002 Entanglement: a Bell Pair Simulator
SIMULATOR Runs on your device. Not a real quantum computer.
The circuit
Two qubits start at 0. Apply H to qubit 0, then a CNOT with qubit 0 as control and qubit 1 as target. The circuit is: q0: H, control ● ; q1: target ⊕. The pair is now in a Bell state.
Run it
Entangled pair (H then CNOT)
What if no entanglement? Two independent coins (H on each, no CNOT)
Outcome labels read qubit 0 first, so 01 means qubit 0 is 0 and qubit 1 is 1.
What you are seeing
For the entangled pair, only 00 and 11 ever appear, each about half the time. Each qubit on its own looks like a fair coin, yet the two always agree. For two independent coins all four outcomes appear, about a quarter each, and they match only half the time. The extra agreement is the correlation that entanglement provides.
Two cautions. First, entanglement does not let you send a message faster than light, because each side's result is random on its own and the correlation only shows when the results are compared. Second, ordinary correlations can look similar in this simple test. Experiments called Bell tests use other measurement choices to show that quantum correlations cannot be explained by pre-agreed local answers. The 2022 Nobel Prize in Physics honoured such experiments (see the sources). Learn more in entanglement explained.
How it works: the simulator keeps the exact quantum state of the qubits as a list of numbers, applies each gate to it, then draws random samples from the resulting probabilities. The random numbers are ordinary pseudo random numbers from your browser, and a real device would add noise. No QNT, wallet or account is needed.
Sources
This is an educational simulator, not financial advice. QUANTUM (QNT) is an independent community token on Solana and does not perform quantum computation.