Another record has been broken on the way to fully operational and capable quantum computers: the complete control of a 6-qubit quantum processor in silicon.
By making careful improvements to the way the electrons were prepared, managed, and monitored, the team was able to successfully control their spin – the quantum mechanical property that enables the qubit state.
The researchers were also able to create logic gates and entangle systems of two or three electrons, on demand, with low error rates.to control and read electron spin, operating them as qubits, and getting them to interact with each other as required. "In this research, we push the envelope of the number of qubits in silicon, and achieve high initialization fidelities, high readout fidelities, high single-qubit gate fidelities, and high two-qubit state fidelities,""What really stands out though is that we demonstrate all these characteristics together in one single experiment on a record number of qubits.
The advantage of silicon is that the manufacturing and supply chains are all already in place, meaning the transition from a scientific laboratory to an actual machine should be more straightforward. Work continues to keep pushing the qubit record even higher. "With careful engineering, it is possible to increase the silicon spin qubit count while keeping the same precision as for single qubits,""The key building block developed in this research could be used to add even more qubits in the next iterations of study."
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