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Scientists Use Laser Light to Modulate Free Electrons into Qubits

The laws of quantum physics are not only extraordinary – they also offer some far-reaching and unique possibilities for advanced information processing, quantum computing and cryptography. So far, the basic building blocks for such quantum operations are electric circuitry in form of superconducting resonators, light in form of photons or atoms in form of ion chains. However, all these quantum systems have their drawbacks, and scientists are therefore continuously searching for useful alternatives.

In their recent publication in Physical Review Research, scientists from the Department of Physics at the University of Konstanz have found a way to modulate a free electron in vacuum into a so-called qubit, a two-level quantum bit. Such qubits are the building blocks of information processing in quantum computers.

To generate their free-electron qubits, the researchers use the electron beam of a transmission electron microscope and intersect it with the electric field of classical laser light. "The resulting matter-wave interferences create a periodic modulation of the electron energy into discrete, well-defined energy levels, which we use as a resource for the formation of qubits", explains Professor Peter Baum, the leader of the research team.

Read more about how this works and about the additional value of the experiment's results for high-resolution electron microscopy in our extended article in the online magazine campus.kn


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