Quantum computing may not be as hot as artificial intelligence (AI) is right now, but it could be in the future. Useful quantum computing is often projected to come about in 2030, which isn't all that far away. We're already seeing several companies have success in the quantum computing industry, and I think there are several businesses that are worth looking into. Three that are near the top of my buy list in May are IonQ (IONQ +3.27%), D-Wave Quantum (QBTS +3.00%), and Alphabet (GOOG +0.44%) (GOOGL +0.66%). All three of these companies are major competitors in the quantum computing industry, and all are seeing major success right now. I expect these three to be some of the major players once 2030 rolls around, and by investing in them now, you'll position yourself for ultimate upside. 1. IonQ IonQ (IONQ +3.27%) is one of the more popular pure-play quantum computing picks, mainly because of its supreme accuracy. There are two primary reasons why we don't have widespread quantum computing right now. First, there is accuracy. Quantum computers aren't accurate enough to be used in a commercial setting, and sometimes the results they provide are indistinguishable from background noise. Second is the number of qubits available in a system. Qubits are the base computing unit in a quantum computer (versus a bit in a traditional computer). There is a certain number of these qubits that are required for an operation to be useful at the scale necessary in a commercial setting, and every company is racing to optimize these two parts of the system. IonQ is a leader in both fields, as it has a world-leading 2-qubit gate fidelity of 99.99%. That's a much higher mark than its peers, and it's also working to develop a 256-qubit system that has the