Tallennettuna:
| Päätekijä: | |
|---|---|
| Aineistotyyppi: | Recurso digital |
| Kieli: | |
| Julkaistu: |
Zenodo
2026
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| Aiheet: | |
| Linkit: | https://doi.org/10.5281/zenodo.19207576 |
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Sisällysluettelo:
- <p>The nitrogen-vacancy (NV) centre in diamond is the only solid-state qubit that operates at room temperature, yet its viability for fault-tolerant quantum computing has been dismissed on the grounds that decoherence times are too short. Here we show, through a calibrated nine-channel decoherence model spanning 1.3 K to 600 K (13 experimental anchors, R² = 0.953), that single- and two-qubit gate error rates fall below the surface code threshold of 1% at 295 K for bulk ultra-pure diamond under dynamical decoupling with N ≥ 2048 pi-pulses. The key enabler is the recently demonstrated T₂ = 2T₁ limit (4.34 ms at room temperature), achieved by filtering the spin-lattice Han noise channel above 1 MHz via high-order CPMG. For standard-grade bulk diamond, we identify a Peltier-cooled sweet spot at 200–270 K that brings all gates below threshold at a cooling cost of ~200 EUR — four orders of magnitude cheaper than a dilution refrigerator. Robust DD protocols (KDD, XY-8) extend the practical pulse number by 10–30x over CPMG, enabling T₂ approaching 2T₁ even with imperfect pulses. We find that decoherence is no longer the bottleneck for NV-based quantum computing at room temperature. The remaining barriers are qubit count, connectivity, and readout speed — all engineering challenges, not physics ones. UK Patent Application GB2606382.6 (24 March 2026) covers methods and products described herein.</p>