Build it in the browser first, then in the rooms
Each lab shows the real build in 3D with every part placed where it stands and paid for by a line of the bill of materials, the parameters that matter as sliders, and a terminal that prints the exact math, line by line, from the same formulas the Python test suite checks. Every lab climbs from a starter you can build this month to the real-world option.
The two-room link
Starter bright-light analogue ($40–120) → single photons between two rooms ($530–1,180) → avalanche-diode upgrade → entangled photons. Weak 405 nm pulses, decoys, four SiPMs, FPGA gating, and a fiber classical channel, with the twin's prediction for every knob.
NEW · QUANTUM CHANNELSThe hallway as a quantum channel
What the trip between the rooms does to a qubit, drawn as the sphere of polarizations turning into an ellipsoid; a certificate from the BB84 counts that no classical relay could do it; what the channel can carry; teleportation as a channel; and superdense coding through the hallway, more than one bit per photon.
NEW · PHASE 3Outdoors and toward orbit
The same link between two roofs, then two buildings at night, then a ground station tracking a satellite for six minutes: the beam spreading, the air, the sky's glow, and the key, with the twin saying when each one works.
NEW · PHASE 4The frontier: teleportation across a distance
Teleport on a free cloud processor with the two bits delayed, then through a swapping node, between the rooms with a fiber delay line, and from Earth to Mars with entanglement banked in memories: a spacetime diagram shows that nothing outruns the light time.
NEW · THE APPLICATIONA messenger keyed by the link
Send real encrypted messages in the browser with the key each link makes: a one-time pad with a Wegman–Carter tag, link-keyed AES, or the hybrid. See how many a day each link can key, how big a bank never refuses, and why a Mars messenger starts by carrying its key.
$0 · CLOUDCloud circuits
The collapse code (P11), teleportation and superdense coding (P12), and Majorana parity teleportation (P13): exact density matrices, the processor in 3D, and the commands for real hardware.
Generated from qll/systems/experiment_catalog.py and qll/systems/lab_scenes.py by scripts/build_lab.py. Experiments without a lab yet open their procedure; each one still has a twin, a test, and a data format.