Quantum/Machines/IonQ Harmony
USA · decommissioned · Trapped ions
IonQ Harmony
IonQ Harmony is a trapped ions quantum computer operated by IonQ in USA. It has 11 physical qubits. It ranks 14 of 15 trapped ion machines in this table by physical qubit count. 7 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 Harmony
IonQ's earlier cloud system with 11 physical qubits and #AQ 9. IonQ's system page states it was retired in 2024. Launch date and site are not given on the page consulted.
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 | Harmony, IonQ first commercial system, early trapped-ion architecture from 2018 to 2020 | Vendor reported | IonQ page says Harmony launched in 2020 and was retired in 2024. | ionq.com |
| Qubit type | 171Yb+ hyperfine ion | Vendor reported | IonQ page states Yb-171+ is used for efficient laser cooling and high-performance gates. | ionq.com |
| Topology | All-to-all connectivity via an individual addressing beam for each qubit | Vendor reported | As stated on the IonQ system page. | ionq.com |
| Cooling and environment | Titanium vacuum chamber with laser cooling of Yb-171+ ions | Vendor reported | IonQ page describes the titanium chamber as isolating qubits from stray air molecules; no cryogenic stage is described. | ionq.com |
| Fabrication | Ion trap from Sandia National Laboratories | Vendor reported | IonQ page says Harmony leverages a trap from partners at Sandia Labs. | ionq.com |
| Access and pricing | Retired in 2024; formerly a commercially available IonQ system | Vendor reported | IonQ docs backend table lists Harmony as Retired. | ionq.comdocs.ionq.com |
| Successor | IonQ Aria | Vendor reported | Aria page compares improvements over Harmony, including chamber, trap and uptime. | ionq.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) | 9 | 2026-10 | Vendor reported | #AQ 9 as stated on IonQ system page; page dated to retirement in 2024 | ionq.com |
Timeline
- 2024: Retired
More from IonQ
- IonQ Aria (decommissioned, 25 qubits)
- IonQ Forte (operational, 36 qubits)
- IonQ Tempo (operational, 100 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 |
|---|---|---|---|
| AQT IBEX Q1 | AQT | 12 | operational |
| Quantinuum H1 | Quantinuum | 20 | upgraded |
| Reimei | RIKEN | 20 | operational |
| AQT LRZ Ion-Trap System | LRZ | 20 | operational |
| PIAST-Q | PSNC | 20 | operational |
| QSCOUT | Sandia National Laboratories | 6 | operational |