IBM Eagle r3 vs Xanadu Borealis Specs, Pricing & Performance [2026]
Quick Verdict
IBM Eagle r3 uses Superconducting while Xanadu Borealis uses Photonic technology. Xanadu Borealis offers more physical qubits (216 qubits).
Specification Comparison
| Metric | IBM Eagle r3 | Xanadu Borealis |
|---|---|---|
| Physical Qubits | 127 | 216 ✓ |
| Technology | Superconducting | Photonic |
| 2Q Gate Fidelity | 99.50% ✓ | — |
| 1Q Gate Fidelity | 99.97% ✓ | — |
| Readout Fidelity | 99.80% ✓ | 98.00% |
| Quantum Volume | 128 ✓ | — |
| CLOPS | 2,500 ✓ | — |
| T1 (Relaxation) | 250 µs ✓ | — |
| T2 (Dephasing) | 150 µs ✓ | — |
| 1Q Gate Time | 60 ns ✓ | — |
| 2Q Gate Time | 660 ns ✓ | — |
| Connectivity | Heavy Hex (deg 3) | Linear (deg 2) |
| Max Circuit Depth | 4,000 ✓ | 10 |
| Max Shots | 100,000 | 100,000 |
| Dynamic Circuits | Yes | No |
| Error Mitigation | Available | No |
| 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 Xanadu Borealis: $0.5000
Superconducting IBM Eagle r3
| Platform | Price | Status |
|---|---|---|
| IBM Quantum | $0.9600/sec | Available |
| Best IBM Quantum | Free tier | Available |
| qBraid | $0.9600/sec | Available |
Photonic Xanadu Borealis
| Platform | Price | Status |
|---|---|---|
| Best Xanadu Cloud | $0.5000/task | Available |
| qBraid | $0.5000/task | Available |
Superconducting vs Photonic: Technology Tradeoffs
- Advantage
- Fast gate speeds (tens to hundreds of nanoseconds), mature fabrication technology using standard semiconductor processes, and strong industry investment make this the most commercially advanced platform.
- Challenge
- Requires dilution refrigerators operating near absolute zero (~15 mK), leading to large physical footprints and high infrastructure costs. Qubits are sensitive to noise, limiting coherence times to microseconds-to-milliseconds range.
- Gate Speed
- 10–700 ns per gate
- Fidelity
- 99.5–99.9% for 2-qubit gates
- Advantage
- Operates at room temperature (no cryogenics required), photons travel at the speed of light with minimal decoherence, and photonic hardware is compatible with existing fiber-optic telecommunications infrastructure for quantum networking.
- Challenge
- Deterministic photon-photon interactions are extremely difficult to engineer, making universal fault-tolerant quantum computation challenging. High photon loss rates and detector inefficiencies limit circuit depth. Current GBS machines are specialized rather than general-purpose.
- Gate Speed
- Picoseconds for passive operations; detector timing ~ns
- Fidelity
- Variable; loss-dominated; ~98% for single-photon detectors
Use Case Recommendations
Higher 2Q gate fidelity (99.50%) means fewer errors in VQE/UCCSD circuits.
More qubits (216 qubits) allows encoding larger problem instances.
Higher CLOPS (2,500) means faster circuit execution for high-repetition workloads.
Frequently Asked Questions
What is the difference between IBM Eagle r3 and Xanadu Borealis?
IBM Eagle r3 uses Superconducting while Xanadu Borealis uses Photonic technology. Xanadu Borealis offers more physical qubits (216 qubits). These QPUs use fundamentally different qubit technologies: Superconducting vs Photonic.
Which is better for quantum chemistry, IBM Eagle r3 or Xanadu Borealis?
For quantum chemistry, gate fidelity is the most critical metric. Compare the 2Q gate fidelity figures in the spec table above to determine which QPU is better suited for your chemistry workload.
How do the prices compare between IBM Eagle r3 and Xanadu Borealis?
IBM Eagle r3 is available from Free tier on IBM Quantum. Xanadu Borealis is available from $0.5000/task on Xanadu Cloud. 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 Xanadu Borealis?
IBM Eagle r3 uses Heavy Hex connectivity (degree 3) while Xanadu Borealis uses Linear connectivity (degree 2).
What are the coherence times for IBM Eagle r3 vs Xanadu Borealis?
IBM Eagle r3: T1=250 µs, T2=150 µs.
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