Alphabet Inc. is ending 2024 on a high, with a quantum computing breakthrough spurring a stock rally late in the year despite having no near-term commercial potential.Shares in the Google parent have jumped more than 30% from a September low, with a chunk of those gains coming after news about the capabilities of its quantum computer, which runs on its Willow chip. Quantum computing has provided a positive narrative amid worries about Alphabet falling behind AI-focused rivals like OpenAI as well...