Scientists at CQC2T, UNSW, Australia create the quietest semiconductor quantum bits on record

November 3rd, 2020

We are ecstatic to share this most recent result by Prof. Michelle Simmons and team at the Centre for Quantum Computation and Communication Technology (CQC2T) based at the University of New South Wales in Sydney Australia. The CQC2T team has taken another important step forward in the development of a silicon quantum computer by demonstrating the lowest noise level on record for a semiconductor quantum bit, or qubit.

For quantum computers to perform useful calculations, quantum information must be close to 100 per cent accurate. Charge noise – caused by imperfections in the material environment that hosts qubits – interferes with quantum information encoded on qubits, impacting the accuracy of the information. “The level of charge noise in semiconductor qubits has been a critical obstacle to achieving the accuracy levels we need for large-scale error-corrected quantum computers,” says lead author Ludwik Kranz, a PhD student at CQC²T’s spin off company Silicon Quantum Computing (SQC). “Our research has demonstrated that we can reduce charge noise to a significantly low level, minimising the impact it has on our qubits,” says Kranz. “By optimising the fabrication process of the silicon chip, we achieved a noise level 10 times lower than previously recorded. This is the lowest recorded charge noise of any semiconductor qubit.”

“Our results continue to show that silicon is a terrific material to host qubits. With our ability to engineer every aspect of the qubit environment, we are systematically proving that atom qubits in silicon are reproducible, fast and stable,” says Prof Michelle Simmons, Director CQC²T.

Scienta Omicron is proud that our products are facilitating research at the Centre for Quantum Computation and Communication Technology (or CQC²T) at UNSW Sydney. Our VT SPM product installed in 2016 was used in the ‘Exploiting a single-crystal environment to minimise the charge noise on Qubits in Silicon’ and another fascinating paper ‘Single-Shot Spin Readout in Semiconductors Near the Shot-Noise Sensitivity Limit’ used a VT SPM that we installed in 1998.

Read more about the creating the quietest semiconductor quantum bits on record here: Silence Please UNSW Scientists Create Quiestest Semiconductor Quantum Bits on Record