More Problems with Quantum Computing

In theory, so long as there is no noise and no gates are applied, an arbitrary state of N qubits remains intact. This is true only if the energies of all qubits are exactly equal, which is hadrly possible. Otherwise, there will be a free evolution of the system defined by its energy spectrum. Also it is still not possible to factor the number 15 by Shor’s algorithm, and error correction is still non-existant.