This document presents a presentation on quantum computing prepared by Mohammad Altaf Alam. It introduces quantum computing as computing based on quantum theory that explains energy and matter on an atomic and subatomic level. It discusses the history of quantum computing from Feynman's proposal in 1982 to developments in the 1990s. It defines a quantum computer as a machine that performs calculations based on quantum mechanics using qubits that can represent 0, 1, or both values simultaneously. The document compares classical bits that represent only 0 or 1 to qubits and explains how quantum computers use superposition and operate on multiple values at once. It outlines potential applications in cryptography, databases, artificial intelligence, and more. In conclusion, the author states that if quantum computers

1. PRESENTATION ON QUANTUM
COMPUTING
PREPARED BY
MOHAMMAD ALTAF ALAM
ROLL NO-00000
ELECTRICAL DEPARTMENT

2. Contents:
 Introduction of quantum computing?
 History of quantum computing?
 What is quantum computer?
 How quantum computer works?
 Why quantum theory in computing?
 The difference between digital computer and quantum computer
 What is classical bits?
 What is a qubit?
 The difference between classical bits and qubits.
 What is the future of quantum computing?
 Applications
 Conclusion

3. What Is Quantum Computing?
Quantum computing is the area of study of focused on developing
computer technology based on the principles of quantum theory,
which explains the nature and behaviour of energy and matter on
the quantum atomic and subatomic level.
Computers based on this theory are so smaller and faster then
digital computers

4. History
 1982- Feynman proposed the idea of creating machins based on the laws
of quantum mechanics instead of the laws of classical physics.
 1985-David Deutsch developed the quantum turing machine, showing that
quantum circuits are universal.
 1994-Peter Shor came up with a quantum algorithm to factor very large
numbers in polynomial time.
 1997-Lov Grover develops a quantum search algorithm with O(√ N)

5. A quantum computer is a machine that
performs calculations based on the laws of
quantum mechanics, which is the behaviour of
particles at the sub-atomic level. A Quantum is
a smallest possible discrete unit of any
physical property Quantum Computing.
Computing depends on principle of quantum
theory.
What Is Quantum Computer?

6. How quantum computer works?
In a 3-bit register of a classical computer one of the eight
numbers can be stored, but in a quantum register all eight
numbers can be stored in one register at the same time and
operated on simultaneously.

7. Why quantum theory computing?
Classical (Newtonian) Mechanics deals with microscopic system while
Quantum Mechanics deals with microscopic system-atomic and
subatomic level.
Computer system/components are becoming smaller and smaller from
mechanical computer to vacuum tubes, to transistors then to IC’s that
classical theory fails to explain.
Thus Quantum theory becomes essential.

8. The differences…
Digital Computer
Transistors
Bits-binary digits (0 or 1)
Silicon chip
Slower speed
Quantum Computer
Quantum mechanical
phenomena
Qubits- (0,1 or both together)
Atoms
Faster speed

9. Classical bits
 The basic component of classical computer is the bit, a single binary
variable of value 0 or 1.
 The state of a classical computer is describe by some long bit string
of 0s and 1s.
00010101101101010001101110110…..

10. What is a Qubit ?
 A qubit is a quantum bit. As a bit is the basic unit of
information in a classical computer, a qubit is the basic
unit of information in a quantum computer.
 In Quantum Computing, a qubit or quantum bit is a unit
information.

11. Classical bit Vs Qubits
Bits
1. The device computer
manipulating those bits with the
help of logical gates.
2. A classical computer has a
memory made up of bits, where
each bits holds either a one or a
zero.
Qubits
1. The device computer by
manipulating those bits with the
help of quantum logic gates.
2. A qubits can hold a one a zero or
crucially a superposition of
these.

12. What is the future of quantum computing
 Health
 Finance
 Computing
 Space

13. Applications
 Quantum computer can be used in cryptography.
 Modelling and indexing of very large databases.
 Artificial intelligence.
 It can be used to solving complex mathematical problems.
 Improved error correction and error detection.
 Quantum communication.

14. Conclusion…
• If we built this computer then it would revolutionized our human
society….
• Wide range of applications….

15. THANK YOU!!!