204117Re: Universal language for communicating with space aliens
- Jul 25, 2014Just chiming in to correct a deep misunderstanding of physics.
On 25 July 2014 10:57, Patrik Austin <patrik.austin@...> wrote:
> Warren, the idea I gave you is not in Wikipedia. It's a hypothetical
> sci-fi idea and so it just happened that after my message this news came
> I wasn't necessarily talking about a so called quantum computer. What I
> meant was: you have an entangled pair A and B and you take B to Mars. When
> you change the polarity of A, the polarity of B also changes.
And that's where you are making a very big mistake: once A and B are
entangled, *you cannot change the state of A without losing the
entanglement*. I.e. if you change the polarity of A, the polarity of B
isn't in any way connected to the polarity of A anymore. Information can
only be sent once, in other words, and since you still have to physically
move B to Mars, that information transfer was effectively slower than the
speed of light. Thinking otherwise is a deep misunderstanding of what
quantum entanglement is. Quantum entanglement, like every quantum
phenomena, is a superposition of states, and only exists as long as neither
A and B are significantly disturbed. Changing the polarity of one or the
other *is* a significant disturbance, and destroys the entanglement.
Now it still *is* interesting, and quantum teleportation could lead the way
to interesting technologies, but not to faster than light communication.
> If you have many of these you can send binary code without time delay. You
> can use conventional computers but you will need special detectors and
> transmitters in between.
No you can't, because you can't disturb A during the trip B makes. In other
words, the only way information can be transmitted is by setting A
correctly *before* the entanglement, entangle it with B, send B to Mars,
and only then make the measurement that collapses the states of both A and
B. That collapse is instantaneous (and can be, as it is not a physical
phenomenon), but since it can only be done once and you couldn't disturb A
during that process, the information transfer is only as fast as the
physical trip of B from here to Mars, which can only be at most as fast as
the speed of light. Very interesting, but no FTL.
President of the Language Creation Society (http://conlang.org/)
Personal Website: http://christophoronomicon.blogspot.com/
Personal Tumblr: http://christophoronomicon.tumblr.com/
- << Previous post in topic Next post in topic >>