Originally published on LinkedIn
Dec 23, 2024 | Charles Tahan
This is an archived copy of a LinkedIn post. The original is at the link above.
One of the original motivations for considering spins in silicon for quantum computing was experiments from the 1960’s showing incredible spin lifetimes event at 2 Kelvin and above. That’s “hot” for solid-state qubits which usually operate at dilution refrigerator temperatures, or ~50-100 milli-Kelvin. In the last few years several groups have shown that even two-qubit gate operations — which are typically much more sensitive to noise sources — can operate at elevated temperatures, at least up to ~99% fidelity levels.
We wanted to start looking at what the fundamental limits to two-qubit gate performance in spin qubits may be as a function of temperature. The paper just published below is just a first step, but our results show that at least for phonon-caused infidelities on the exchange interaction there are still more “nines” of fidelity that should be achievable.