Silicon Quantum Computing

SQC Scientists develop a better way to measure qubits

September 8. 2022

SQC Scientists develop a better way to measure qubits

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Leading Australian quantum computing hardware company takes another significant step toward useful quantum computing

7 September 2022 – SYDNEY, AUSTRALIA – Silicon Quantum Computing (SQC) scientists have taken another significant step toward general purpose quantum computing. As published today in Science Advances, SQC scientists have developed a new method that makes the critical Readout stage of a quantum calculation faster, easier and less prone to interference.

The Readout stage is the third critical step in the process a quantum computer takes to solve a problem. There are three stages:


  1. The Setup – “Initialisation stage” sets up the device in a precise state ready for encoding the problem into the computer.


  1. The Calculation – “Control stage” when the qubits interact, and the calculation happens.


  1. The Result – “Readout stage” requires carefully measuring the final states of the qubits to determine the result or answer to the computation. This final stage needs to be fast, accurate and robust so that the result encoded in the qubit does not drift and become erroneous.


Qubits are extremely sensitive to their environment, and environmental noise can interfere with their measurement.

Traditionally when measuring qubit spin states, measurement is based on whether a constant electrical signal changes or not.

In SQC’s new protocol, the electrical signal is a ramp, and the measurement relies on when the signal changes. By using a variable voltage ramp, the Readout is now robust against environmental noise with the need for time-consuming calibration removed.

This result further demonstrates SQC’s focus and progress along its technical roadmap towards an error-corrected quantum computer.

A detailed research paper has been published in Science Advances on 7 September, which can be accessed via the link below.


Ramped measurement technique for robust high-fidelity spin qubit readout


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Media Contacts

Espresso Communications for SQC
Natasha David
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