Hyper-Entangled Photons — 'Superdense' Coding Gets Denser

ScienceDaily is reporting that researchers at the University of Illinois have broken the record for most information sent via a single photon using the direction of "wiggling" and "twisting" a pair of entangled photons. "Using linear elements, however, the standard protocol is fundamentally limited to convey only one of three messages, or 1.58 bits. The new experiment surpasses that threshold by employing pairs of photons entangled in more ways than one (hyper-entangled). As a result, additional information can be sent and correctly decoded to achieve the full power of dense coding."

Comments

Nothing new here

[schklerg]

Sorry about this, but... People have been getting entangled by "wiggling" and "twisting" for a long time now.

Hyperentagled Students

[Galaga88]

I work in a college library and I can vouch that pairs of students who get hyperentangled in the study rooms or on one of our couches certainly seem to be capable of carrying much less information than non-entangled students.

Re:Hyperentagled Students

[blair1q]

The entangled ones are exchanging terabits of information. Of course, only the sum of 26 chromosomes - and only half of those from each source, will be persistent, and then only if neither has employed a firewall. But the resulting code will be a self-replicating automaton, which will eventually grow to occupy all of its parent objects' manageable resources.

Let's see a couple of photons do that.

Re:superdense alright

[blueg3]

They just mean that their objects can encode one of three states. The amount of information, in "bits", a state encodes is log2(number of possible states), and log2(3) ~= 1.58. By the same token, a single decimal digit stores 3.32 bits.

thanks ;-)

[circletimessquare]

THAT i understood ;-)

now i only have have 36 more questions before i completely understand the story summary... :-P