Xanadu Quantum vs. IonQ: The Better Quantum Computing Stock Buy for 2026 - The Motley Fool

By Robert Izquierdo – Jun 18, 2026 at 12:15PM EST KEY POINTS Xanadu is a newcomer to Wall Street, while IonQ has been public since 2021. Xanadu uses light particles, called photons, to power its quantum computers. IonQ focuses on ions as the vehicle to deliver quantum devices with high accuracy. Artificial intelligence stocks have been hot, and the next big investment opportunity could be in quantum computing. A number of pure-play quantum companies have gone public in the past few years, capitalizing on investor interest in the technology. One of the newest in this space is Xanadu Quantum Technologies ( XNDU 1.47% ). Its initial public offering (IPO) occurred on March 27. By comparison, IonQ ( IONQ +3.40% ) is a relative veteran, having gone public in 2021. Is Xanadu or IonQ the better investment for investors seeking exposure to this up-and-coming industry? Here's a deeper look at both to arrive at an answer. Image source: Getty Images. A look at Xanadu Xanadu claims to be the first pure-play photonic quantum computing company to go public. The use of photons in its technology differentiates it from IonQ, which employs ions. Xanadu CEO Dr. Christian Weedbrook said he founded the company with "a conviction that photonics was the right path to a scalable quantum computer." His claim has merit, though photons and ions offer distinct advantages and downsides. Photons are light particles with properties that make them a compelling choice to power quantum computers. They are well-suited for quantum cryptography because their random quantum states make every photon inherently secure. Moreover, photons can transmit quantum data over long distances, rendering them suitable for quantum networking. Computer networks are essential for artificial intelligence, since networked devices unlock greater computational ability. In fact, IonQ added photonics to its solutions for these reasons. Xanadu is on a roll. It partnered with AI semiconductor giant Advanced Micro Devices and quadrupled revenue growth in the first quarter, reaching $2.8 million compared to $0.7 million in the previous year. Expand NASDAQ: XNDU Xanadu Quantum Technologies Today's Change (-1.47%) $-0.20 Current Price $13.37 KEY DATA POINTS Market Cap $4.1B Day's Range $12.68 - $14.25 52wk Range $6.97 - $42.44 Volume 9.2M Avg Vol 5.5M The case for IonQ IonQ is focused on building an expansive quantum computing business. It boasts a vast array of quantum-related solutions from computer processors to cybersecurity, including quantum networks extending into outer space. It was one of the first in the world to deploy a citywide quantum computer network, implemented in Geneva last year. It chose ions to drive its machines because they can deliver high fidelity, a measure of the accuracy and reliability of quantum calculations. One challenge for companies in this industry is that quantum particles are inherently unstable, causing calculation errors. A quantum computer that can't produce accurate results is worthless, so IonQ pursued ions to overcome this hurdle. It set a world record for fidelity last year. IonQ's technological advances enabled it to achieve robust revenue growth as customers adopted its technology. The company reported first-quarter sales of $64.7 million, representing an outstanding 755% year-over-year increase. Its strong start to 2026 led IonQ to raise its full-year outlook to $260 million to $270 million in revenue, an impressive jump from $130 million in 2025. Expand NYSE: IONQ IonQ Today's Change (3.40%) $1.86 Current Price $56.55 KEY DATA POINTS Market Cap $20B Day's Range $52.92 - $56.66 52wk Range $25.89 - $84.64 Volume 20.4M Avg Vol 30.4M Gross Margin -2879.52% Picking between Xanadu and IonQ Although both companies are growing sales, this has come with rising costs. Xanadu reported a Q1 operating loss of $23.3 million, up from $12.8 million in the previous year. IonQ's Q1 loss from operations was more severe, totaling $271.5 million compared to a loss of $75.7 million in 2025. The company acquired multiple businesses in the past year, and this caused expenses to balloon. Both have amassed a substantial cash hoard to fund operations as they ramp up sales. At the end of Q1, Xanadu held cash and equivalents of $272.5 million, while IonQ had cash, cash equivalents, and investments of $3.1 billion. Quantum computing is still in its early days, making it anyone's game to win. At this stage, Xanadu, IonQ, or both could gain significant market share. For deciding between these two, however, I believe IonQ has the greater opportunity to be a winner over the long run, making it the better stock to buy. IonQ's sales are far higher than Xanadu's, indicating its technology has gained more traction in the market. Its cash funds are significantly larger as well, and could last quite some time if the company can reduce costs. It has assembled an impressive technology stack that positions it for ongoing revenue growth. From a valuation perspective, neither is a cheap stock. That said, Xanadu's price-to-sales ratio is over 700 compared to IonQ's 98, making the latter look like a bargain. Considering these myriad factors, IonQ looks like the more appealing quantum computing investment. Read Next Jun 17, 2026 By Justin Pope Buy, Sell, or Hold: Where 5 of Wall Street's Hottest Stocks Stand Right Now Jun 16, 2026 By Micah Zimmerman Quantinuum's IPO Is Putting Pressure on IonQ, Rigetti Computing, and D-Wave Quantum. Here's Which Quantum Computing Stock Survives the Reset. Jun 15, 2026 By Rich Smith Why IonQ Computing Stock Just Popped Jun 14, 2026 By Keith Noonan Why IonQ Stock Ended This Week in the Green Despite Early Sell-Offs Jun 12, 2026 By Matt DiLallo 3 Best Quantum Computing ETFs for 2026 and How to Invest Jun 8, 2026 By Anders Bylund 9 Best Quantum Computing Stocks for 2026 and How to Invest ABOUT THE AUTHOR Robert "Izzy" Izquierdo is a contributing Motley Fool stock market analyst covering information technology, consumer discretionary, consumer staples, and communication services sectors. Prior to The Motley Fool, Izzy was head of product management at Target Media Partners, developing and launching multimillion-dollar software used by businesses such as Charter Communications. Prior to that, he worked at Yahoo! and startups on software products in connected TV, AI, consumer apps, and digital advertising. He holds a bachelor’s degree in English literature from UCLA and is certified in software product management. TMFWryWrite STOCKS MENTIONED IonQ NYSE: IONQ $56.46 (+3.24%) +$1.77 Motley Fool Stock Advisor’s Latest Pick Get Access ---% Avg Return Xanadu Quantum Technologies NASDAQ: XNDU $13.37 (-1.47%) -$0.20 *Average returns of all recommendations since inception. Cost basis and return based on previous market day close.