Google Willow vs Rigetti Ankaa-3 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 | Rigetti Ankaa-3 |
|---|---|---|
| Physical Qubits | 105 ✓ | 84 |
| Technology | Superconducting | Superconducting |
| 2Q Gate Fidelity | 99.88% ✓ | 99.50% |
| 1Q Gate Fidelity | 99.97% ✓ | 99.90% |
| Readout Fidelity | 99.90% ✓ | 98.50% |
| Quantum Volume | — | 128 ✓ |
| CLOPS | 100,000 ✓ | 15,000 |
| T1 (Relaxation) | 100 µs ✓ | 80 µs |
| T2 (Dephasing) | 80 µs ✓ | 60 µs |
| 1Q Gate Time | 25 ns ✓ | 40 ns |
| 2Q Gate Time | 68 ns ✓ | 80 ns |
| Connectivity | Grid (deg 4) | Grid (deg 4) |
| Max Circuit Depth | 1,000 | 2,000 ✓ |
| Max Shots | 1,000,000 ✓ | 100,000 |
| Dynamic Circuits | No | No |
| Error Mitigation | Available | Available |
| Cloud Platforms | 0 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: Google Willow: N/A vs Rigetti Ankaa-3: $1.00
Superconducting Google Willow
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
Higher 2Q gate fidelity (99.88%) means fewer errors in VQE/UCCSD circuits.
More qubits (105 qubits) allows encoding larger problem instances.
Higher CLOPS (100,000) means faster circuit execution for high-repetition workloads.
Frequently Asked Questions
What is the difference between Google Willow and Rigetti Ankaa-3?
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 Rigetti Ankaa-3?
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 Rigetti Ankaa-3?
Google Willow is available from no public cloud access. 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, Google Willow or Rigetti Ankaa-3?
Both Google Willow and Rigetti Ankaa-3 use Grid connectivity. The effective connectivity degree is 4 for Google Willow and 4 for Rigetti Ankaa-3.
What are the coherence times for Google Willow vs Rigetti Ankaa-3?
Google Willow: T1=100 µs, T2=80 µs. Rigetti Ankaa-3: T1=80 µs, T2=60 µs. Google Willow has longer coherence times, which generally allows for deeper circuits before errors accumulate.
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