Charge qubits based on ultra-thin topological insulator films  

作　　者：Kexin Zhang Hugo V.Lepage Ying Dong Crispin H.W.Barnes 

机构地区：[1]Research Center for Quantum Sensing,Intelligent Perception Research Institute,Zhejiang Lab,Hangzhou 311121,China [2]Cavendish Laboratory,Department of Physics,University of Cambridge,Cambridge CB30HE,United Kingdom

出　　处：《Frontiers of physics》2024年第3期71-81,共11页物理学前沿（英文版）

摘　　要：We study how to use the surface states in a Bi2Se3 topological insulator ultra-thin film that are affected by finite size effects for the purpose of quantum computing.We demonstrate that:(i)surface states under the finite size effect can effectively form a two-level system where their energy levels lie in between the bulk energy gap and a logic qubit can be constructed,(ii)the qubit can be initialized and manipulated using electric pulses of simple forms,(iii)two-qubit entanglement is achieved through a√SWAP operation when the two qubits are in a parallel setup,and(iv)alternatively,a Floquet state can be exploited to construct a qubit and two Floquet qubits can be entangled through a Controlled-NOT operation.The Floquet qubit offers robustness to background noise since there is always an oscillating electric field applied,and the single qubit operations are controlled by amplitude modulation of the oscillating field,which is convenient experimentally.

关 键 词：topological insulator quantum computing NANODEVICES 

分 类 号：O41[理学—理论物理]