Google Willow vs IQM Garnet Specs, Pricing & Performance [2026]
Quick Verdict
Google Willow leads on 2Q gate fidelity (99.88%). Google Willow offers more physical qubits (105 qubits).
Specification Comparison
| Metric | Google Willow | IQM Garnet |
|---|---|---|
| Physical Qubits | 105 ✓ | 20 |
| Technology | Superconducting | Superconducting |
| 2Q Gate Fidelity | 99.88% ✓ | 99.50% |
| 1Q Gate Fidelity | 99.97% ✓ | 99.94% |
| Readout Fidelity | 99.90% ✓ | 98.50% |
| Quantum Volume | — | 128 ✓ |
| CLOPS | 100,000 ✓ | 5,000 |
| T1 (Relaxation) | 100 µs | 150 µs ✓ |
| T2 (Dephasing) | 80 µs | 100 µs ✓ |
| 1Q Gate Time | 25 ns | 20 ns ✓ |
| 2Q Gate Time | 68 ns ✓ | 120 ns |
| Connectivity | Grid (deg 4) | Custom (deg 4) |
| Max Circuit Depth | 1,000 | 1,000 |
| Max Shots | 1,000,000 ✓ | 100,000 |
| Dynamic Circuits | No | No |
| Error Mitigation | Available | Available |
| Cloud Platforms | 0 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: Google Willow: N/A vs IQM Garnet: $1.75
Superconducting Google Willow
Superconducting IQM Garnet
| Platform | Price | Status |
|---|---|---|
| Best Amazon Braket | $0.001450/shot | Available |
| qBraid | $0.001450/shot | Available |
Use Case Recommendations
Higher 2Q gate fidelity (99.88%) means fewer errors in VQE/UCCSD circuits.
More qubits (105 qubits) allows encoding larger problem instances.
Frequently Asked Questions
What is the difference between Google Willow and IQM Garnet?
Google Willow leads on 2Q gate fidelity (99.88%). Google Willow offers more physical qubits (105 qubits).
Which is better for quantum chemistry, Google Willow or IQM Garnet?
For quantum chemistry simulations (VQE, UCCSD), Google Willow is preferred due to its higher 2Q gate fidelity (99.88% vs 99.50%). Higher gate fidelity directly reduces circuit error rates in chemistry algorithms.
How do the prices compare between Google Willow and IQM Garnet?
Google Willow is available from no public cloud access. 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, Google Willow or IQM Garnet?
Google Willow uses Grid connectivity (degree 4) while IQM Garnet uses Custom connectivity (degree 4).
What are the coherence times for Google Willow vs IQM Garnet?
Google Willow: T1=100 µs, T2=80 µs. IQM Garnet: T1=150 µs, T2=100 µs. IQM Garnet has longer coherence times, which generally allows for deeper circuits before errors accumulate.
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