Quantum computing stocks are rising quickly, but investors will need to be strapped in for a long ride. Market reaction has been fierce in the wake of Google-parent Alphabet Dec. 9 announcement of its new Willow quantum computing chip. Alphabet shares are up 7% since the reveal, but more of the price action has been focused on three much smaller companies with a combined market capitalization of under $8 billion, Quantum Computing Rigetti Computing and D-Wave Quantum which are up by an average of 159%.