Big Brother Will Have Some Difficulty 'Watching You' in the Future

For example, establishing a secure quantum communication link over long distance is very challenging: “Quantum links (as in fibre optics) using patterns of light languish at short distances precisely because there is no way to protect the link against noise (interference from, for instance, fog or a bend in a cable) without detecting the photons. Yet, once they are detected their usefulness is destroyed,” says Forbes.

This catch 22 situation has been a seemingly insurmountable obstacle. Now the team has shown that this can be overcome using classical (many photon) light fields, enabling real-time quantum error correction.

By preparing and sending a so-called “classically entangled” beam the team could show that this was identical to sending a quantum state. This means that the observed quantum entanglement decay due to noise in the link can be reversed, paving the way for major advances in secure quantum links in fibre and free-space.

“We showed for the first time that classical light can be used to analyse a quantum link, acting as a direct equivalent to the behavior of the quantum state,” says Bienvenu Ndagano, lead author and PhD student at Wits University.

“Not similar, or mimicking, but equivalent. To show this, we exploited a particular type of laser beam, called vector beams, that have the property of being non-separable and sometimes called ‘classically entangled’.”

Ndagano explains that the quintessential property of quantum entanglement is the non-separability of the state, meaning that one part of the system cannot be separated from the other. “But non-separability is not unique to the quantum world: you can find it in weather maps where the locations on the map and the temperatures at those locations can’t be separated.”

Classically entangled light

More intriguingly, classical vector beams have this property too, which the team calls “classically entangled” light.

Says Forbes, “What we asked was: does this mean that classical light can be used in quantum systems – a grey area between the two worlds that we call classical entanglement?”.

“The notion of classical entanglement is hotly contested in the physics community with some arguing that it is merely a mathematical construct,” says Thomas Konrad (UKZN), co-author on the paper. “This work shows that there is physical meaning to it too, and we offer the first side-by-side data of the equivalence of classical and quantum entanglement”.

Previously, to fix an error in the quantum state used for secure communication would mean measuring the photon sent, which in turn would mean losing the information that one was trying to send.

This work allows for long distance quantum links to be established and tested with classically entangled light: as there is no shortage of photons in the classical light, all the measurements needed to fix the errors in the quantum state can be done in real-time without destroying the quantum information.

Thus, real-time error correction is possible as you can run experiments in the classical world that will tell you how to fix the error in the quantum world.

Fast and secure data transfer over real-world link

The team are working on packing as much information into photons using patterns of light as a means to encode the information. Since there are an unlimited number of patterns, the amount of information that can be sent securely is also in principle at least, unlimited.

While all patterns are equivalent in terms of information capacity, this work suggests that the choice of pattern also plays an important role in analysing and correcting the errors experienced by passing over the link.

“By working in this grey area between the classical and the quantum we can show fast and secure data transfer over real-world links,” says Forbes.

Contacts and sources:
Professor Andrew Forbes
School of Physics
University of the Witwatersrand, Johannesburg