A quantum logic gate for free electrons
arXiv:2209.07123 · doi:10.22331/q-2023-07-11-1050
Abstract
The topological charge of vortex electrons spans an infinite-dimensional Hilbert space. Selecting a two-dimensional subspace spanned by , 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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