Einstein's 'spooky' steering needed for secure quantum teleportation

December 7, 2015
Einstein's 'spooky' steering needed for secure quantum teleportation

'Teleportation' – the word evokes images of the fictional Star Trek universe where humans and objects are 'beamed' to another location.

Now, researchers including Swinburne University of Technology's Dr Laura Rosales-Zarate and Professor Margaret Reid, together with a team from China and Europe, have demonstrated the precise requirements for secure quantum teleportation.

While sounding like something from science fiction, secure quantum teleportation is essential for a future quantum internet that allows information to be transmitted with absolute security.

"Teleportation works like a sophisticated fax machine, where a is transported from one location to another," Professor Reid said.

"Let's say 'Alice' begins the process by performing operations on the quantum state – something that encodes the state of a system – at her station. Based on the outcomes of her operations, she communicates (by telephone or public internet) to 'Bob' at a distant location, who is then able to create a replica of the quantum state.

"The problem is that unless special requirements are satisfied, quantum mechanics demands that the state at Bob's end will be 'fuzzed up'."

The researchers have shown that to avoid this, Alice and Bob need available to them a very special form of , known as 'Einstein-Podolsky-Rosen steering'.

"Only then can the quality of the transported state be perfect," Professor Reid said.

"The beauty is that quantum mechanics guarantees that a perfect state can only be transported to one receiver. Any second 'eavesdropper' will get a fuzzy version."

According to Professor Reid, this work provides yet another practical application for the spooky idea of 'quantum steering' proposed by Einstein and Schrodinger, where a measurement can have an immediate 'steering' effect on another distant state.

This research was published in Physical Review Letters.

Explore further: Entanglement recycling makes teleportation more practical

More information: Qiongyi He et al. Secure Continuous Variable Teleportation and Einstein-Podolsky-Rosen Steering, Physical Review Letters (2015). DOI: 10.1103/PhysRevLett.115.180502

Related Stories

Entanglement recycling makes teleportation more practical

January 17, 2013

(Phys.org)—Working in the exotic-sounding field of quantum teleportation, physicists are trying to make it easier to transmit quantum information in the form of qubits from one location to another without having the qubits ...

Scientists produce status check on quantum teleportation

September 30, 2015

Mention the word 'teleportation' and for many people it conjures up "Beam me up, Scottie" images of Captain James T Kirk. But in the last two decades quantum teleportation – transferring the quantum structure of an object ...

Researchers take two big steps toward quantum computing

November 6, 2015

(Phys.org)—"Spooky action at a distance," Einstein's famous, dismissive characterization of quantum entanglement, has long been established as a physical phenomenon, and researchers are keen to develop practical applications ...

Recommended for you

Counting down to the new ampere

August 29, 2016

After it's all over, your lights will be just as bright, and your refrigerator just as cold. But very soon the ampere—the SI base unit of electrical current—will take on an entirely new identity, and NIST scientists are ...

Measuring tiny forces with light

August 25, 2016

Photons are bizarre: They have no mass, but they do have momentum. And that allows researchers to do counterintuitive things with photons, such as using light to push matter around.

2 comments

Adjust slider to filter visible comments by rank

Display comments: newest first

El_Nose
4 / 5 (4) Dec 07, 2015
The world of quantum teleportation would see a world of good if Start Trek were never used in the same article as it is. It confuses people who are not physicists. There is no disappearing and reappearing in quantum teleportation... and it is not faster than light, and it uses a fiber optic connection... it is nothing like the 'common' usage of the word that it confuses the heck out of people and they scream at you with words never realising their mistake
antialias_physorg
5 / 5 (3) Dec 07, 2015
Yeah. I wish people would look up the concepts:
Quantum information:
https://en.wikipe...ormation
and
Information:
https://en.wikipe...n_theory

...and realize the fundamental difference between the two before getting all confused. (Quantum teleportation has nothing to do with teleportation - Star Trek or otherwise)

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.