The Other Kind of Quantum Computing
H. John Caulfield and Lei Qian
Here we consider a type of quantum computing that does not involve quantum entanglement and that can be called a single (as opposed to entangled) quantum computing (SQC). Like quantum computing involving quantum entanglement (EQC in brief), SQC uses qubits, ensures “free parallelism ”, uses reversible operations, avoids the irreversible loss of information upon detection and can be used only for a few well-defined tasks. But there the similarities between EQC and SQC end. We discuss these similarities and differences of SQC and EQC and provide a few examples of the former’s application.