How is the Grover algorithm ever scalable if physical qubits and quantum gate hardware are not available and even if a 1000 were available, the system coherence cannot maintain entanglement over the required number of iterations? I can do a software simulation of entanglement using MatLab kron function for the tensor multiply but just try it! the output data dimensions explode with the tensor product exponentially so it is definately not scalable, and still there is no way to actual define the trace on the exploded result. There needs to be a single step quantum search instead. Moveovergrover (talk) 23:59, 17 March 2012 (UTC)