Rigetti Computing vs. Quantum Computing: Which Quantum Tech Stock Is a Better Buy in 2026? - The Motley Fool
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The quantum computing race is heating up, but choosing a winner involves navigating significant financial losses. Will you favor Rigetti Computing (RGTI 5.13%) or the smaller Quantum Computing (QUBT 5.08%) today?Rigetti builds quantum devices using superconducting technology while Quantum Computing focuses on photonics as its approach. Both companies are early-stage players in a field that could redefine computing power. This comparison evaluates their financials and business models to see which is better positioned for your portfolio.The case for Rigetti ComputingRigetti Computing builds superconducting quantum processors and offers access through its own cloud platform. It serves national laboratories and research centers within the tech stocks landscape, with a heavy reliance on the U.S. government. Sales to government entities comprised roughly 90.2% of total revenue in its 2025 fiscal year, which adds a layer of risk to the business.In its 2025 fiscal year, revenue reached $7.1 million, representing a decrease of nearly 34.3% from the prior year. The company reported a net loss of $216.2 million for the period. The net margin reached approximately -3,050.4%, indicating that losses were significantly larger than the total revenue generated.As of its December 2025 balance sheet, the debt-to-equity ratio is zero. This indicates that the company has no total debt relative to its shareholder equity. The current ratio, which measures the ability to cover short-term liabilities with current assets, is very high at nearly 37.4x. Free cash flow, which is cash from operations minus capital expenditures, was negative $77.2 million.The case for Quantum ComputingQuantum Computing develops integrated photonics and quantum optics products for high-performance computing. The company says its technologies serve diverse markets, and it has operations in Arizona, California, and Massachusetts. It operates a specialized foundry for integrated photonics to support its machine development.In its 2025 fiscal year, revenue reached roughly $682,000, indicating an 82.8% increase compared to the previous fiscal year. Despite this growth, the company reported a net loss of $18.7 million. The net margin was approximately -2,738.1%, which highlights the fact that the company is currently spending much more on research than it earns.As of its December 2025 balance sheet, the debt-to-equity ratio is zero. The current ratio is roughly 102.4x, which suggests a high level of liquid assets relative to upcoming bills. Free cash flow was approximately negative $37 million, and investors should monitor how quickly the company uses its cash reserves.Risk profile comparisonRigetti Computing faces significant revenue concentration, as most of its business comes from U.S. government contracts. This creates high exposure to budget cuts or changes in federal fiscal policy. The company also faces intense competition from massive tech firms such as Alphabet and IBM., which also use superconducting technology.Quantum Computing relies heavily on chip manufacturers in East Asia, which exposes it to geopolitical instability and trade restrictions. The company has limited experience in large-scale manufacturing, making the transition from research to commercial production difficult. It also competes for talent and market share against established giants like IBM.Valuation comparisonBoth companies lack a Forward P/E due to negative earnings estimates, and they carry a high P/S ratio.MetricRigetti ComputingQuantum ComputingSector BenchmarkForward P/En/an/a40.4xP/S ratio848x530xSector benchmark uses the SPDR XLK sector ETF. Valuation metrics sourced from Financial Modeling Prep (FMP) and may differ from other data providers.Which stock would I buy in 2026?Having studied and invested in the quantum computing sector for a few years, my choice between investing in Rigetti Computing or Quantum Computing Inc., which refers to itself as QCi, is Rigetti. That said, quantum computer technology is still in its early days, and the long-term winner will be the one with the approach that captures widespread commercial adoption. At this stage, both companies offer viable solutions.My preference for Rigetti over QCi involves several factors. Its revenue is larger, which suggests its technology is capturing more customers. While 2025 sales were down year over year, that appears to be changing in 2026. Its first-quarter revenue totaled $4.4 million, up from 2025’s $1.5 million. It was also awarded a contract with the U.S. government worth up to $100 million in May. Moreover, superconducting quantum tech is more widely adopted as a promising methodology, which is why IBM and Google use it.QCi shows some traction in gaining customers. Its Q1 sales were $3.7 million compared to just $39,000 in 2025. However, it was not among the companies that received the government award in May.While neither stock is particularly cheap from a valuation perspective, investing in Rigetti is about its likelihood for long-term success. Thanks to its higher revenue and quantum computing approach, which is more widely-adopted in the industry, it looks like the better investment compared to QCi.