Random Circuit Sampling Lab

This simulator reproduces the actual protocol behind the 2019 Google Sycamore "quantum supremacy" claim: a grid of qubits is driven through repeated layers of independent random single-qubit rotations followed by a fixed entangling gate across neighbouring pairs, exactly as on a real superconducting-qubit chip. A genuine complex statevector of dimension 2^N is simulated in full, letting you watch the output-bitstring probability distribution scramble from a single spike at |0…0⟩ into the exponential "speckle" pattern (a Porter–Thomas distribution) that is the statistical signature of quantum chaos — the same signature real experiments cross-check against to certify that a quantum processor, not a classical one, produced the samples. Live readouts track circuit depth, the exponentially growing classical memory cost, and an estimated cross-entropy benchmarking (XEB) fidelity that decays as gate noise accumulates, mirroring how real hardware is actually graded.