IonQ, a quantum computing company based in College Park, Maryland, has agreed to acquire Elisity, a network security company, in an all-stock deal valued at up to $1.3 billion, according to a filing with the Securities and Exchange Commission (SEC) signed Tuesday. The purchase folds a Zero Trust access-control vendor into a company that sells encryption built to resist future quantum computers, a sign that preparing for quantum-era threats is being sold as part of everyday network security rather than as a separate project.

Zero Trust is a security approach that treats no user or device as trustworthy simply because it is already inside the corporate network. Each connection has to be justified by a policy. Elisity's version, known as microsegmentation, divides a network into small zones so that an intruder who gets in cannot roam freely.

What Happened

Under the merger agreement, dated Oct. 9, IonQ will pay Elisity's owners IonQ shares worth $1.15 billion at closing, reduced by any value that has leaked out of Elisity since July 31, 2026, the filing says. Elisity's securityholders can earn up to $150 million more in stock if the company meets revenue milestones between Aug. 1, 2026, and Jan. 31, 2028. The number of shares will be set by IonQ's average trading price over 20 trading days before closing, with that price held between $33.07 and $49.61. Separately, IonQ will set aside $100 million in restricted stock units, shares that vest over four years, to retain Elisity employees.

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Closing requires government approvals, no material adverse change at Elisity and New York Stock Exchange approval to list the new shares. Either side can walk away if the deal has not closed by Jan. 7, 2027. IonQ's press release, dated Oct. 12, says it expects to close in the fourth quarter.

Elisity, founded in 2019, sells software that enforces least-privilege rules, meaning each identity reaches only what it needs, for users, devices, workloads and AI agents. Its IdentityGraph component combines asset, identity and risk data from Elisity and partner tools. The company reports more than 100 customer deployments, doubled revenue and customer counts over the past year, and zero churn among deployed customers, figures the release does not support with dollar amounts. SecurityWeek reported that Elisity has raised more than $70 million and that its chief executive, James Winebrenner, and his team will stay on.

Why It Matters

IonQ plans to combine Elisity's platform with its post-quantum cryptography, new encryption methods designed to withstand quantum attacks, and quantum key distribution, which uses physics to exchange encryption keys in a way that reveals eavesdropping. The roadmap adds an inventory of each customer's cryptography and its risk to IdentityGraph, so security teams can decide which systems to upgrade first.

For security buyers, that means the vendors they rely on for access control may soon also shape their post-quantum plans, and existing Elisity customers face a change of owner. In the release, IonQ chief executive Niccolo de Masi said "Q-Day is coming much faster than predicted," referring to the point when quantum computers could break today's public-key encryption. Winebrenner told CyberScoop that segmentation helps contain threats but does not replace upgrading the cryptography itself.

The deal also treats AI agents as identities that need the same access rules as people and devices, a problem Winebrenner described to CyberScoop as knowing not just that an agent is approved but whose authority it is using and when its access should end.

Context

The pitch rests on "harvest now, decrypt later," the risk that adversaries steal encrypted data today to unlock once quantum computers mature. CyberScoop reported that a recent Trump administration executive order moved the federal post-quantum migration target from 2035 to 2030, and agencies owe the White House migration plans by the end of October. IonQ says it has already built quantum-safe national networks in Switzerland, Poland, Romania and Slovakia.

What to Watch

Regulatory clearance and closing before the Jan. 7, 2027, outside date; how quickly IonQ ships the cryptographic inventory feature; and whether the earnout, tied to revenue through January 2028, pushes Elisity toward the government buyers now drafting post-quantum plans.