Quantum computing may seem like a technology of the distant future, but it's rapidly becoming a reality. There are many pioneers in this space that are developing it toward what they hope will be a practical and useful technology, and IonQ (IONQ +8.02%) is among the best. IonQ stock is also trading well below its all-time highs, making it seem like a great stock to buy now. The market is in a risk-off state, but if that flips, IonQ could rally to new highs, making today a perfect time to buy a company that's among the front-runners in the race to bring viable quantum computing technology to market. IonQ has a long way to go Quantum computing is possible, but at this stage, the results it generates are not reliably usable. Every quantum computer is built around qubits -- their fundamental units of data calculation -- which are incredibly sensitive to outside interference. Tiny amounts of "noise" in the system can cause qubits to change state, rendering the results of their calculations inaccurate. Because of this, error reduction and error mitigation are two of the chief challenges that every player in the quantum computing space is focused on. Right now, IonQ's technology is the best in the world at delivering accurate results. It boasts a 99.99% two-qubit gate fidelity measurement. But that's still a long way from the level of accuracy delivered by classical computers. IonQ is working to develop a fault-tolerant 10,000-qubit quantum computer, which it believes to be the minimum size necessary for a system that could reliably deliver a quantum advantage compared to today's supercomputers and achieve mainstream viability. Currently, its 256-qubit system is undergoing testing, and it's expected to be a huge step forward for early adopters.IonQ is also working with numerous customers and partners that