Should you invest in the blue-chip stalwart or the speculative newcomer? IBM (IBM 0.62%) and IonQ (IONQ -0.67%) are both investing in the long-term growth of the quantum computing market. While traditional computers process data as binary "bits" of zeros and ones, quantum computers process zeros and ones simultaneously as "qubits." That approach makes quantum computers much faster than their traditional counterparts, but they're larger, more expensive, and more prone to making mistakes. As quantum computing ...