Charge qubits based on ultra-thin topological insulator films

IF 6.5 2区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Kexin Zhang, Hugo V. Lepage, Ying Dong, Crispin H. W. Barnes
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引用次数: 0

Abstract

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 \(\sqrt {{\rm{SWAP}}} \) 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.

Abstract Image

基于超薄拓扑绝缘体薄膜的电荷量子比特
我们研究了如何利用 Bi2Se3 拓扑绝缘体超薄薄膜中受有限尺寸效应影响的表面态来实现量子计算的目的。我们证明了(i) 受有限尺寸效应影响的表面态可以有效地形成一个两级系统,其能级位于体能隙之间,从而可以构建一个逻辑量子比特,(ii) 可以使用简单形式的电脉冲初始化和操纵量子比特、(iii) 当两个量子比特处于并行设置时,可以通过 \(\sqrt {{rm{SWAP}} \) 操作实现两个量子比特的纠缠;以及 (iv) 或者,可以利用 Floquet 状态来构建量子比特,并通过受控-非受控操作实现两个 Floquet 量子比特的纠缠。由于始终存在一个振荡电场,而且单量子比特操作是由振荡场的振幅调制控制的,这在实验上非常方便。
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来源期刊
Frontiers of Physics
Frontiers of Physics PHYSICS, MULTIDISCIPLINARY-
CiteScore
9.20
自引率
9.30%
发文量
898
审稿时长
6-12 weeks
期刊介绍: Frontiers of Physics is an international peer-reviewed journal dedicated to showcasing the latest advancements and significant progress in various research areas within the field of physics. The journal's scope is broad, covering a range of topics that include: Quantum computation and quantum information Atomic, molecular, and optical physics Condensed matter physics, material sciences, and interdisciplinary research Particle, nuclear physics, astrophysics, and cosmology The journal's mission is to highlight frontier achievements, hot topics, and cross-disciplinary points in physics, facilitating communication and idea exchange among physicists both in China and internationally. It serves as a platform for researchers to share their findings and insights, fostering collaboration and innovation across different areas of physics.
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