Modeling Longer-Lived Holes in Silicon Quantum Dots To Advance the Development of Quantum Computers RIKEN physicists have developed a theoretical model to optimize semiconductor nanodevices, demonstrating that carefully designed quantum dots can create robust silicon hole-spin qubits resistant to e
Figure 1: Illustration of a qubit in a silicon quantum dot. Optimizing the size, shape, and geometry of a quantum dot leads to longer-lived hole spins. Credit: © Tony MelovRIKEN physicists have developed a theoretical model to optimize semiconductor nanodevices, demonstrating that carefully designed quantum dots can create robust silicon hole-spin qubits resistant to electric noise. This research is crucial for understanding dephasing and designing large-scale quantum computers.
Peter Stano and two colleagues have developed a theoretical model for optimizing the design of silicon quantum-dot-based spin qubits. Credit: © 2023 RIKEN This inevitable decay, or dephasing, is a fundamental limit and a major difference to classical information, which can be made permanent. Understanding dephasing is vital for developing methods to mitigate it, and thus aiding the design of large-scale quantum computers.
“Our results show that by carefully designing a quantum dot and by placing the electric and magnetic fields in certain ways we can find sweet spots at which the silicon hole-spin qubits are remarkably robust against electric noise,” says Stano.
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