IQM Garnet vs Rigetti Ankaa-3 Specs, Pricing & Performance [2026]
Quick Verdict
Both QPUs have comparable 2Q gate fidelity (~99.50%). Rigetti Ankaa-3 offers more physical qubits (84 qubits).
Specification Comparison
| Metric | IQM Garnet | Rigetti Ankaa-3 |
|---|---|---|
| Physical Qubits | 20 | 84 ✓ |
| Technology | Superconducting | Superconducting |
| 2Q Gate Fidelity | 99.50% | 99.50% |
| 1Q Gate Fidelity | 99.94% ✓ | 99.90% |
| Readout Fidelity | 98.50% | 98.50% |
| Quantum Volume | 128 | 128 |
| CLOPS | 5,000 | 15,000 ✓ |
| T1 (Relaxation) | 150 µs ✓ | 80 µs |
| T2 (Dephasing) | 100 µs ✓ | 60 µs |
| 1Q Gate Time | 20 ns ✓ | 40 ns |
| 2Q Gate Time | 120 ns | 80 ns ✓ |
| Connectivity | Custom (deg 4) | Grid (deg 4) |
| Max Circuit Depth | 1,000 | 2,000 ✓ |
| Max Shots | 100,000 | 100,000 |
| Dynamic Circuits | No | No |
| Error Mitigation | Available | Available |
| Cloud Platforms | 2 platforms | 5 platforms |
Green bold values with a checkmark indicate the better result for each metric.
Pricing Comparison
Example: 10-qubit, 50-depth circuit, 1,000 shots — estimated cost on cheapest platform: IQM Garnet: $1.75 vs Rigetti Ankaa-3: $1.00
Superconducting IQM Garnet
| Platform | Price | Status |
|---|---|---|
| Best Amazon Braket | $0.001450/shot | Available |
| qBraid | $0.001450/shot | Available |
Superconducting Rigetti Ankaa-3
| Platform | Price | Status |
|---|---|---|
| Amazon Braket | $0.000900/shot | Available |
| Azure Quantum | $0.000970/shot | Available |
| Best Rigetti QCS | $0.000750/shot | Available |
| qBraid | $0.000900/shot | Available |
| Strangeworks | $0.000900/shot | Available |
Use Case Recommendations
More qubits (84 qubits) allows encoding larger problem instances.
Higher CLOPS (15,000) means faster circuit execution for high-repetition workloads.
Frequently Asked Questions
What is the difference between IQM Garnet and Rigetti Ankaa-3?
Both QPUs have comparable 2Q gate fidelity (~99.50%). Rigetti Ankaa-3 offers more physical qubits (84 qubits).
Which is better for quantum chemistry, IQM Garnet or Rigetti Ankaa-3?
For quantum chemistry simulations (VQE, UCCSD), IQM Garnet is preferred due to its higher 2Q gate fidelity (99.50% vs 99.50%). Higher gate fidelity directly reduces circuit error rates in chemistry algorithms.
How do the prices compare between IQM Garnet and Rigetti Ankaa-3?
IQM Garnet is available from $0.001450/shot on Amazon Braket. Rigetti Ankaa-3 is available from $0.000750/shot on Rigetti QCS. Note that pricing models differ — per-shot pricing is directly comparable while AQT and HQC models depend on circuit structure.
Which QPU has better connectivity, IQM Garnet or Rigetti Ankaa-3?
IQM Garnet uses Custom connectivity (degree 4) while Rigetti Ankaa-3 uses Grid connectivity (degree 4).
What are the coherence times for IQM Garnet vs Rigetti Ankaa-3?
IQM Garnet: T1=150 µs, T2=100 µs. Rigetti Ankaa-3: T1=80 µs, T2=60 µs. IQM Garnet has longer coherence times, which generally allows for deeper circuits before errors accumulate.
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