Quantum/Machines/IBM-Euskadi Quantum System Two
Spain · operational · Superconducting circuits
IBM-Euskadi Quantum System Two
IBM-Euskadi Quantum System Two is a superconducting circuits quantum computer operated by IBM-Euskadi Quantum Computational Center in Spain. It has 156 physical qubits. It ranks 7 of 43 superconducting machines in this table by physical qubit count. 12 sourced specs are in the spec sheet. No benchmark figures are recorded for it yet.
Also known as IBM Quantum System Two in Donostia
Europe's first IBM Quantum System Two, inaugurated 14 October 2025 at the IBM-Euskadi Quantum Computational Center in Donostia-San Sebastian. Ikerbasque and IBM both describe a single 156-qubit Heron processor, while Quantum Computing Report says two Heron chips (312 qubits), so the count is disputed and the single-chip figure is used. IBM's hardware page lists San Sebastian among System Two sites. No benchmark figures were found for this unit.
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 | IBM Quantum Heron, 156 qubits | Vendor reported | Ikerbasque and IBM both describe a single 156-qubit Heron; neither states the Heron revision (r2 or r3). | ikerbasque.netibm.com |
| Qubit type | fixed-frequency transmon qubits with tunable couplers | Vendor reported | IBM describes Heron as fixed-frequency qubits with tunable couplers and a 2025 preprint on Heron r2 calls them transmon; family-level, the Heron revision at Donostia is not stated. | ibm.comarxiv.org |
| Topology | heavy-hex lattice, 156 qubits | Vendor reported | IBM documentation gives Heron r2 as 156 qubits in a heavy-hexagonal lattice; family-level, the Heron revision at Donostia is not stated. | quantum.cloud.ibm.comarxiv.org |
| Max connectivity | 3 | Independent | A 2025 paper on ibm_marrakesh says heavy-hex sites have coordination numbers two and three, so a qubit couples to at most three others; family-level. | arxiv.org |
| Native gates | CZ, RZ, SX, X, ID | Vendor reported | IBM documentation lists these supported gates on a Heron r2 backend and a 2024 survey lists the same basis gates for Heron r2; family-level, not read from this unit. | quantum.cloud.ibm.comarxiv.org |
| Single-qubit gate time | 36 ns | Independent | Median single-qubit gate length on the Heron r2 backend ibm_marrakesh in a 2026 paper; family-level, not measured on this unit. | arxiv.org |
| Two-qubit gate time | 68 ns | Independent | Median CZ duration on Heron r2 backends ibm_marrakesh (2026 paper) and ibm_fez (2024 survey); family-level, the Heron revision at Donostia is not stated. | arxiv.orgarxiv.org |
| Cooling and environment | dilution refrigerator (Bluefors KIDE platform in the System Two cryostat) | Vendor reported | IBM's 2022 blog says System Two would first use Bluefors' Kide platform and a Bluefors-focused Quantum Insider post (Jan 2024) says Kide sits at the heart of System Two; IBM-wide, not a unit-specific statement. | ibm.comthequantuminsider.com |
| Operating temperature | 10 mK | Vendor reported | IBM says the qubits sit about a hundredth of a degree above absolute zero and Bluefors lists a typical Kide base temperature of 10 mK; platform-level, not measured on this unit. | ibm.combluefors.com |
| Software | Qiskit SDK, Qiskit Runtime | Vendor reported | IBM's stack for its quantum systems; the 2023 System Two launch release names Qiskit Runtime and Qiskit 1.0, and IBM documentation uses qiskit-ibm-runtime. | newsroom.ibm.comquantum.cloud.ibm.com |
| Access and pricing | on-premises at the IBM-Euskadi Quantum Computational Center; dedicated access for the center team and BasQ researchers | Vendor reported | Ikerbasque says the center's team has access to the system and IBM says BasQ gets dedicated, special access; no price is published. | ikerbasque.netibm.com |
| Roadmap | designed to scale and integrate multiple processors in the future | Vendor reported | Stated by Ikerbasque at the 14 October 2025 inauguration; no dates or later processors are given. | ikerbasque.net |
Timeline
- 2025-10-14: First operational
- 2026-10-04: Status checked: operational
Comparable superconducting machines
Closest in physical qubit count within the same technology. Counts of different qubit types are not interchangeable across technologies.
| Machine | Operator | Qubits | Status |
|---|---|---|---|
| IBM Heron | IBM | 156 | operational |
| RIKEN IBM Quantum System Two | RIKEN | 156 | operational |
| IBM Quantum System Two (Chicago) | IBM | 156 | under construction |
| LUMI-IQ | CSC | 150 | planned |
| Origin Wukong-180 | Origin Quantum | 180 | operational |
| IBM Eagle | IBM | 127 | decommissioned |