Crackpottery

# Crackpottery 102: How Photons Gain “Consciousness”

In Crackpottery 101, I tried to demonstrate what happens when people try to “explain” random outcomes. By “explain” I mean finding a reason or a “why” for the outcomes of probability. The explanation could lead to the absurd notion that coins are intelligent! That post was a precursor to this one, in which people, even some professional physicists, try to “explain” the behavior of photons by attributing consciousness to them. The “consciousness” of photons has a very dangerous ripple effect. It becomes a “science-based” ammunition for modern crackpot spiritualists to give credence to their nonsense and attract millions of educated followers. That is why an elucidation of the quantum theory of photons becomes so essential.

Quantum physics is the most successful theory invented by mankind. It is a mathematical theory whose equations yield a complex (as in “complex numbers”) mathematical function denoted by (pronounced “sigh”), which contains information about the behavior of a physical system. Quantum physics is based on two assumptions about :

• The (magnitude) square of is the probability of the behavior of the system. That is why is called the probability amplitude.
• If there are two paths for the system to develop, the total of the system is the sum of the s for each path. This is called the superposition principle.

Superposition principle is an all-embracing law that applies not only to quantum phenomena, but also to ordinary situations. It is, for example, responsible for a boat to go northeast when the engine pushes it northward and the water flow carries it eastward.

The two assumptions lead to some strange observations described is the famous double-slit experiment. Take a screen that blocks light. Cut two (very very close) identical slits in it. Cover one slit and send photons (particles of light) one at a time toward the two slits. Collect the photons that pass through the hole on a photographic plate. Quantum theory cannot predict the exact location of each photon on the photographic plate, because it is a probabilistic theory. But, as is true in probability, when you send a large number of photons, the prediction of probability becomes more and more realizable, and the shape of the image determinable.

What is the shape of the image formed on the photographic plate after you send a large number of photons? Something like what you see on the right: a single blob. Now cover the first slit and send photons through the second one. The same image is formed on the plate.

Now open both slits and send the photons one by one. What is the image formed on the plate? You expect something like the image on the left. Right? Wrong! What you actually see is shown on the right! It is the image of a single slit with some dark bands striking through it. This is really spooky! How do you explain this? Gary Zukav, Oprah’s favorite spiritual leader, has a very good “explanation” on page 62 of his best-seller, The Dancing Wu Li Masters:

… How did the photon in the first experiment know that the second slit was not open? Think about it. If both slits are open, there are always alternating bands of illuminated and dark areas. This means that there are always areas where the photons never go … When we fired our photon and it went through the first slit, how did it ‘know‘ that it could go to an area that must be dark if the other slit were open? In other words, how did the photon know that the other slit was closed? There is no definite answer to this question. Some physicists speculate that photons may be conscious!

The question at the beginning of the quote, with the word “know” starting it, already hints at a conscious photon. Zukav and the physicists to whom he refers at the end of the quote did not pay attention to the warning in Crackpottery 101!

Despite Zukav’s claim, there is a definite answer to the question. When one slit is open, there is only one . Square it and you get the probability, which translates into a blob. If the slits are identical, you get identical probabilities and images for the two. When two slits are open, superposition principle tells you to first add the s and then square the sum. The result is not the sum of the squares and the figure on the left above, but an expression which is zero at some points of the photographic plate. A zero probability means zero photons, thus the dark bands in the graph! 1 Let me repeat my warning in Crackpottery 101 in the context of quantum physics:

WARNING! Quantum physics is based fundamentally on probability. If you try to “explain” the outcomes of quantum events, you may turn into a crackpot, as have many people, including some holding a PhD in physics.

1. If you know complex numbers, especially their polar representation, then this article shows how the dark bands arise.

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