Scientists Demonstrate Teleportation Using On-Demand Photons

A group of scientists from Austria, Italy, and Sweden has successfully demonstrated teleportation using on-demand photons from quantum dots.

In a recently published paper in the journal Science Advances, the researchers explain how they accomplished this and how it applies to future quantum communications networks.

It is no surprise that scientists and many others are extremely interested in developing Quantum Communication Networks.

On-demand photon source and quantum teleportation setup.. Image Credit: Science Advances (2018). DOI: 10.1126/sciadv.aau1255
On-demand photon source and quantum teleportation setup. Image Credit: Science Advances (2018). DOI: 10.1126/sciadv.aau1255

Experts argue that such networks will be safe from piracy or illegal eavesdropping because of their very complicated nature.

But, as the researchers point out with this new effort, there are still some problems that get in the way.

One of them is the difficulty in amplifying quantum signals.

One way to solve this problem, they point out, is to generate photons as part of a quantum repeater, which helps to effectively handle high clock frequencies.

In this new effort, they have done just that, using semiconductor quantum dots.

Previous studies have tried the same approach. It has been proven that using semiconductor quantum dots is a feasible way to demonstrate teleportation, however, only under certain conditions, none of which seemed adequate for on-demand applications.

This is the main reason that they have not been recognized as a plug-and-play technology.

In the new study, scientists have managed to overcome the issue by developing quantum dots that were highly symmetrical, using an etching method to create the hole pairs in which the quantum dots develop.

As explained by, the process they used was called an XX (biexciton)–X (exciton) cascade. They then employed a dual-pulsed excitation scheme to populate the desired XX state (after two pairs shed photons, they retained their entanglement).

This allowed scientists to produce on-demand single photons that are suitable for use in teleportation.

As noted by, “The dual pulsed excitation scheme was critical to the process, the team notes, because it minimized re-excitation.”

Science Advances
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