【学术视频】The Kavli ITS workshop-Majorana Modes | 马里兰大学刘纯骁

图 | 刘纯骁

题   目：Protocol for reading out Majorana qubit and testing non-Abelian statistics on a 2D superconductor island

报告人：刘纯骁

单   位：University of Maryland

时   间：2019年1月8日-11日

地   点：University of Chinese Academy of Sciences

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报告摘要

The successful test of non-Abelianstatistics is not only a milestone in fundamental physics but also provides aquantum gate in topological quantum computation. An accurate and efficientreadout scheme of topological qubit is an essential step toward the experimentalconfirmation of non-Abelian statistics. In the current work, we propose ascheme to read out the quantum state of the Majorana qubit system in a Coulombblockaded topological superconductor. The protocol consists of four spatiallywell-separated Majorana zero modes trapped in vortex cores on thetwo-dimensional surface topological superconductor with charging energy.Projective measurement can be implemented by a pair of weakly coupled Majoranamodes in touch with two external metallic leads in the Coulomb blockade valley,while high resolution readout of the measurement outcome can be achieved byconductance measurement at charge degenerate points. Using this protocol, wecan further reveal the non-Abelian statistics of Majorana zero modes. Finally,we discuss how our proposal is able to distinguish Majorana zero modes fromCaroli-de Gennes-Matricon modes by observing the conductance at differentintervortex distance and temperature. 

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会议简介

The Kavli ITS workshop on “Majorana Modes in Topological Superconductors” was held at the Kavli Institute for Theoretical Sciences (Kavli ITS) at UCAS in Beijing from January 8-11, 2019. The workshop mainly focuses on the realization and application of elusive Majorana modes in topological superconductors.

Majorana particles, which are their own antiparticles, have been of considerable interest for quantum computing in solid state systems since the zero-bias peak of the conductance was observed in the semiconductor nanowires. Now there are multiple experimental hints to support the potential existence of the Majorana states possessing zero energy. Since Majorana states can form qubits for quantum computations, once the Majorana states are able to be fully controlled and manipulated, the number of the Majorana qubits can be scalable to accelerate the speed of the quantum computation.

The scope of this workshop is to discuss the recent topics in Majorana bound states and Chiral Majorana edge modes in class D, aiming at promoting new collaborations among participants and seeking practical implementations to use Majorana modes for quantum computation. Furthermore, in the workshop, there will be a discussion session focusing on Majorana physics in the vortices of the topological superconductors.

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