Yachay Scientific Computing Group Summer School 2021.

1. Introduction to Quantum Computing with Qiskit
Yachay Scientific Computing Group
Day 3
Sakibul Islam Sazzad
Artificial Brain Lab, Quantum Developer
Website: https://sites.google.com/view/sakibulislamsazzad
Email: sakibulislamsazzad@gmail.com

2. Table of contents
● Quantum Mechanics and Quantum Computing
● Postulates for Quantum Computing
Bra-Ket Notation
Operator (Hermitian)
Measurement
Reversible Computing (Unitary, Landauer’s Principle)
● Qiskit

3. A quantum state is represented by a |Ψ > [ket] state

6. Any physical observable is defined by a Quantum Operator
• Measurement operator are Hermitian and it’s a eigen value of a operator
• After measuring a quantum state, it collapses. So cant duplicate [No cloning theory]

9. Quantum System evolves with time [Unitary property]
• Reversible Circuit:
• Input Quantum Operation Output Same Q.O Output
• Landauer’s Principle: A bit of information erase will increase entropy [Reversible
Circuit]

10. Quantum Mechanics
Superposition
A quantum state can be at two position
simultaneously
𝐻 =
1 1
1 − 1
H

11. Entanglement
• Correlation between two objects
• If two quantum states A and B are
non-separable then it is entangled
|𝜑00
> =
1
2
(|00 > +|11 >)
|𝜑10
> =
1
2
(|00 > _ |11 >)
H

13. Interference