There are many algorithms for which it has been mathematically proven that a quantum computer can generate results that would take a classical computer an unreasonable amount of time to generate. Unfortunately, today's quantum computers either can't run those algorithms or can only run simplified versions that classical computers can also handle. This has left the field facing a challenging question: Can we demonstrate the promise of quantum computers on today's noisy, limited hardware?

That's a more difficult question than it may first appear. If you generate a result that's out of reach of today's regular computers, it may not be possible to verify that you got the right result. And given that today's quantum computers are somewhat error-prone, getting the wrong result is a distinct possibility. Further, in the absence of a mathematical proof of the capabilities of quantum hardware, it's possible that a better classical algorithm could outperform the quantum hardware.

These issues inspired IBM to launch a quantum advantage tracker. On Thursday, the company announced three new entries that it says clearly show a quantum advantage, each using a different approach to overcoming errors and validating quantum results. "Trusted computing when you can do classical simulations is irrelevant," IBM's Jay Gambetta told Ars. "Trusted computing when you can't do classical simulations is a big deal."

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This week, the Model Context Protocol (MCP) , an open source standard for how AI systems interact with external tools and data sources, saw its largest update since its introduction. Most notably, MCP's protocol core is now stateless, so requests are no longer dependent on a session tied to an individual server instance. This change has the potential to address long-standing barriers to scalability.

The blog post announcing the specification, written by lead maintainers David Soria Parra and Den Delimarsky (who both work at Anthropic), says:

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A quantum-resistant cryptography algorithm that was under consideration to become an official US standard has been taken out of the running after an Anthropic security model helped find a flaw that rendered it broken.

The algorithm taken out of commission is known as HAWK . It's a digital signature scheme designed to withstand future attacks from quantum computers. HAWK had survived two rounds of testing by NIST (the National Institute of Standards and Technology) for evaluating the security of PQC (post-quantum cryptographic) algorithms through widespread testing. HAWK was in a third round of testing designed to catch precisely the kinds of flaws Mythos helped uncover.

As a result of results Anthropic announced Monday, the developer of HAWK said Tuesday he was withdrawing it.

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Elon Musk has settled his lawsuit with advertisers that he once claimed should be criminally prosecuted for refusing to advertise on his social media platform, X.

In a joint statement that reveals little about the deal, the World Federation of Advertisers (WFA) and X said that they were “putting the litigation involving the Global Alliance for Responsible Media (GARM) behind them.”

X sued the WFA in 2024, shortly after a series of brands boycotting X caused the platform's revenue to drop by $1.5 billion by the end of 2023. Musk became upset, declaring “it is war” on X about eight months after he told advertisers who refused to buy X ads to “go fuck yourself.”

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Humanoid robots and four-legged robots made in China fall squarely under a new ban imposed by the US Federal Communications Commission on foreign-made robots. But the sweeping prohibition covers a wide variety of robots manufactured anywhere abroad, including the newest robot vacuum cleaners.

The Trump administration's FCC justified the ban on foreign-made robots by referencing cybersecurity vulnerabilities previously discovered in robots specifically made by Chinese companies. On July 28, the federal agency added “foreign-produced advanced robotic devices” to its Covered List of technologies “deemed to pose an unacceptable risk to the national security of the US or the safety and security of US persons.”

However, the FCC cannot update the Covered List on its own initiative and is required by law to follow the direction of a “qualifying national security authority.” The agency describes the White House as having “convened an executive branch interagency body” that “included appropriate national security agencies,” which determined foreign-made robots as presenting a national security risk.

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A lawsuit against Comcast's cable division alleges that a store manager humiliated the lowest performing salesperson each month with a strange ritual in which a cream pie was smashed into the employee's face. The lawsuit claims the store manager took videos of the assaults and ordered employees to participate in the assaults and record their own videos.

A Comcast store in Plainville, Connecticut, "had a policy that the highest-ranked Retail Sales Consultant for the prior month was instructed by his or her supervisor—Ms. Peterson, the Comcast Store manager—to tie the lowest-ranked sales consultant for the prior month to a chair in the back office and thereafter assault that person by violently smashing a cream pie in their face," the complaint alleged.

Plaintiff David Figueroa's lawsuit said he was hired as a retail sales consultant on February 2, 2026, and was supervised by store manager Sully Fuentes Peterson. Figueroa alleges that Peterson "designed and implemented" the pie-in-face ritual to meet goals related to sales and positive responses in customer surveys.

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Having it your way is one of the benefits of being an Ars Pro subscriber. You get all of the great content you come to Ars for every day, but you get to choose how you parse it. Some readers want the classic blog-style homepage. Others want as many headlines as possible packed onto one screen. Some want a wider text column; others would happily never see another story about a topic they don’t follow.

We've got you covered.

Both Grid and List views are available for all readers, but subscribing to Ars unlocks two additional layout options. Our old-school Classic view reprises the original site layout from 1998, the year the Ars Orbiting HQ launched.

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Governments around the world are suddenly very keen on online age verification requirements. In some places, this takes the form of ID requirements to access adult content, but several US states have also focused on app stores. With these laws now going into effect, Google has announced an expansion of its beta Play Age Signals API, which it claims will allow developers to confirm user ages without impinging on privacy.

Google's system doesn't require an ID or selfie verification—it's connected to the company's existing Family Link app. The idea is that parents will set age ranges for their kids' managed accounts. For example, you might set a range like 16–17, allowing apps to tailor experiences and content for teenagers.

Google notes that the ranges are dynamic and may change as young users get older. So a kid who's 13 may be in the same app content bracket for a few years before hitting the next level. Parents have the option to set and share these ranges if they want that additional level of control over what their children can access in Google Play. However, it's not mandatory for child accounts—it's fully opt-in and can be turned off at any time.

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Elon Musk’s xAI is trying to sue its way out of a Grok reckoning as arrests of Grok users accused of making child sex abuse materials (CSAM) have triggered lawsuits from kids to sue xAI to force changes to the tool to block harmful outputs.

Earlier this month, xAI started suing users who are allegedly circumventing its safeguards to generate AI CSAM, seemingly hopeful that an early court win will guarantee it’s not liable for supposedly user-generated content.

For its next move, the Grok maker pointed to that lawsuit in a complaint filed Monday, accusing Minnesota of trying to force changes to Grok and Grok Imagine by enforcing a ban on nudification technology that would guarantee that xAI was liable for the harmful outputs, as well as outputs that allegedly weren’t sexualizing people without consent. According to xAI, suing a Grok user is proof that xAI is already doing everything in its power to punish bad actors, and therefore, Grok deserves safe harbor from Minnesota’s ban.

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