'Transparent' iron brings quantum light computer closer to reality

Scientists have for the first time succeeded in making atomic nuclei transparent with the help of X-ray light.

At the same time the team of DESY scientists headed by Dr. Ralf Rohlsberger have also discovered a new way to realize an optically controlled light switch that can be used to manipulate light with light, an important ingredient for efficient future quantum computers.

The effect of electromagnetically induced transparency (EIT) is well known from laser physics. With intense laser light of a certain wavelength it is possible to make a non-transparent material transparent for light of another wavelength.

This effect is generated by a complex interaction of light with the atomic electron shell.

At DESY's X-ray source PETRA III, the Helmholtz research team of Rohlsberger managed to prove for the first time that this transparency effect also exists for X-ray light, when the X-rays are directed towards atomic nuclei of the Mossbauer isotope iron-57 (which makes up 2percent of naturally occurring iron).

Quite remarkably, only very low light intensities are needed to observe this effect, in contrast to standard EIT experiments.

In order to achieve this, the scientists positioned two thin layers of iron-57 atoms in an optical cavity, an arrangement of two parallel platinum mirrors that reflect X-ray light multiple times.

The two layers of iron-57 atoms, each approximately three nanometres thick, are precisely kept in position between the two platinum mirrors by carbon, which is transparent for X-ray light of the wavelength used. This kind of sandwich with a total thickness of only 50 nanometres is irradiated under very shallow angles with an extremely thin X-ray beam from the PETRA III synchrotron light source.

Within this mirror system, the light is reflected back and forth several times, generating a standing wave, a so-called resonance. When the light wavelength and the distance between both iron layers are just right in proportion, the scientists can see that the iron becomes almost transparent for the X-ray light.

In order for this effect to occur, one iron layer must be located exactly in the minimum (node) of the light resonance, the other one exactly in the maximum. When the layers are shifted within the cavity, the system immediately becomes non-transparent.

The scientists attribute this observation to a quantum-optical effect, caused by the interaction of atoms in the iron layers. Unlike single atoms, the atoms in an optical cavity together absorb and radiate in synchrony. In the geometry of this experiment their oscillations mutually cancel each other, as a result of which the system appears to be transparent.

In contrast to previous experiments in the optical regime, only few light quanta are necessary to generate this effect.

"Our result of achieving transparency of atomic nuclei is virtually the EIT effect in the atomic nucleus," Rohlsberger described the experiments.

"Undoubtedly, there is still a long way to go until the first quantum light computer becomes reality. However, with this effect, we are able to perform a completely new class of quantum-optical experiments of highest sensitivity. With the European XFEL X-ray laser, currently being built in Hamburg, there is a real chance to control X-ray light with X-ray light," he stated.

The research results are presented in the current edition of the scientific journal Nature. (ANI)