A team of international researchers led by CQC²T Chief Investigator Prof Andrew Dzurak, have experimentally demonstrated a new type of two-qubit logic gate based on SiMOS qubit technology developed by the team at UNSW, which allows more complex multi-electron spin systems to act as qubits.

The research was published in Nature Communications.

The technological implications of this work are quite significant, since previous demonstrations have largely relied on qubits based on single electron wavefunctions, which can be easily distorted in a real CMOS device.  By moving to qubits containing more electrons the devices become more robust, and therefore more easily constructed using CMOS manufacturing.

“This latest work from our team shows that constructing a quantum computer chip based on silicon CMOS technology will be less challenging than we’d originally thought. Rather than having to operate qubit devices containing just one fragile electron, we can now operate with many electrons, making the engineering easier, while still allowing high fidelity quantum logic” says Prof Dzurak.

The CQC²T researchers included recently graduated PhD student, Ross Leon, supported in his experiments by Dr Henry Yang, and the detailed theoretical analysis behind this work was led by Dr Andre Saraiva.