Hello guys, In this video I am going to talk about Quantum Computers
Quantum computing which is going to be the future of computing
So, In this video I am going to talk about What is Quantum computers, How it works?
and its comparison from normal computers and super computers
In last video I told you that how modern computer's CPU transistors are shrinking every year in size
up to the scale of 10nm , 7nm etc.. but there is a limit
even smaller transistors will be of subatomic size means smaller than atom
and in this subatomic transistors, electron starts jumping barrier..which didn't happen in bigger transistors
So, In smaller transistors.. currents starts leaking because electrons behaviour changes
this is called Quantum Tunneling
means in normal computers transistors of subatomic size starting to fail to work
because Subatomic world's physics is different from our normal world physics
This subatomic world can also be called as Quantum Realm
U might have heard about Quantum Realm before in Ant-man movie.. Ant man goes to Qauntum Realm..
Qauntum realm is not like that movie has shown but quantum realm exists..like a microscopic world and our world is Macroscopic
and u might be surprised knowing that Quantum Realm physics behaves differently than our normal world physics
So lets talk about Quantum Realm magical physics before talking about Quantum computers
like in our normal world if we try to throw ball on wall it bounces back
but in quantum world chances are there that electron passes throw the wall instead
like in small transistors..electron crossed the thin barrier
So in normal world we know where is ball and how it will behaves but in quantum electron behaviour is uncertain
Electron sometimes behaves like wave sometimes like particles..just like light as einstien said
this we call SUPERPOSITION bcoz it can be anything or anywhere at at time
Like Superposition, Entanglement is also very interesting in Quantum world
In this if two objects interact with each other then we place them apart then still they will behave same like other one
as example if you take 2 coin and interact them and place them a galaxy apart and toss them and result will still be on same..head-head..tail-tail
So quantum world is very intersting and scary at the same time..thats why Einstein called it spooky world
Now Lets get back to quantum computing
as i told earlier that quantum tunneling starts in small transistor and quantum physics laws starts to interfare causing it to fail
So scientists thought why not use it for our own advantage and Quantum Computer came to existance
In quantum computing- Quantum realm physics works and in Normal computing - normal physics
In normal computer transistors either can be on or off means 0 or 1
one value at a time
But in quantum computers Quantum bits or Qubit exist in place of classical bits
qubit works on the law of quantum physics
like i told earlier about superposition that at one time electron can be two things
just like that Qubit here can be 0 AND 1 both at the same time
Remember the difference: BIT - either 0 OR 1 , Qubit- 0 AND 1 both
Qubit being 0 and 1 at the same time is a very big deal
it seems small in 2 Qubit scale but it power grows exponentially in comparison to Bit
Bit process 1 value at a time, Qubit can process all the same time
just like that 4 bit process 1 value out of 16 at a time but Qubit does it all at the same time and
and adding more Qubit increases Quantum computer processing power exponentially
Only 20 Qubits can process 1 Million possibility at a time which normal computers do one by one
Qubits stays in superpositon while processing but gives exact result in 0 or 1 just like a bit
To truly understand Bit Vs Qubit ..Take a coin for example
In Bit - Coin will be either Heads or Tails
bit in Qubti coin spins and while spinning we cant tell if it is heads or tails..thats superposition means it is both heads and tails
but gives result as heads or tails at last just like a bit
