Thanks for the article. Nice read.
I presume Intel used the D1 fabrication facility for this ? They can further improve the performance of Tunnel Falls and integrate it into its full quantum stack with the Intel Quantum SDK.
Still a lot of catch up to do, since Intel's biggest rivals,
IBM, already offers multiple 127-qubit quantum computers for research and commercial use, with a 433-qubit machine up and running. 433, jeeze ? !
And the next logical step for Intel would be to create a 2D spin qubit device with the qubits arranged in a grid more like.
IMO, with Intel's expertise in material science and relationships with equipment vendors, allows them to leverage purified Silicon-28 isotope on their planar Si/SiGe heterostructure in the device as opposed to natural silicon which has a mixture of other isotopes including Silicon-29 and Silicon-30.
This won't make a HUGE impact though, but the advantage of Silicon-28, unlike the other isotopes, is that it has
zero nuclear spins. For quantum, this CAN make a big difference, because it enables a significant increase in coherence time which will decrease the error rates and improve the accuracy of the calculation.
That also suggests Intel is not yet ready to freeze a single prototype design for exploration by a wider software developer community. As with most qubit modalities, semiconductor-based spin qubits can be implemented in many ways.
As we all know, the barebones tech is being able to locate single electrons in isolated wells and to be able to control their spins so as to encode information in a quantum state (via recent
paper,
Quantum Dots/Spin Qubits).
But it turns out there are 3 more approaches to making silicon spin qubits, including the
Loss-DiVencenzo configuration, the
Single-Triplet (S-T0) configuration, and Exchange-only.