Quantum computing has the potential to perform computations that currently take years with CPUs/GPUs in seconds/minutes.
The key element in quantum computing is the qubit, representing the number of information bits a quantum computer can compute simultaneously.
Entanglement is a crucial mechanism that enables simultaneous computation by exploiting the coherence between quantum objects.
Different competing technologies for quantum computing include superconductors, photonic, ion/atom traps, and silicon spin, each with its own advantages and disadvantages.