Physicists Theorize Out How To Retrieve Information From a Black Hole (sciencemag.org)

sciencehabit writes: Black holes earn their name because their gravity is so strong not even light can escape from them. Oddly, though, physicists have come up with a bit of theoretical sleight of hand to retrieve a speck of information that's been dropped into a black hole. The calculation touches on one of the biggest mysteries in physics: how all of the information trapped in a black hole leaks out as the black hole 'evaporates.' Many theorists think that must happen, but they don't know how.

Comments

Einstein was right

[Anonymous Coward]

> "Quantum teleportation enables two partners, Alice and Bob, to transfer the delicate quantum state of one particle such as an electron to another. In quantum theory, an electron can spin one way (up), the other way (down), or literally both ways at once. In fact, its state can be described by a point on a globe in which north pole signifies up and the south pole signifies down. Lines of latitude denote different mixtures of up and down, and lines of longitude denote the "phase," or how the up and down parts mesh. However, if Alice tries to measure that state, it will "collapse" one way or the other, up or down, squashing information such as the phase. So she can't measure the state and send the information to Bob, but must transfer it intact."

Really all she does is map the limits of the detector onto the electron. She takes a measurement, which is the measuring tools representation of the thing being measured. Not the actual thing itself.

So if I photograph a 3D scene with a camera, the result is a 2D picture. It hasn't made the world 2D, the limits you see in the picture are a result of the limits of the detector. A camera in this case.

QM says she "sets" it by the act of measuring it, but no such proof exists. And this led Einstein to point out the bogus nature of the claim with "spooky action at a distance". Why would the thing care or know about the limits of the detector being used to detect it?

So when I use an electronic detector to measure light, that has the issue that electrons are promoted through fixed energy levels, if it can't promote the electron then it cannot be detected. So that detector will appear to see light as flashes (when it can promote the electron), or dark (when it cannot).

Does the light think "oh.... right I'm in an electronic detector, so I should bunch up to look like particles/photons?" No, of course it doesn't, that's just what light would look like to a detector that can only detect fixed quanta!

And now we get to extremes like the Delft experiment. Where they filter out any experiment result that isn't "entangled" then put it into a Bells test to prove "entanglement". And claim this as a loophole free proof?? Seriously?

Reservations re Hawking radiation

[Black Parrot]

Ignorant amateur here. ISTM that if a virtual pair appears straddling the event horizion, the one that gets away never was inside the black hole to begin with, and thus would not carry away any matter or energy. Isn't the black hole just working as an engine to extract matter/energy from the vacuum near the event horizon? Half of which goes in, making the BH bigger, and half of which escapes to the external universe.

In the unlikely event that that conception is correct, it would be interesting to think about what happens to the vacuum near the event horizion. Does it get depleted of its vacuum energy, or is it an infinite source? If depleted, does vacuum energy flow in from other nearby vacuum to replenish it?

Is the vacuum inside a black hole anything like the external vacuum?