Welcome to DU! The truly grassroots left-of-center political community where regular people, not algorithms, drive the discussions and set the standards. Join the community: Create a free account Support DU (and get rid of ads!): Become a Star Member All Forums Issue Forums Culture Forums Alliance Forums Region Forums Support Forums Help & Search

bananas

(27,509 posts)
Fri Mar 13, 2015, 06:13 PM Mar 2015

Two quantum properties teleported together for first time

http://physicsworld.com/cws/article/news/2015/feb/27/two-quantum-properties-teleported-together-for-first-time

Two quantum properties teleported together for first time
Feb 27, 2015

The values of two inherent properties of one photon – its spin and its orbital angular momentum – have been transferred via quantum teleportation onto another photon for the first time by physicists in China. Previous experiments have managed to teleport a single property, but scaling that up to two properties proved to be a difficult task, which has only now been achieved. The team's work is a crucial step forward in improving our understanding of the fundamentals of quantum mechanics and the result could also play an important role in the development of quantum communications and quantum computers.

<snip>

The team's work has been published in the journal Nature this week. Pan tells physicsworld.com that the team verified that "the teleportation works for both spin-orbit product state and hybrid entangled state, achieving an overall fidelity that well exceeds the classical limit". He says that these "methods can, in principle, be generalized to more (properties), for instance, involving the photon's momentum, time and frequency".

Verification verdicts

Physicist Wolfgang Tittel from the University of Calgary, who was not involved in the current work (but wrote an accompanying "News and Views" article in Nature) explains that the team verified that the teleportation had indeed occurred by measuring the properties of C after the teleportation. "Of course, the no-cloning theorem does not allow them to do this perfectly. But it is possible to repeat the teleportation of the properties of photon A, prepared every time in the same way, many times. Making measurements on photon C (one per repetition) allows reconstructing its properties." He points out that although the rotations were not ultimately implemented by the researchers, they found that "the properties of C differed from those of A almost exactly by the amount predicted by the outcomes of the comparative measurements. They repeated this large number of measurements for different preparations of A, always finding the properties of C close to those expected. This suffices to claim quantum teleportation".

<snip>

Pan says that to teleport three properties, their scheme "needs the experimental ability to control 10 photons. So far, our record is eight photon entanglement. We are currently working on two parallel lines to get more photon entanglement." Indeed, he says that the team's next goal is to experimentally create "the largest hyper-entangled state so far: a six-photon 18-qubit Schrödinger cat state, entangled in three degrees-of-freedom, polarization, orbital angular momentum, and spatial mode. To do this would provide us with an advanced platform for quantum communication and computation protocols".

4 replies = new reply since forum marked as read
Highlight: NoneDon't highlight anything 5 newestHighlight 5 most recent replies
Two quantum properties teleported together for first time (Original Post) bananas Mar 2015 OP
beam me up ,scotty................nt Romeo.lima333 Mar 2015 #1
I'd be a Leonard McCoy. longship Mar 2015 #3
My neurons are entangled ... GeorgeGist Mar 2015 #2
oops wrong spot Romeo.lima333 Mar 2015 #4

longship

(40,416 posts)
3. I'd be a Leonard McCoy.
Fri Mar 13, 2015, 08:10 PM
Mar 2015

There's no way I would step onto a transporter pad, even though I knew that a longship would materialize at the destination. Due to the continuity problem it just would not be this longship.

So, no way, Jose.


Latest Discussions»Issue Forums»Editorials & Other Articles»Two quantum properties te...