Researchers Demonstrate Quantum Teleportation Between Distant Material Objects

Researchers Teleport Information Between Two Clouds of Gas Atoms

Professor Eugene Polzik in the quantum optics laboratory with the experiment setup in the background. Credit: Niels Bohr Institute

In a newly published study, researchers from the Niels Bohr Institute demonstrate the deterministic continuous-variable quantum teleportation of information between two clouds of gas atoms.

Researchers have been able to teleport information from light to light at a quantum level for several years. In 2006, researchers at the Niels Bohr Institute succeeded in teleporting between light and gas atoms. Now the research group has succeeded in teleporting information between two clouds of gas atoms and carrying out the teleportation – not just one or a few times, but successfully every single time. The results are published in the scientific journal, Nature Physics.

“It is a very important step for quantum information research to have achieved such stable results that every attempt will succeed,” says Eugene Polzik, professor and head of the research center Quantop at the Niels Bohr Institute at the University of Copenhagen.

The experiments are conducted in the laboratories of the research group in the basement under the Niels Bohr Institute. There are two glass containers, each containing a cloud of billions of caesium gas atoms.

The two glass containers are not connected to each other, but information is teleported from one glass cloud to the other by means of laser light. The light is sent into the first glass container and then that strange quantum phenomenon takes place, the light and gas become entangled. The fact that they are entangled means that they have established a quantum link – they are synchronized.

Quantum Teleportation Between Atomic Systems

There are two glass containers, each containing a cloud of billions of caesium gas atoms. Both glass containers are enclosed in a chamber with a magnetic field. The two glass containers are not connected to each other, but information is teleported from one glass cloud to the other by means of laser light. Credit: Niels Bohr Institute

Both glass containers are enclosed in a chamber with a magnetic field and when the laser light (with a specific wavelength) hits the gas atoms, the outermost electrons in the atoms react –like magnetic needles – by pointing in the same direction. The direction can be up or down, and it is this direction that makes up quantum information, in the same way that regular computer information is made up of the numbers 0 and 1.

The gas now emits photons (light particles) containing quantum information. The light is sent on to the other gas container and the quantum information is now read from the light and registered by a detector. The signal from the detector is sent back to the first container and the direction of the atoms’ electrons is adjusted in relation to the signal. This completes the teleportation from the second to the first container.

New method

The experiments are carried out at room temperature and the gas atoms therefore move at a speed of 200 meters per second in the glass container, so they are constantly bumping into the glass wall and thus lose the information they have just been encoded with. But the research group has developed a solution for this.

“We use a coating of a kind of paraffin on the interior of the glass contains and it causes the gas atoms to not lose their coding, even if they bump into the glass wall,” explains Professor Eugene Polzik. It sounds like an easy solution, but in reality, it was complicated to develop the method. Another element of the experiment was to develop the detector that registers the photons. Here the researchers developed a particularly sensitive detector that is very effective at detecting the photons. The experiments therefore work every single time.

But it is one thing to perform tests in a laboratory and quite another to apply it in wider society! In the experiment, the teleportation’s range is ½ meter – hardly impressive in a world where information must be transported around the world in no time.

“The range of ½ meter is entirely due to the size of the laboratory,” explains Eugene Polzik with a big smile and continues – “we could increase the range if we had the space and, in principle, we could teleport information, for example, to a satellite.” The stable results are an important step towards the quantum communication network of the future.

Reference: “Deterministic quantum teleportation between distant atomic objects” by H. Krauter, D. Salart, C. A. Muschik, J. M. Petersen, Heng Shen, T. Fernholz and E. S. Polzik, 2 June 2013, Nature Physics.
DOI: 10.1038/nphys2631
arXiv:1212.6746

 

1 Comment on "Researchers Demonstrate Quantum Teleportation Between Distant Material Objects"

  1. C. Peter O'Connor | June 6, 2013 at 10:14 am | Reply

    It seems to me that, all they are doing in this instance is using electron/Positron attraction to piggyback particles and that the reason for their success this time is due to the electrons held within the paraffin to continue the process of transfer, giving the appearance that the same electrons are involved, when they perhaps aren’t. Which in real terms would mean the actual ‘Information’ transfer is false.

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