Core Viewpoint - Quantum computing stocks, particularly Rigetti Computing and D-Wave Quantum, have seen significant price increases, but analysts believe they are overvalued after substantial gains [1][2]. Rigetti Computing - Rigetti specializes in superconducting quantum computing, utilizing electrical circuits at near absolute zero temperatures to create qubits [3]. - The company has a vertically integrated model, manufacturing processors, designing software, and providing cloud-based services [3]. - Rigetti's gate-based systems are considered to have less immediate commercial value compared to D-Wave's annealing systems, although they may address more complex problems as the technology matures [4]. - In Q2, Rigetti's sales fell 42% to $1.8 million, and the GAAP net loss tripled to $40 million, with operations consuming $30 million in cash year-to-date [5]. - Rigetti's stock trades at an extremely high valuation of 1,253 times sales, suggesting a potential downside of 54% from its current price of $39 [6]. - Analysts have set a target price of $18 per share for Rigetti, indicating a significant downside risk [7]. D-Wave Quantum - D-Wave focuses on superconducting quantum computing and has historically excelled in annealing systems, which are effective for optimization problems [8]. - The company has recently ventured into gate-based systems but lacks vertical integration as it does not manufacture its own processors [9]. - D-Wave's quantum annealing systems currently have more commercial utility than Rigetti's gate-based systems, although scaling gate-based systems remains challenging due to high error rates [9]. - D-Wave reported a 42% increase in revenue to $3.1 billion in Q2, but the non-GAAP net loss was $0.08 per diluted share [10]. - The stock trades at 384 times sales, which, while lower than Rigetti's valuation, is still considered expensive, leading to a plausible downside of 41% from its current price of $34 [11].