — I borrowed their shape to show how I build software.
|ψ⟩ = ½ (|interface⟩ + |services⟩ + |GPU server⟩ + |edge device⟩ )
Scene: A tall metal can hangs from an open steel frame in a dark workshop. Its outer shells slide apart to reveal a stack of gold and copper plates inside.
Stage 01 Top flange · ~295 K
Everything Starts Warm
Everything starts warm and noisy. Interfaces
At the top of a dilution refrigerator, everything is at room temperature: every cable, every connector, all the heat and noise of the outside world.
Interfaces are where people touch the system — the warmest, noisiest layer, and the one everyone sees.
Scene: The top flange seen from above: rows of connectors where the cables enter, the pulse-tube cooler's motor head, and copper braids draping down to the plates below.
Stage 02 50K flange · ~35–40 K
First Shield
The first shield. Services and APIs
In a real fridge this plate blocks most of the outside heat and runs a cold trap that removes contamination before it can reach anything colder.
In my work, that's the services layer: validation, auth and the gateways that keep noise out.
Scene: The camera drops through a bore in the first copper plate. Bundles of thin cables pass straight down through it, bending sideways just below the plate.
Stage 03 4K flange · ~2.85–3 K
The Workhorse
The workhorse. GPU servers
This plate takes the first heavy attenuation on the drive lines and hosts the first amplifier on the way back out.
In my work, it's the GPU servers: the heavy lifting no one sees.
Scene: A satin-gold plate carrying a row of small amplifier boxes and the first attenuators clamped onto the cables.
Stage 04 Still · ~0.88 K
Separation
Separation. Edge devices
The still distils helium-3 out of the helium mixture so it can be pumped round and sent back down again.
At the edge, my job is separating signal from a fleet of devices.
Scene: Below the still plate hangs a silver pot, and beneath it a coiled heat exchanger runs down towards the colder plates.
Stage 05 Cold plate · ~82–100 mK
The Model of the World
The model of the world. Digital twin
One step removed from the coldest point, the cold plate is quiet and precise. A digital twin is the same idea in software: a careful model of a real thing, close enough to trust.
The readout below comes from a simulated sensor feed — the same kind of stream Rubus renders onto its 3D models.
Rubus — 3D Asset Dashboard. A Three.js dashboard that renders physical equipment in 3D and overlays live IoT sensor data on the model as it streams in.
“A digital twin is a virtual representation of a physical object or system that uses real-time data to accurately reflect its real-world counterpart's behavior.”
— IBM
- Temperature
- –°C
- Vibration
- –g
- Current
- –A
- Compute load
- –%
Scene: Side-on, just below a mirror-gold plate: dense rows of attenuators hang from it, one or two on every drive line.
Stage 06 Mixing chamber · ~6–10 mK
Base Temperature
Base temperature. Personal projects
The mixing chamber is the coldest, quietest point in the machine. Down here is the work I do for myself.
P-01Product · Finance P-02Product · Fitness GymTracker
A workout logging and progress tracking app.
P-03WebGL · Narrative The Instrument (opens in a new tab)
This site: a procedural dilution refrigerator, a scroll-linked camera and a GPU particle field, all rendered in the browser.
Scene: The lowest plate, mirror gold, with small circulator blocks and the mixing chamber on top and a nested shield can hanging beneath it.
Stage 07 Qubit chip
Into the Package
Into the package. Under the hood
Inside the package, the scale drops from metres to millimetres. Real chips are about 5–20 mm across: a silicon die, aluminium wiring, a lattice of qubits and the wire bonds that connect it to the package.
This page is built the same way, layer by layer. Everything you've seen so far is procedural geometry and shaders, rendered live in your browser.
This page, under the hood
- Next.js static export
- React Three Fiber · WebGL2
- Procedural geometry · instancing
- GPGPU particles · GPUComputationRenderer
- Custom GLSL
- Lenis + GSAP ScrollTrigger
- Web Audio
Scene: Millimetre scale: a dark silicon die wire-bonded into a copper package, its surface patterned with a 45-degree square lattice of qubit pads and meandering resonators. One point glows at the centre.
Stage 08 Inside the chip
Still Alive
Still alive. Superposition
The four layers recombine into one engineer — a state that's all of them at once until you look.
Below is one qubit on a Bloch sphere. Apply a gate and the state vector turns; measure it and it collapses to a pole with probability cos²(θ/2). A playful nod to measurement, not a simulation of a real device.
|ψ⟩ = ½ (|interface⟩ + |services⟩ + |GPU server⟩ + |edge device⟩ )
|ψ⟩ = 0.924|0⟩ + 0.383|1⟩
- θ
- 45°
- φ
- 0°
- P(0)
- 85.4%
- P(1)
- 14.6%
Scene: The glowing point blooms into a cloud of particles shaped like a hydrogen orbital, then into a Bloch sphere whose arrow follows the qubit controls on the page.
Stage 09 Back to room temperature · 300 K
Readout
Amplified, not attenuated. Contact
On the way down, every signal is attenuated. On the way back up, the faint readout is amplified at each stage until it reaches room temperature.
Scene: The camera rises back up the length of the instrument to the top flange.