Sundar Pichai (left) and Daniel Sank pose with one of Google's quantum computers in the company's Santa Barbara lab in California, October 2019.Google/Handout via ReutersAlphabet stock surged Tuesday after revealing a breakthrough in quantum computing.The company's Willow chip can perform complex quantum computations in very little time.Also on Tuesday, Piper Sandler said AI tools like Gemini boost its confidence in Alphabet's growth.Alphabet stock surged on Tuesday, a day after the tech giant revealed a breakthrough in quantum computing.The Google parent company unveiled its new Willow chip on Monday, which it said can perform a benchmark computation test in under five minutes, compared to the 10 septillion years—longer than the universe's known existence—that it would take for the current fastest supercomputers to complete.Alphabet stock jumped as much as 6%, adding about $136 billion to its market valuation and representing its best intra-day gain since April 26.