双路石墨烯干涉仪中的电子碰撞

IF 44.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2025-05-01

H. Chakraborti, L. Pugliese, A. Assouline, K. Watanabe, T. Taniguchi, N. Kumada, D. C. Glattli, M. Jo, H.-S. Sim, P. Roulleau

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引用次数: 0

摘要

两个电子在分束器上的碰撞为研究它们的相干性和不可区分性提供了一种方法。它的实现需要单电子的按需生成和同步。在这项工作中，我们展示了由电压脉冲产生的单电子在石墨烯马赫-曾德干涉仪中的相干碰撞。通过测量碰撞产生的散粒噪声，我们揭示了碰撞电子的基本特征，突出了它们波函数中不可区分部分和可区分部分之间的互补性。前者通过费米子Hong-Ou-Mandel相消干涉表现出来，后者通过噪声中的双绕组Aharonov-Bohm相消干涉表现出来。60%左右的干涉可见度使全面的量子态层析成像成为可能。我们的发现可能使涉及飞行量子比特的相干操作在石墨烯中触手可及。

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Electron collision in a two-path graphene interferometer

The collision of two electrons at a beam splitter provides a method for studying their coherence and indistinguishability. Its realization requires the on-demand generation and synchronization of single electrons. In this work, we demonstrate the coherent collision of single electrons, generated by voltage pulses, in a graphene Mach-Zehnder interferometer. By measuring shot noise resulting from the collisions, we unveil fundamental characteristics of colliding electrons, highlighting the complementarity between the indistinguishable and distinguishable parts of their wave functions. The former is manifested through fermionic Hong-Ou-Mandel destructive interference, whereas the latter is discerned through double-winding Aharonov-Bohm interference in the noise. The interference visibilities of around 60% enable comprehensive quantum state tomography. Our findings may place coherent operations involving flying qubits within reach in graphene.

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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