New viable means of storing information for quantum technologies?

In a study published on 3 August 2021 in Physical Review X, an international research team consisting of CNRS researcher Fabio Pistolesi¹ and two foreign researchers used theoretical calculations to show that it is possible to realize a new type of qubit, in which information is stored in the oscillation amplitude of a carbon nanotube. These nanotubes can perform a large number of oscillations without diminishing, which shows their low level of interaction with the environment, and makes them excellent potential qubits. This property would enable for greater reliability in quantum computation.

A problem nevertheless persists with regard to the reading and writing of information stored in the first two energy levels² of these oscillators. Scientists successfully proved that this information could be read by using the coupling between electrons, a negatively charged particle, and the flexural mode of these nanotubes.

This changes the spacing between the first levels of energy enough to make them accessible independently from other levels, thereby making it possible to read the information they contain. These promising theoretical predictions have not yet been verified experimentally.

Notes

1 -- Researcher at the Laboratoire ondes et matières d'Aquitaine (CNRS/Université de Bordeaux). He worked with a scientist from the University of Chicago (United States) and from the Institute of Photonic Sciences in Barcelona (Spain).

2 -- The level of energy is a quantity that can describe systems in physics, with a level corresponding to a "state" of the system.