Scientists from the University of New South Wales (UNSW) have announced another step in the race to develop the first quantum computer, touting the ability to build 3D atomic-scale quantum chips. The researchers from the Centre of Excellence for Quantum Computation and Communication Technology (CQC2T) at UNSW said they have demonstrated that atomic precision qubits can be built in a 3D device by using an atomic quantum bit (qubit) fabrication technique to multiply layers of a silicon crystal. Led by Professor Michelle Simmons, the researchers are the first to go public with the ability to demonstrate the feasibility of an architecture that uses atomic-scale qubits aligned to control lines -- which UNSW said are essentially very narrow wires -- inside a 3D design. Additionally, the team said it is able to align the different layers in their 3D device with nanometre precision, and also showed they can read out qubit states within one single measurement -- rather than having to rely on averaging out millions of experiments -- with very high fidelity. "This 3D device architecture is a significant advancement for atomic qubits in silicon. To be able to constantly correct for errors in quantum calculations -- an important milestone in our field -- you have to be able to control many qubits in parallel," Simmons said.
Jan-8-2019, 00:31:56 GMT