What is a utility-scale quantum computer?

What the term means

A utility-scale quantum computer is one that does work worth more than the machine costs. That is the meaning used by DARPA, the U.S. Defense Advanced Research Projects Agency. Its Quantum Benchmarking Initiative defines utility-scale operation as computational value that exceeds cost. DARPA also describes such a machine as industrially useful.

DARPA's definition is about value and cost. It does not name a number of qubits, the quantum bits these machines compute with. It also differs from quantum advantage. NIST, the U.S. standards agency, describes that as quantum computers outdoing classical computers for certain tasks.

How companies use it

Companies use the term in their own ways.

• IBM. In December 2023, IBM called its 133-qubit Heron chip the first in a series of utility-scale processors. It said its systems could serve as a scientific tool for problems beyond brute-force classical simulation.
• PsiQuantum. The company applies the term to a fault-tolerant machine it plans to build in Queensland, Australia. It said it broke ground there on June 18, 2026.

So the label alone does not say what a machine can do. Its meaning depends on who is using it.

How DARPA tests the claim

DARPA's program page lists three stages:

• Stage A. A company describes a utility-scale concept with a plausible path to being built.
• Stage B. It writes a research and development plan and names the risks.
• Stage C. It works with a government team to verify that the design can be built and run as intended.

DARPA said on October 7, 2026 that Atom Computing, Diraq, IBM and IonQ had advanced to Stage C. They joined Microsoft and PsiQuantum, which came from an earlier pilot program.

Where things stand in 2026

The program asks whether any approach can reach utility scale by 2033. DARPA's program page, as read in October 2026, gives the program's own estimate. It says that, on balance, at least one company is more likely than not to be able to create an industrially useful quantum computer by 2033. It also allows that no participant may show a path there. Both statements are DARPA's judgment, not test results.