Electrical engineers at Purdue University have found a way to make your data disappear completely--into holes in time. The technique, described in a paper published online in Nature yesterday, uses pulses of light to create "time holes" that allow communication across optic fibers to disappear completely.
The idea of a data cloak, a way to hide the transfer of data in "time pockets," has existed for a few years, but until now the effect didn't last long and wasn't consistent enough to be of any practical use. This is the first temporal cloak that can work quickly enough to hide data streams in telecommunications systems. It can work to hide up to 46 percent of the window of time it takes to transfer data (one of the first temporal cloaking techniques worked less than one percent of the time, according to a Purdue release).
This cloak works using a wave phenomenon called the Talbot effect. Manipulating the timing of light pulses so that the crest of one light wave interacts with the trough of another creates a zero light intensity--where the two signals cancel each other out--in which data can be hidden.
Right now, author Joseph Lukens, a Purdue graduate student, says the cloaking effect is almost too efficient. "We erased the data-adding event entirely from history, so there's no way that data could be sent as a useful message to anyone, even a genuine recipient," he told Nature. Future tweaking might solve this problem to allow super-secret messages to pass through undetected and still make it to the intended recipient. But maybe they can use the current version to destroy embarrassing emails mid-send?
what, the, fuck?
how? what? i don't understand how this works? you are slowing down light at one end and speeding it up at another end and somehow this is erasing history?
to mars or bust!
Yeah i dont fully understand either what is this for?? xD
its like waves on a lake, drop 2 rocks and those waves will cancel each other out when in contact (the pretty little Xs you see)
same goes for light here as i understand, that way you can hide data sent by fibers...
the 46% window time, i didnt clearly understood though ..
No facts, No response...
Cool, perhaps will someday allow a way to travel to the stars - one instant in a time bubble is thousands of years, you wouldn't need to concern yourself with the limits of light speed.
So, basically they made the light analogue of noise-cancelling headphones?
I feel the "time cloak" part is just marketing bull****, they in no way mention that you can erase an information in the past. You can intercept it and destroy it. The reason this has only been done for sound is that light is a "bit" faster. Good luck reading light, generating the anti-phase and then catch up to the light, of course thereby going above light speed. You can demonstrate it like they did, if you already know what information you are going to send that you want to erase.
It's simple, they mess with the signal so it doesn't appear when you scan it. There is nothing temporal about it. No time was travelled, nothing was cloaked, they just varied a pulse of light.
I understand the wave concept and am very familiar with the cancellation effects but how did they ever intend to get the information back?
I think that's what's confusing us all. This sounds like they are over-describing or hyping a common concept to make it sound like they really did something new. Of course the light waves would cancel but it's not anything new, or should I say important, unless you can get the information back from the zero value wave created.
Holy excessive hype Batman. "We erased the data-adding event entirely from history..." Really? Hiding data in "time pockets"? Really? They admit the data was destroyed and they'd like to find a way to employ this method whilst getting the data to the recipient...what's this about time pockets? Where do they think they hid the data if it was destroyed? It seems as though they're just intercepting a transmission through a fiberoptic cable and using the same method they use for noise cancelling technology but on light instead.
One burning question I have, and I am definitely not an expert on fiber optic transmissions: Isn't most data being transmitted through a fiber optic cable digital? They seem to be describing an analog transmission.
I think that I get the basics -- only after checking Nature article. PopSci has an annoying habit of editing out crucial details.
FWIW, they use a waveguide and some electrical impulses to zero out ( pretty much) the original message for a short time.
It does seem similar to other cancellation effects, but doing it requires different tech ( the special waveguide).
During this blank period, they add a new message -- and they can see it.
Here's where it gets bad. They reapply the waveguide stuff to restore the original message. The added message is now gone. ooops
I could be missing something, but that's how it plays for me. The results don't seem surprising.
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