Quantum/Machines/IonQ Tempo
USA · operational · Trapped ions
IonQ Tempo
IonQ Tempo is a trapped ions quantum computer operated by IonQ in USA. It has 100 physical qubits. It ranks 2 of 17 trapped ion machines in this table by physical qubit count. 5 sourced specs are in the spec sheet. 1 published benchmark or milestone record are listed below, each marked by who measured it.
Also known as Tempo
IonQ's barium system, reported at #AQ 64 in September 2025, three months ahead of IonQ's schedule. IonQ's Tempo page lists 100 as the target number of physical qubits and 99.9 percent as the target fidelity, so 100 is a design figure and no measured fidelity is recorded here. The page offers only an inquiry link and IonQ's backend documentation lists no Tempo backend, so access is left blank as inquiry-only. IonQ announced in December 2025 that a Tempo will be delivered to KISTI in South Korea for integration with KISTI-6, but no delivery date is given, so that unit is not listed separately.
Spec sheet
Technical details as the builder or a paper states them, each with its own source. A blank is a fact we could not source, not a zero. Fidelity and coherence figures are in the benchmark table below.
| Spec | Value | Basis | Note | Source |
|---|---|---|---|---|
| Processor | IonQ Tempo, fifth-generation IonQ system with 100 qubits | Vendor reported | IonQ calls Tempo its fifth-generation quantum computer; IonQ's Tempo page gives 100 as a target qubit count and trade press reports a 100-qubit system. | ionq.comquantumcomputingreport.com |
| Qubit type | Barium (Ba+) trapped ions | Vendor reported | Described as IonQ's first barium processor in 2025 analyst-day coverage and as a barium system in a 2024 IonQ release; the current Tempo page does not name the species. | quantumcomputingreport.comthequantuminsider.com |
| Access and pricing | Inquiry-based; not listed among IonQ's public cloud backends in its docs | Vendor reported | IonQ's Tempo page offers an inquiry form; the IonQ docs backend table checked on 2026-10-09 lists only Forte, Forte Enterprise, Aria and Harmony hardware. | ionq.comdocs.ionq.com |
| Predecessor | IonQ Forte | Vendor reported | Trade press compares Tempo with the earlier Forte Enterprise machine at #AQ 35. | quantumcomputingreport.comionq.com |
| Successor | IonQ Superion 256 | Vendor reported | IonQ's Superion release names Tempo as its most recent previous generation. | ionq.comquantumcomputingreport.com |
Published benchmark figures
These are numbers the builder or a paper reports for this machine, not results from a common test. The basis column says who measured them. What the metrics mean and why they are not comparable across technologies.
| Metric | Value | Measured | Basis | Note | Source |
|---|---|---|---|---|---|
| Algorithmic qubits (#AQ) | 64 | 2025-09 | Vendor reported | IonQ reported #AQ 64 on 100-qubit Tempo, three months ahead of schedule | quantumcomputingreport.comionq.com |
Timeline
- 2026-10: Status checked: operational
More from IonQ
- IonQ Harmony (decommissioned, 11 qubits)
- IonQ Aria (decommissioned, 25 qubits)
- IonQ Forte (operational, 36 qubits)
- IonQ Superion 256 (under construction, 256 qubits)
Comparable trapped ion machines
Closest in physical qubit count within the same technology. Counts of different qubit types are not interchangeable across technologies.
| Machine | Operator | Qubits | Status |
|---|---|---|---|
| IonQ Tempo at KISTI | KISTI | 100 | planned |
| Quantinuum Helios | Quantinuum | 98 | operational |
| Quantinuum Helios Singapore | Quantinuum | 98 | planned |
| Quantinuum H2 | Quantinuum | 56 | upgraded |
| IonQ Superion 256 | IonQ | 256 | under construction |
| IonQ Forte | IonQ | 36 | operational |