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Entanglement Purification for Quantum Repeaters

Distill low-fidelity Bell pairs into fewer, higher-fidelity ones with the BBPSSW recurrence purification protocol used inside quantum-repeater links: watch bilateral CNOT-and-measure rounds trade pair count for fidelity in real time.

Quantum Physics3DAdvanced60 FPS📱 Mobile-adapted⇄ 2D version

Quantum-repeater links don't just need entangled pairs — they need high-fidelity ones, and every elementary link picks up noise from photon loss and imperfect memories. This simulation renders the BBPSSW recurrence purification protocol that repeater nodes run to fix that: pairs of noisy Bell pairs are combined two-by-two with a bilateral CNOT and a comparison measurement, probabilistically distilling fewer, cleaner pairs out of many noisy ones. Set the raw fidelity and purification depth, step through rounds (or let it auto-run), and watch the real trade-off a quantum internet has to budget for — fidelity goes up, but so does the exponential number of raw pairs consumed per surviving one.

⚙ Under the hood

Watch the BBPSSW recurrence purification protocol distill noisy Werner-state Bell pairs into fewer, higher-fidelity ones with a bilateral CNOT-and-measure round, and see the exponential resource cost of buying fidelity for a quantum-repeater link.

quantum repeaterentanglement purificationBell pair distillationWerner statequantum networksBBPSSW protocol

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install