Rigetti Computing (RGTI) has seen some serious movement recently. If you invested $5,000 a year ago, you'd be sitting on about $8,851 today. Despite the 77% return, the valuation looks pretty stretched. The company has a market cap over $7 billion but only brought in $7.5 million in revenue over the last 12 months. Analysts think the stock price has gotten ahead of the actual business and suggest looking at Alphabet for safer exposure to quantum computing.