Photons undergoing polarization == destroying the uniqueness of each human being.

I have always been a physics enthusiast..or had a craze in understanding how nature works. 
Recently my intrest pushed me into learning something new which can full fill my urge to involve physics into my coding journey. And thats how I started to explore Quantum computing. 

The following are my recent learnings and thoughts on them and correct me if I'm wrong 🤞:

Under the hood.. quantum computing revolves around the principles of Quantum mechanics!!. So in order to understand the quantum mechanics, We require a physics lab🤭. But there exists a simple way to illuminate the classical quantum mechanic concepts and that is through LIGHT💡. 

Yes light it is! 
Basically.. we all know that quantum computers work on qubits, ie. they are neither strictly 0s nor 1s. They are super-posed and Entangled. 
What do I mean by that??

Qubits can exist in both the states (0 and 1) at a time. And that is why they are called super positioned. 
Entanglement is defined as the ability of the qubits to exists in any direction. It need not be in horizontal or vertical direction. (Need not be only in x y z components)
This behaviour is seen in light, also known as photons.

Photons behave like qubits and it is  justified by analyzing the behaviour of photons when they are subjected to polarization. 

So what is polarization ??
Polarization in short is the way of filtering out the aligned photons from a light source. (This sounds cruel to me) but the real world applications of polarization are many such as cooling glasses that we use in summer or the protective shield that people use while welding metals.
The main motive of polarization is to decrease the intensity (brightness) and allow only the safe light waves to reach our sight. 

But, photons are born with such amazing property (superposition) with which we can clearly understand the magical concept of quantum mechanics!

Polarization of light and its magical quantum behaviour


Physics is all about imagination.
Imagine you have a light source like shown in the figure up there. You can clearly see that the light source is beautiful and has are scattered in all directions.
But when the horizontal and vertical components of the  light source is subjected to a polarizer (a slit in which there is a vertical opening, it acts like a filter) only the vertical component comes out.

So now the light is gonna be visible only when we have a vertical opening. And so when it goes through the analyzer in the second diagram where the polarizer is tilted to a 45°, the intensity of the light is in the probability of 0.5..


But inorder to prove the vertically polarized photons can also pass through the horizontal polarizer, we keep another polarizer having an angle of 45° in the middle and when  the vertically polarized photons (100%) pass through that polarizer.. 75% of the photons get through and when those 75% of photons pass through the horizontal polarizer, 25% of them get through. 

Hence this behaviour is not possible in classical physics. According to classical physics, vertical components cannot pass through horizontal (90° angled) polarizer. But as photons have the properties of superpositions it is justified to be false. 

So whats super intresting with this? 
In laymen terms, imagine you have a robot and when that robot works on the principles of bits (0s and 1s), it can perform only on task at a time. But when a robot is built with the principle of qubits they are perform multiple tasks at the same time. And this allows huge complex computational processess which would take millions of years for a normal computer to solve and a quantum computer does that in minutes. 

With this, from human pov I believe that being messy or superposed is not bad. You need not be either 0s and 1s. Just embrace your randomness and you will also be as magical and robust like a Quantum computer💡

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