Tensor Networks, Explained: The Hidden Door in the 2ⁿ Wall — and Why They Referee Every Quantum Advantage Claim

If you read the memory-wall post, you know the arithmetic: a full statevector simulation stores 2ⁿ amplitudes, so 25 qubits ≈ 512 MB, 30 ≈ 16 GB, 35 ≈ 512 GB. Past the high twenties, a phone doesn't g