Quantinuum
Quantinuum's trapped-ion systems are among the leaders on gate fidelity and logical-qubit results, using a quantum charge-coupled device (QCCD) architecture. Helios (launched Nov 2025) is the current flagship, succeeding System Model H2. Note three distinct things: the Quantinuum H-Series / Nexus direct cloud, the Quantinuum target exposed on Azure (a brokered configuration that may differ from direct access), and the Helios flagship system itself.
Helios — current flagship
The Helios and H2 figures below are vendor-reported; as of the documentation review date, public sources read this way, and specifics defer to Quantinuum's official announcements.
| Property | Value |
|---|---|
| Qubits | 98 all-to-all connected (barium-137) |
| Fidelity | 99.9975% single-qubit, 99.921% two-qubit |
| Logical qubits | 48 error-corrected (2:1 ratio) / 94 error-detected (Iceberg ~1:1); 94-qubit logical GHZ state. These are benchmark/code-specific demonstrations, not 48 general-purpose, long-lived, fault-tolerant application qubits. |
| Architecture | QCCD with a rotatable storage ring + junction routing; GPU-accelerated real-time classical co-compute |
| Launched | 5 Nov 2025 (commercial) |
The prior System Model H2 (56 ytterbium qubits) is reported to have reached a Quantum Volume of 2²⁵ (33,554,432) in Sept 2025 and remains in service; Helios roughly doubles its qubits, halves the two-qubit error, and is benchmarked on random-circuit-sampling and logical-qubit results rather than QV. As of the documentation review date, these are vendor-reported figures.
Native gates & QCCD architecture
| Aspect | Quantinuum H-Series |
|---|---|
| Native 1-qubit | U1q (parameterized rotation), Rz |
| Native 2-qubit | ZZ / RZZ (arbitrary-angle), 99.9%+ fidelity |
| Architecture | QCCD — ions physically shuttled between gate and storage zones |
| Connectivity | Effectively all-to-all via ion transport |
Targeting Quantinuum
The primary path is now Quantinuum's Nexus cloud and the Guppy quantum-programming language (with on-prem and NVIDIA GB200 options); Azure Quantum (Standard / Premium) remains a secondary channel. qalgora-Q can also import TKET / pytket-style circuits via OpenQASM.
teleport is a
predefined kernel from the teleportation docs.)import qalgora
# Planned Quantinuum adapter — NOT in the open reference build.
# qalgora.set_target("quantinuum", machine="Helios-1") # H-Series; or "azure" -> quantinuum.qpu.h2-1
# job = qalgora.sample_async(teleport, shots_count=2000) # teleport = predefined kernel
# print(job.get())Standout features
- All-to-all connectivity via ion transport between trap zones.
- Mid-circuit measurement, conditional logic, and qubit reuse — a measured qubit can be reset and reused, stretching effective width.
- In 2025 Quantinuum demonstrated fault-tolerant magic-state distillation at break-even — a key step toward universal fault tolerance.
References
- Quantinuum, System Model H2 product page. quantinuum.com
- Quantinuum, "Helios" — 98-qubit trapped-ion flagship (barium-137), launched 5 Nov 2025. quantinuum.com
Quantinuum
Quantinuum 离子阱系统在门保真度与逻辑比特成果上属于业界领先之列，采用量子电荷耦合器件（QCCD）架构。Helios（2025 年 11 月发布）是当前旗舰，接替 System Model H2。请区分三件不同的事物：Quantinuum 的 H-Series / Nexus 直连云、Azure 上暴露的 Quantinuum 目标（其代理配置可能与直连不同），以及 Helios 旗舰系统本身。
Helios——当前旗舰
下方 Helios 与 H2 的数据均为厂商宣称；截至文档核对日期，公开资料如此，具体以 Quantinuum 官方公告为准。
| 参数 | 数值 |
|---|---|
| 量子比特数 | 98 个全连接（钡-137 离子） |
| 保真度 | 单比特 99.9975%，双比特 99.921% |
| 逻辑量子比特 | 48 个纠错（2:1 比例）/ 94 个纠错检测（Iceberg 码约 1:1）；94 比特逻辑 GHZ 态。这些是特定编码与基准任务下的演示结果，并不等同于已拥有 48 个可任意编程、长寿命、通用容错的逻辑比特。 |
| 架构 | QCCD，配可旋转存储环 + 结点路由；GPU 加速的实时经典协同计算 |
| 发布时间 | 2025 年 11 月 5 日（商用） |
上一代 System Model H2（56 个镱离子比特）据报告在 2025 年 9 月达到量子体积 2²⁵（33,554,432），目前仍在服役；Helios 将比特数约翻倍、双比特错误率约减半，并以随机电路采样与逻辑比特基准（而非量子体积）作为主打指标。截至文档核对日期，以上均为厂商宣称数据。
原生门与 QCCD 架构
| 特性 | Quantinuum H-Series |
|---|---|
| 原生单比特门 | U1q（参数化旋转），Rz |
| 原生双比特门 | ZZ / RZZ（任意角度），保真度 99.9%+ |
| 架构 | QCCD — 离子在门区与存储区之间物理搬运 |
| 连通性 | 通过离子输运实现有效全连接 |
接入 Quantinuum
当前主要路径是 Quantinuum 的 Nexus 云与 Guppy 量子编程语言（并提供本地部署与 NVIDIA GB200 选项）；Azure Quantum（标准版 / 高级版）为辅助通道。qalgora-Q 还支持通过 OpenQASM 导入 TKET / pytket 风格的线路。
import qalgora
# 规划中的 Quantinuum 适配器 —— 开放参考实现中不包含。
# qalgora.set_target("quantinuum", machine="Helios-1") # H-Series；或 "azure" -> quantinuum.qpu.h2-1
# job = qalgora.sample_async(teleport, shots_count=2000) # teleport 为预定义内核
# print(job.get())亮点特性
- 全连接：通过离子输运在各囚禁区之间实现任意量子比特互联。
- 线路中测量、条件逻辑与量子比特复用 — 已测量的量子比特可重置后继续使用，从而扩展有效宽度。
- 2025 年，Quantinuum 在盈亏平衡点演示了容错魔态蒸馏——通向通用容错的关键一步。
参考文献
- Quantinuum, System Model H2 product page. quantinuum.com
- Quantinuum, "Helios" — 98-qubit trapped-ion flagship (barium-137), launched 5 Nov 2025. quantinuum.com