Entanglement of qubits is a process in which one qubit can be simultaneously given the same quantum properties. A qubit has two ground states “0” and “1”, but it can also be in states that are a superposition of these two ground states. This allows you to carry out some operations in a certain sense in parallel – that is, simultaneously with “0” and “1”.
The authors of the new work carried out their experiment on entangling qubits on a silicon structure using a composite structure of silicon and a silicon-germanium compound. Each of the structures had a qubit in the format of an ordinary electron.
The authors controlled the structures using aluminum gates, and the spin states of the electrons were changed thanks to a strong magnet on the crystal. As a result, the magnetic field, due to a drop in strength or gradient, separates the resonant frequencies of the three qubits: this is how we managed to address them separately.
If you confuse three qubits at once, you can speed up the calculations in the algorithms, as well as more quickly correct errors in quantum systems.
The authors of the new work note that the third qubit increases the reliability of the qubit calculations by up to 88%. The authors promise to bring their development up to 50 and even 100 qubits in the future and present more advanced error correction mechanisms.