Written by Ayush Raj
So to tackle these issues, we need a computer
which will be more powerful and fast in comparison to our modern day’s
computer. To achieve this, a new edge technology is being tested to make
computers more powerful. It’s called "Quantum Computing". In this blog, we are going
to learn about "Quantum Computer".
Quantum Computer Vs Classical Computer:
At this stage, the
outcome is said to be head, tail, or both at the same time. This is how qubit
functions work. It is similar to a coin in the air. The qubit will
have two states until you measure it. Once you implement a measurement to the
qubit, it will directly get one of the two possibilities either a “0” or a “1”.
This is how a quantum computer works. A quantum computer uses the principle
of “Quantum Entanglement” and “Superposition”. While a classical
computer will be calculating in ifthisthenthat, a quantum computer would
give the result. It is because of a “Quantum
Computer” computes both the possibilities at once while a classical computer does the same job one by one. This makes a Quantum computer many times
faster than a classical computer.

Artificial Intelligence: "Quantum computers and AI also share another trait:
exponential growth” writes Tristan Greene for The Next Web. “Processors for
quantum devices are measured in qubits, with today’s most advanced ones coming
in at around 50 qubits. At this size, they’re equivalent to a supercomputer".
Today, Computers have become an essential part of our life. From Researches and Medical implementations to exploration of space and technical advancements, nothing is possible without computers. In the last few decades, we have not only minimized the size of computers but also have increased its computational power significantly.
But even after so many improvisations, our computers are yet not perfect in many ways. They take much time in solving complex mathematical equations. The security systems & confidential data can also be easily compromised by targeting the vulnerabilities present in our computer systems.
A "Quantum Computer" at IBM 
Quantum Computer Vs Classical Computer:
To understand Quantum
Computing, First it’s important to understand the working of a classical
computer. A classical computer has a processor which uses transistors to
calculate or compute the result of a given input. A transistor can be in two
states: On and off state. In scientific terms, these states are
represented as “0” and “1”.These are called "Bits". Collectively, it is called as
a "Binary system". Programmers create many complex programs like MS Office by
just using these Binary forms of inputs. Any complex Program is written by
defining the conditions of ifthisthenthat.
Quantum Computing:
Quantum Computing uses “Qubits” as its basic unit of data. A Qubit is different from bits. “Quantum bits” or simply saying “Qubits”
differ from regular bits by the ability to operate in both “1” and “0” states
simultaneously. It’s called a superposition. Superposition is one of
the key principles of quantum physics.
To explain it briefly, imagine tossing a coin which is either
one of the two possible outcomes, a head or a tail. A ‘Classical computer’
works in the same manner: either “1” or “0” for each bit.
On the contrary, imagine the same coin tossed in the air before
falling, and you want to measure its outcome.
Possible outcomes of a "Quantum computer" 
Possible outcomes of a "Classical Computer" 
Applications of Quantum Computers:

More Secure Finance: “Quantum uncertainty could be used to
create private keys for encrypting messages sent from one location to another
so that hackers could not secretly copy the key perfectly because of quantum
uncertainty”, Says
Prof. Sohini Ghose.
They would have to break the laws of Quantum Physics to hack the key. In a classical computer, the data exists in the form of bits. So it is easier to extract the keycodes of the encrypted data. The data in a quantum computer are in the form of qubits. So it can be in any random state which will make it impossible to extract the actual key.
They would have to break the laws of Quantum Physics to hack the key. In a classical computer, the data exists in the form of bits. So it is easier to extract the keycodes of the encrypted data. The data in a quantum computer are in the form of qubits. So it can be in any random state which will make it impossible to extract the actual key.

Medical Applications: It can be used
to discover new medicines and materials. While developing a drug, The most
difficult part is to understand the complexities of molecules at the quantum level.
But a Quantum computer can untangle the complexity of molecular and chemical
interaction leading to the discovery of new medicines and materials.
"Supercomputer" at IBM 
“Every time I add a quantum bit to a quantum computer, I double
the computational power. If I could have
300 qubits, that would be more powerful than all the computers in the world
connected together.” says Prof. Michelle Simmons, Professor of Quantum
Physics in the Faculty of Science at the University of New South Wales.
Conclusion:
Quantum Computers are definitely
going to be the computers of the future. Every year, Lots of data are produced
by us on earth that are stored in the form of clouds, hard disks, pen drives
etc..With the increasing amount of data, It is getting difficult to process
such large amount of data on the processors based on transistors. The quantum
computers are capable of handling and processing a large amount of data which are
very helpful even in day to day life. From its medical applications to weather
forecasting, Quantum computers come with an ocean of opportunities. It can be
used to protect the frauds in banking systems. There are also promising quantum
encryption methods being developed using the oneway nature of quantum
entanglement.
With such inventions, there are also
some problems which our existing
systems can face in the starting phase of implications of Quantum Computers. Since
Quantum computers are very powerful and fast, it is a cakewalk for it to
hack the security systems existing in the world today. Also, Due to its
operation at the quantum level, these computers produce lots of noise while
working. So the chances of getting errors are high. These computers are also
not very userfriendly and are difficult to operate by a nontechnical person.
A quantum powered computer is a completely new technology. Hence, even after these limitations, there is
a lot more which is unexplored which is exciting.
Latest News :
1.
'Forbidden' lightwave tool could
lead to 'crazyfast' quantum computers
Researchers
working to overcome one of the biggest bottleneck developments for future
quantum computers have achieved something
Source: Sillicon Republic
2. IBM brings its Quantum computer program to 16 African universities
IBM launched its Quantum computer program in Africa today, announcing a partnership with South Africa's Wits University that will extend to 15
Source: Tech Crunch
👍👍 beautifully explained
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