硅量子点电控制

A UNSW-led research team has encoded quantum information in silicon ¹ using simple electrical pulses for the first time, bringing the construction of affordable ² large-scale quantum computers one step closer to reality. Lead researcher, UNSW Associate Professor Andrea Morello from the School of Electrical Engineering and Telecommunications, said his team had successfully realised a new control method for future quantum computers., ,The findings were published today in the open-access journal Science Advances., ,Unlike conventional computers that store data on transistors ³ and hard drives, quantum computers encode data in the quantum states of microscopic ⁴ objects called qubits., ,The UNSW team, which is affiliated ⁵ with the ARC Centre of Excellence ⁶ for Quantum Computation & Communication Technology, was first in the world to demonstrate single-atom spin qubits in silicon, reported in Nature in 2012 and 2013., ,The team has already improved the control of these qubits to an accuracy of above 99% and established the world record for how long quantum information can be stored in the solid state, as published in Nature Nanotechnology in 2014., ,It has now demonstrated a key step that had remained elusive ⁷ since 1998., ,"We demonstrated that a highly coherent qubit, like the spin of a single phosphorus atom in isotopically ⁸ enriched silicon, can be controlled using electric fields, instead of using pulses of oscillating magnetic fields," explained UNSW's Dr Arne Laucht, post-doctoral researcher and lead author of the study.