A quantum logic gate for free electrons

• URL: http://arxiv.org/abs/2209.07123v2
• Date: Fri, 30 Jun 2023 14:49:59 GMT
• Title: A quantum logic gate for free electrons
• Authors: Stefan L\"offler, Thomas Schachinger, Peter Hartel, Peng-Han Lu, Rafal E. Dunin-Borkowski, Martin Obermair, Manuel Dries, Dagmar Gerthsen, Peter Schattschneider
• Abstract summary: A beam electron in a transmission electron microscope can be considered as a quantum bit (qubit) freely propagating in the column. We set up a TEM probe forming lens system as a quantum gate and demonstrate its action numerically and experimentally. High-end TEMs with aberration correctors are a promising platform for such experiments, opening the way to study quantum logic gates in the electron microscope.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The topological charge $m$ of vortex electrons spans an infinite-dimensional Hilbert space. Selecting a two-dimensional subspace spanned by $m=\pm 1$, a beam electron in a transmission electron microscope (TEM) can be considered as a quantum bit (qubit) freely propagating in the column. A combination of electron optical quadrupole lenses can serve as a universal device to manipulate such qubits at the experimenter's discretion. We set up a TEM probe forming lens system as a quantum gate and demonstrate its action numerically and experimentally. High-end TEMs with aberration correctors are a promising platform for such experiments, opening the way to study quantum logic gates in the electron microscope.

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