IonQ Tempo

Overview

IonQ Tempo is the next step after Forte. It is designed to operate around 100 trapped-ion qubits, with faster gates, mid-circuit measurement, and better fidelity. IonQ called Tempo its fifth-generation quantum computer and says it is expected to be capable of commercial advantage for certain applications, a claim that remains to be demonstrated independently.

The system matters most as a marker on IonQ's roadmap. The company has said it expects 10,000-qubit chips in 2027, a roughly 20,000-qubit module in 2028, and multi-module systems with millions of physical qubits by 2030. Tempo is the first machine in that sequence.

History and background

IonQ announced Tempo as part of its technical roadmap in 2024 and 2025. In September 2025 it announced that a Tempo development system had achieved #AQ 64, three months ahead of its schedule, up from the #AQ 36 reached on Forte in December 2024. The register was a single ion chain with all-to-all connectivity.

A month later IonQ reported 99.99% two-qubit gate fidelity, a world record for any platform, using electronic qubit control from Oxford Ionics, which IonQ acquired in 2025 for about 1.075 billion dollars. The company's published system comparison lists Tempo with 100 qubits and availability in late 2026.

How it works

Tempo uses the same basic physics as other trapped-ion systems. Individual ions are suspended in vacuum and cooled with lasers, hyperfine states encode qubits, and entanglement is created through shared motion in the trap. IonQ describes Tempo as using barium ions rather than the ytterbium ions of earlier machines. Barium has transitions at visible wavelengths that are easier to address with commercial laser technology, which matters for scaling.

What changes is speed and control. Tempo is designed for faster two-qubit gates and for measuring some qubits mid-circuit while the rest keep computing, which is required for error correction and for algorithms that branch on measurement results. These upgrades address two of the biggest weaknesses of Forte.

The Electronic Qubit Control approach from Oxford Ionics replaces some laser control with microwave and electrode signals produced on a chip. Because chips can be manufactured with semiconductor methods, IonQ argues that this route scales better than assembling large optical systems. IonQ's acquisition of the foundry SkyWater in 2026 is part of the same strategy.

Connectivity

All-to-all on the development system (a 64-qubit register in a single chain reached #AQ 64); IonQ's roadmap describes many-to-many connectivity at larger scale

Specifications in detail

Key features

• Design target of 100 physical qubits
• #AQ 64 on a development system with a 64-qubit single-chain register
• Faster gates and mid-circuit measurement compared with Forte
• Design target of about 99.9% two-qubit fidelity
• Part of IonQ's roadmap toward 10,000-qubit chips (2027) and millions of qubits by 2030

Limitations

• The commercial 100-qubit system was not generally available as of this review
• #AQ is IonQ's own benchmark, so cross-vendor comparison is difficult
• The 99.99% fidelity record came from a separate prototype, and it has yet to be shown at full system scale
• Trapped-ion chains are hard to scale beyond a few hundred ions without linking modules

Timeline

What it is used for

• Early commercial pilots in optimization, chemistry, and machine learning
• Experiments with logical qubits and small error-correcting codes
• Research on quantum networking when linked with IonQ's photonic interconnects
• Benchmarking against competitors on application-style circuits

How it compares

• Compared with Forte, Tempo targets about three times the qubits, faster gates, and mid-circuit measurement.
• Compared with Quantinuum Helios, which has roughly a hundred barium-ion qubits and published high fidelities, Tempo is a direct competitor in size, and each company reports its own benchmarks.
• Compared with IBM Heron, Tempo has fewer qubits than the 156 on Heron but much better connectivity and fidelity, with slower gate speed.

Technical notes

IonQ reached #AQ 64 by nearly doubling its computational register from 36 to 64 qubits in one ion chain with all-to-all connectivity. In October 2025 the company reported 99.99% two-qubit gate fidelity using Electronic Qubit Control technology from its Oxford Ionics acquisition. That method controls ions with chip-integrated electrodes and microwaves rather than lasers, and it is central to IonQ's plan to scale to much larger systems.

Why it matters

Tempo is where IonQ's claims about commercial advantage and rapid scaling will first be tested. If a 100-qubit machine with the promised fidelity reaches customers on schedule, it strengthens the case that ions can scale. If delivery slips or the fidelity does not hold at full scale, the 2027 and 2030 targets will look less credible.

It is also a good example of why benchmarks need scrutiny. #AQ 64 is a real result on IonQ's own test suite, but it is not the same thing as 64 perfect qubits, and independent comparisons will matter more as customers start to buy.

Frequently asked questions

Keep exploring

• Company profile: IonQ
• Related processor: IonQ Forte (and Forte Enterprise)
• Related processor: Quantinuum H2
• Related processor: IBM Heron (r1, r2, and r3)

This profile is written for educational purposes and summarizes company announcements, published papers, and vendor specification sheets. Last reviewed: September 30, 2026. Figures marked as company-reported have not all been independently verified, and benchmarks differ between vendors, so compare them with care.

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