Scientists create the quietest semiconductor quantum bits

For quantum computers to perform useful computations, quantum information must have

accuracy close to 100%. Charging noise caused by the imperfection of the material environment in which the qubits are located interferes with the quantum information encoded on them, affecting the accuracy of the information. Scientists have figured out how to solve the problem by optimizing the process of making a silicon chip

"The level of charge noise in semiconductorqubits have been a major obstacle to achieving the levels of precision we need for large-scale quantum computers, ”explains the study's lead author, Ludwik Kranz, Ph.D. and student at UNSW's Center for Quantum Computing and Communication Technologies.

“Our research has shown that we canreduce charge noise to a significantly low level while minimizing its effect on our qubits, ”said Krantz. “By optimizing the silicon chip manufacturing process, we achieved a noise level 10 times lower than previously recorded. This is the lowest recorded charge noise of any semiconductor qubit. "

Qubits made from electrons placed onatomic qubits in silicon are a promising platform for large-scale quantum computers. However, qubits placed on any semiconductor platform like silicon are sensitive to charge noise. The team's research showed that the presence of defects inside the silicon chip or at the interface with the surface contributes significantly to charge noise. By reducing the amount of impurities in the silicon chip and placing atoms away from surfaces and interfaces where most of the noise occurs, the team was able to achieve a record result.

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