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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."
Great, now come and untangle my brain cells.
So they're using slashcode?
I don't need no instructions to know how to rock!!!!
whuh?
Sorry about this, but... People have been getting entangled by "wiggling" and "twisting" for a long time now.
Be Excellent To Each Other
I've seen my share of dense coding in my time as well.
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.
"They then encode a message in the polarization state by applying birefringent phase shifts with a pair of liquid crystals." Just say you reversed the polarity! We've been waiting to hear it for decades now. Just come out and say it already! Enough of the cock teasing. This is science damn it, I want my compensator. I want to flux my capacitors!
"Don't feel bad for me child; I'm the monster that hides under your bed."
superdense
that's how i feel after reading that summary
1.58 bits?
wtf?
intellectual property law is philosophically incoherent. it is your moral duty to ignore it or sabotage it
Do not click.
Link contains shock site.
Shakespeare poems - infinite monkeys with infinite time.Computer tech support - a few trained ones working from 9 to 5.
If it takes an entangled pair to send 1.58 bits then it doesn't sound better than 1 bit per photon. Can anyone explain?
The above link will shred your windows boxen, mod down a lot!
"Be light, stinging, insolent and melancholy"
THAT i understood ;-)
:-P
now i only have have 36 more questions before i completely understand the story summary...
intellectual property law is philosophically incoherent. it is your moral duty to ignore it or sabotage it
The Nobel prize frequency needs to be updated. Once a year used to be fine but now they could give out a prize once a week and still have deserving people go unnoticed. I suppose in another decade they could be giving it out every day. Singularity here we come!
Shh.
First off, isn't this rehashed news from 2005?
Secondly, why did they have to change the word polarization to "wiggling"? As if lay people didn't know the word polarized from experience with their sunglasses.
Perhaps I'll concede that calling orbital angular momentum to "twisting" may be a reasonable twisting of the terminology, although in earlier papers they refer to "spiraling" or "cork-screw" which seems like a much better scientific-speak-transliteration to me...
Perhaps I just found a new use for my vacuum cleaner.
I never underestimate how creative scientists can be. I'm sure we will find some terrestrial uses.
If you click on the link, the article is basically a series of long quotes from Paul Kwiat, whose Quantum Physics class I *just* recently completed. He is pretty much the coolest teacher ever. He started the course off with a movie about quantum physics he put together himself, set to the theme song of Star Trek: TNG. Every day he wears suspenders and a huge bow tie. This is so cool. Who says good researchers have to be crappy professors?
This poster needs to be banned badly. He keeps posting malicious links.
Now I can have an excuse!
...with the release of IE6.
Sacred cows make the best burgers.
First you display goatse stuff, and then you lock up my box so I can't close the window.
you are scum.
Seems to me that angle isn't quantized. Therefore, the amount of information that one can encode on a single photon is only limited by our ability to encode and decode the angle at which a photon is traveling. Given the ability to measure the angle of a photon down to, oh, something on the order of 10e-34 radians or so, one should have no problem transmitting multiple yottabytes on a single photon.
We now just have to do it with tangible particles then put half on MSL and half in JPL, measure the states, and alter the states, for elimination of information transmission times, drive the rover at real-time speed.
There is no magic box you can feed a photon into and get out its angle of polarization. Roughly speaking, what you can do is choose a pair of perpendicular directions, say up-down and left-right, and ask which direction the photon is polarized in. If the photon is polarized in an in-between direction, you have some probability of getting either result.
I'm surprised nobody's mentioned it yet, but Star Trek computers were supposedly based on a Ternary number system - each element could be in one of three possible states.
...brand new, all over again.
DO NOT CLICK THAT LINK. Look at URL and you'll see that it's the same old one that takes control of your browser and drops a virus in the system. Also forces your browser to open pop-up (so much for disabling them) with children pornography and violent scenes. I hope that guy gets caught, thrown in jail and the key thrown away.
Does this mean we'll be getting our porn even faster?
Seven puppies were harmed during the making of this post.
Actually, my question is more like: Why couldn't we encode a theoretically infinite number of states by using the wavelength of the photon? Say for example you fix 445nm as the start point, and 476nm as the end point, and say that every additional nm of wavelength = 1 decimal number? Then you have 32 potential states, or 5 bits in a single photon. If every half-nm were a wavelength then you have 6 bits, and so on and so forth. There is obviously a hole in my reasoning here -- what exactly is it? What is it about wavelength that is no good for encoding information?
How on earth did that mess up my computer so badly? I'm using Safari 3.1 in Windows 2003 and it it still fucked me up--dozens of gay porn windows, telnet sessions popping up doing god knows what, dozens of skype and AIM programs starting to run. How did he do it, and is my computer compromised?
I just emailed the staff at Slashdot about that "Anonymous Coward" asshole. I'm sure that account will be removed any minute now!
512 MB RAM, 20 GB disk, 200 GB transfer, five datacenters. $19.95/month.
Orwell: "In a Time of Universal Deceit, telling the Truth is a Revolutionary Act"
So what do you call the base unit of data in a base three system? Clearly bits doesn't cut it. Is this one of those quantum things like 'as the amount of data in a base 3 system becomes known in base 2, then the chances of knowing how or why to do anything useful with the data exponentially approaches 0
thx e
So what do you call the base unit of data in a base three system?
My suggestion would be 'tit'...
You call it whatever you want, I suppose. The general term is a digit (for any base). But you just convert base-2 numbers into base-3 for communication, and then back -- similar to how a computer converts our base-10 numbers into binary before using them.
Zero represented in two bits: 00
Zero represented in 1.58 bits: 0C
"When information is power, privacy is freedom" - Jah-Wren Ryel
I thought the same thing a half second before I read your comment...
It's not wasting time, I'm educating myself.