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Time Warp: Delayed-choice quantum erasure
11–20 of 82 posts
Re: Time Warp: Delayed-choice quantum erasure
#12It would be nice if photons from the past could be captured to take pictures of millennia ago.
If you could use a wormhole to travel 50 million light years away from earth instantly, then look back at earth with a sufficiently powerful microscope, I believe you could observe the dinosaurs.
Re: Time Warp: Delayed-choice quantum erasure
#13It would be nice if photons from the past could be captured to take pictures of millennia ago.
If you could use a wormhole to travel 50 million light years away from earth instantly, then look back at earth with a sufficiently powerful microscope, I believe you could observe the dinosaurs.
50 million light years would not get you light from 65+ million years ago.
Re: Time Warp: Delayed-choice quantum erasure
#14It would be nice if photons from the past could be captured to take pictures of millennia ago.
If you could use a wormhole to travel 50 million light years away from earth instantly, then look back at earth with a sufficiently powerful microscope, I believe you could observe the dinosaurs.
There is this sci-fi book about this, but I forgot name/author. In the book a wormhole end can be positioned anywhere in space and time history. The tech starts as an ITER-like project and then becomes available in mainstream products, and all the dirty secrets of mankind come to light.
Re: Time Warp: Delayed-choice quantum erasure
#15It would be nice if photons from the past could be captured to take pictures of millennia ago.
It "can" be done. Some photons leaving the earth a thousand years ago. Bouncing off a mirror in some distant planet and allowing us to see two thousand years into the past
Re: Time Warp: Delayed-choice quantum erasure
#16Earlier quoted context omitted.
If you could use a wormhole to travel 50 million light years away from earth instantly, then look back at earth with a sufficiently powerful microscope, I believe you could observe the dinosaurs.
50 million light years would not get you light from 65+ million years ago.
Imagine seeing the exact point in time the asteroid hit!
Re: Time Warp: Delayed-choice quantum erasure
#17I appreciate this article, as I agree with the author that the delayed-choice quantum eraser is a misnomer due to ignoring what we now know of quantum states. It's really frustrating learning modern quantum mechanics but then reading about the delayed-choice quantum eraser making conclusions from an older understanding.
However, I still haven't seen anyone do the math about it. It shouldn't be too hard to keep track of a photon's state through Kim et al.'s experiment, and I think it would be clearer than relying on words alone (as done by the author here). I have attempted this myself, but I am particularly terrible at quantum optics. If anyone has seen such a derivation before please let me know.
Re: Time Warp: Delayed-choice quantum erasure
#18I am I crazy or do Feynman diagrams not explicitly show interactions of particles moving back in time?
Re: Time Warp: Delayed-choice quantum erasure
#19It would be nice if photons from the past could be captured to take pictures of millennia ago.
If you could use a wormhole to travel 50 million light years away from earth instantly, then look back at earth with a sufficiently powerful microscope, I believe you could observe the dinosaurs.
The photons would be so spread out that you'd need a telescope with a primary optic bigger than anything else in the universe. And even then, you'd struggle to capture enough to have any meaningful information.
Re: Time Warp: Delayed-choice quantum erasure
#20I am I crazy or do Feynman diagrams not explicitly show interactions of particles moving back in time?
Yes they do and that is the secret to the wave-particle duality manifested in the double-slit experiment. Information from future completely illuminates (pi) the paradox.