ABSTRACT
Topological materials provide a protection from decoherence at the hardware level by using emergent non-Abelian anyons. The simplest non-Abelian anyon involves a defect that binds a Majorana zero-energy mode predicted to appear quite naturally in certain superconducting systems. I will first review recent progresses and discuss the challenges in Majorana search. Then, I will discuss a near term question: What is the simplest way to reveal the coherent signatures of Majorana devices and measure the qubit lifetime? To answer this question, we propose a simple transport measurement in a Majorana Coulomb blockade device. Finally, I will discuss a serious type of error---diabatic error---in general topological quantum computation and Majorana qubits. Diabatic errors only vanish as a power-law function when increasing braiding operation time. This power-law behavior can wash out the advantages of topological quantum computation. We found a scheme to overcome this serious problem.
BIOGRAPHY
Dr. Dong E. Liu did his undergraduate study at Peking University. He got his PhD degree at Duke University in 2012, and then moved to the Michigan State University as a postdoc researcher. From 2014 to 2017, he worked for Microsoft Station Q as a postdoc researcher, and mostly focused on the theory of topological devices and topological quantum computation. He joined Tsinghua University in 2018 as an assistant professor.
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