IBM Eagle r3 vs IQM Garnet Specs, Pricing & Performance [2026]
Quick Verdict
Both QPUs have comparable 2Q gate fidelity (~99.50%). IBM Eagle r3 offers more physical qubits (127 qubits).
Specification Comparison
| Metric | IBM Eagle r3 | IQM Garnet |
|---|---|---|
| Physical Qubits | 127 ✓ | 20 |
| Technology | Superconducting | Superconducting |
| 2Q Gate Fidelity | 99.50% | 99.50% |
| 1Q Gate Fidelity | 99.97% ✓ | 99.94% |
| Readout Fidelity | 99.80% ✓ | 98.50% |
| Quantum Volume | 128 | 128 |
| CLOPS | 2,500 | 5,000 ✓ |
| T1 (Relaxation) | 250 µs ✓ | 150 µs |
| T2 (Dephasing) | 150 µs ✓ | 100 µs |
| 1Q Gate Time | 60 ns | 20 ns ✓ |
| 2Q Gate Time | 660 ns | 120 ns ✓ |
| Connectivity | Heavy Hex (deg 3) | Custom (deg 4) |
| Max Circuit Depth | 4,000 ✓ | 1,000 |
| Max Shots | 100,000 | 100,000 |
| Dynamic Circuits | Yes | No |
| Error Mitigation | Available | Available |
| Cloud Platforms | 3 platforms | 2 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: IBM Eagle r3: $0.00 vs IQM Garnet: $1.75
Superconducting IBM Eagle r3
| Platform | Price | Status |
|---|---|---|
| IBM Quantum | $0.9600/sec | Available |
| Best IBM Quantum | Free tier | Available |
| qBraid | $0.9600/sec | Available |
Superconducting IQM Garnet
| Platform | Price | Status |
|---|---|---|
| Best Amazon Braket | $0.001450/shot | Available |
| qBraid | $0.001450/shot | Available |
Use Case Recommendations
More qubits (127 qubits) allows encoding larger problem instances.
Higher CLOPS (5,000) means faster circuit execution for high-repetition workloads.
Frequently Asked Questions
What is the difference between IBM Eagle r3 and IQM Garnet?
Both QPUs have comparable 2Q gate fidelity (~99.50%). IBM Eagle r3 offers more physical qubits (127 qubits).
Which is better for quantum chemistry, IBM Eagle r3 or IQM Garnet?
For quantum chemistry simulations (VQE, UCCSD), IBM Eagle r3 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 IBM Eagle r3 and IQM Garnet?
IBM Eagle r3 is available from Free tier on IBM Quantum. IQM Garnet is available from $0.001450/shot on Amazon Braket. 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, IBM Eagle r3 or IQM Garnet?
IBM Eagle r3 uses Heavy Hex connectivity (degree 3) while IQM Garnet uses Custom connectivity (degree 4).
What are the coherence times for IBM Eagle r3 vs IQM Garnet?
IBM Eagle r3: T1=250 µs, T2=150 µs. IQM Garnet: T1=150 µs, T2=100 µs. IBM Eagle r3 has longer coherence times, which generally allows for deeper circuits before errors accumulate.
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