Quantum hardware developer SAXON Q and the Fraunhofer Institute for Machine Tools and Forming Technology (IWU) have published results demonstrating a three-qubit Grover search algorithm executed on a commercial room-temperature quantum computer. Detailed in a pre-print research paper, the experiment achieved an algorithm success probability that surpasses previous room-temperature quantum searches and rivals benchmarks set by cryogenic superconducting processors.
The benchmark was conducted on a commercial nitrogen-vacancy (NV) center diamond quantum computer installed on-site at Fraunhofer IWU in Dresden. Operating under ambient conditions at an average temperature of 296.3 Kelvin (23.1°C), the system required no cryostats, optical traps, or vacuum chambers, drawing approximately 600 watts of continuous power.
| [ 3-Qubit Grover Search Performance & Hardware Benchmarks ] | |||
|---|---|---|---|
| Search Parameter | SAXON Q Success Rate (NV-Center) | Classical Limit | Cryogenic / Other Baselines |
| • 1 Marked State (N = 8, r = 2) | • (77.3 ± 3.4)% Average ASP | • 37.5% Maximum | • Superconducting: 49.2%–78.0% • Trapped Ions: 43.7%–69.0% |
| • 2 Marked States (N = 8, r = 1) | • (87.0 ± 4.2)% Average ASP | • 46.4% Maximum | • Silicon Spin Qubits: 89.4% (at 15 mK with post-selection) |
| • Operating Environment | • 296.3 K (Ambient Air, ~600 W) | • N/A | • Dilution Refrigerators (< 20 mK, 25+ kW) |
| • Single-Qubit Gate Fidelity | • 99.90% Average Clifford (up to 99.98%) | • N/A | • Evaluated via Randomized Benchmarking (RB) |
| • Multi-Qubit Subspace Fidelity | • 95.7% Average (Phase000 Gate) | • N/A | • Evaluated via Interleaved RB |
The calculation register was constructed entirely from solid-state nuclear spins rather than electron spins: the intrinsic nitrogen-14 nucleus and two nearby carbon-13 nuclei within the diamond lattice. Shielded by the surrounding carbon matrix, these nuclear spin qubits exhibit coherence times (T2) of 1.4 to 4.3 milliseconds—roughly 1,000 times longer than the NV center’s electronic spin, which is utilized strictly as an optical interface for initialization, entangling operations, and readout.
The algorithmic demonstration complements SAXON Q’s broader commercial hardware roadmap, following its recent commercial availability of the 128-qubit SXQ128 and 512-qubit SXQ512 modular multi-core systems.
Review the full technical research paper on arXiv here and examine the corporate press announcement via the SAXON Q Newsroom here.
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