• March 2020
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Scientists Succeed in Measuring Electron Spin Qubit Without Demolishing It RIKEN

March 3, 2020

Scientists at the RIKEN Center for Emergent Matter Science in Japan have successfully measured electron spin in a silicon quantum dot (QD) without altering its spin. Such measurements have been difficult, as spin typically is impacted by the process of reading out single electron spins in silicon, which is to convert the spins into charges for fast detection. The researchers used the Ising model to transfer spin data of an electron in a QD to an electron in a neighboring QD; they then were able to measure the neighbor’s spin while leaving the original electron untouched. Using this method, said RIKEN’s Seigo Tarucha, yielded a non-demolition fidelity rate of 99%, a readout accuracy of 95%, and a theoretical accuracy upgrade to 99.6%.

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