Quantum Tunneling Explained: Sophisticated Overview

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Discussion Overview

The discussion revolves around the concept of quantum tunneling, with participants seeking a deeper understanding of the phenomenon beyond elementary explanations. Topics include the mechanics of tunneling, the implications for particle behavior, and potential applications such as teleportation.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses a desire for a sophisticated understanding of quantum tunneling, initially stating that it involves particles colliding at high speeds where mechanical energy exceeds potential energy.
  • Another participant corrects this by stating that tunneling occurs when mechanical energy is lower than the potential energy of the barrier.
  • There is a discussion about whether particles can appear inside other particles, with some arguing that they cannot occupy the same space, while others clarify that two particles can occupy the same space under certain conditions.
  • Concerns are raised about the nature of the space on the other side of the barrier being occupied by other particles, particularly in the context of air molecules.
  • A participant emphasizes that particles are not moving at high speeds or colliding, noting that such collisions would lead to a loss of coherence and diminish tunneling current.
  • Questions arise regarding the randomness of tunneling, the time it takes for a particle to appear on the other side of a barrier, and whether this could imply faster-than-light (FTL) travel.

Areas of Agreement / Disagreement

Participants exhibit disagreement on several aspects of quantum tunneling, including the conditions under which it occurs, the implications of particle behavior, and the interpretation of tunneling in relation to speed and randomness. The discussion remains unresolved with multiple competing views present.

Contextual Notes

Participants express uncertainty about the definitions and implications of quantum tunneling, particularly regarding the conditions under which particles can tunnel and the nature of the space involved.

Who May Find This Useful

This discussion may be of interest to those studying quantum mechanics, particularly in understanding the nuances and complexities of quantum tunneling and its implications in various physical contexts.

NetMage
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So I've been reading up on some quantum tunneling. It seems as though everything I read on it only conveys an elementary view on the matter, as if their target audience was the general public. I am here to gain a more sophisticated understanding of this concept. As I currently understand quantum tunneling is the effect of particles colliding at high speeds as to where the mechanical energy is greater than the potential energy of the barrier and in QM there is probability that the particle will appear on the other side regardless of the width of the object?! Why is there not a chance that the particle could appear inside the object? Has there been successful studies done on this? Does this constitute possibilities in teleportation/information sending?
 
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Actually, it is where the mechanical energy is LOWER than the potential energy of the barrier.
 
Oops, my mistake. Typo**
 
Also, i believe that particles that tunnel through something will not appear "Inside" another particle, as they can't occupy the same space. And quantum tunneling can also be used to explain when a particles overcomes a force that it shouldn't have. Such as being able to fuse atoms together at a lower energy than should be possible. Quantum tunneling can do this sometimes.
 
Ok, but if a particle can't appear inside space that is being occupied...isnt even the 'space' on the other side of the object still being occupied by other particles...for instance, air is still composed of particles that is occupying that space.
 
NetMage said:
Ok, but if a particle can't appear inside space that is being occupied...isnt even the 'space' on the other side of the object still being occupied by other particles...for instance, air is still composed of particles that is occupying that space.

Air is mostly empty space with atoms/molecules just whizzing through it.
 
Drakkith said:
Also, i believe that particles that tunnel through something will not appear "Inside" another particle, as they can't occupy the same space.

Two particles can occupy the same space just fine. Two fermions with the same spin and energy cannot.
 
NetMage said:
As I currently understand quantum tunneling is the effect of particles colliding at high speeds as to where the mechanical energy is greater than the potential energy of the barrier and in QM there is probability that the particle will appear on the other side regardless of the width of the object?!


The other thing that's wrong is that the particles are (i) not moving at high speeds and (ii) not "colliding". A collision will cause a loss of coherence. In fact in many instances, scattering effect will diminish the tunneling current.

Secondly, in many tunneling experiments, the "speed" is very small when one considers that the applied voltage across the tunneling barrier is on the order of millivolts!

Zz.
 
Hm, well this is a bizarre concept. So it is to say that it is complete random chance that if the mechanical energy is less than the barrier that it will simply appear on the other side? What about time elapsed during the particle appearing on the other side? Is this instantaneous? Does this constitute FTL if so?
 
  • #10
NetMage said:
Hm, well this is a bizarre concept. So it is to say that it is complete random chance that if the mechanical energy is less than the barrier that it will simply appear on the other side? What about time elapsed during the particle appearing on the other side? Is this instantaneous? Does this constitute FTL if so?

I have no idea on this one.
 

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