Qiskit is an open source framework of Quantum Computing. It provides tools for creating and manipulating quantum programs and running them on prototype quantum devices on IBM Q Experience or on simulators on a local computer.

1. Introduction
To Qiskit
Shadab Hussain
Quantum Computing India
https://shadabhussain.com

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Quantum Properties
Three quantum mechanical properties —
Superposition
Superposition refers to a
combination of states we would
ordinarily describe independently. To
make a classical analogy, if you play
two musical notes at once, what you
will hear is a superposition of the
two notes.
Entanglement
Entanglement is a famously counter-
intuitive quantum phenomenon
describing behavior we never see in
the classical world. Entangled
particles behave together as a
system in ways that cannot be
explained using classical logic.
Interference
Finally, quantum states can undergo
interference due to a phenomenon
known as phase. Quantum
interference can be understood
similarly to wave interference; when
two waves are in phase, their
amplitudes add, and when they are
out of phase, their amplitudes cancel.

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From Bits to Qubits
Quantum bit (Qubit):

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0
From Bits to Qubits
1

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From Bits to Qubits
|1⟩|0⟩
|0⟩ + |1⟩

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Properties that make QC Different
• Superposition
Exponential speedups as number of qubits grow
• Entanglement
Spooky action at a distance.
• Reversible computing
10-15W vs 20kW
• Privacy (No-cloning theorem)

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Quantum Algorithms
● Shor’s factorization algorithm
● Grover’s search algorithm
● Deutsch - Jozsa algorithm
● HHL algorithm - Useful in the NISQ era (these are mostly hybrid algorithms)
● QAOA - Quantum Approximate Optimization Algorithm
● VQE - Variational Quantum Eigen-solver

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Problems
● Hard to build and retain qubits due to decoherence
● High amount of noise
● Need for better quantum algorithms (Optimization)
● Algorithms like Shor’s can’t be implemented today
● All hardwares have their own pros and cons
● Data storage?
● Debugging?

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Categories
Quantum Mechanics
Quantum Information
Quantum
Computation
Gate based Annealing , ...
Quantum
Cryptography
Information Theory
Quantum Key
Distribution
Quantum Error
Correction

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Pauli - X gate
● Similar to
classical NOT
● Flips |0> to |1>
and vice versa

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Hadamard (H) Gate
Puts any state in an
equal superposition
of basis states (phase
will vary)

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CX/CNOT
● (If…then) -- XOR?
● If (control = 1)
{
Then flip target qubit
}

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Qiskit
• SDK for working with Noisy Intermediate-Scale Quantum (NISQ) Computers
• Apache 2.o License
• Designed to be backend agnostic
• Includes out-of-the-box local simulators and support for running on IBMQ

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Qiskit Terra
A solid foundation for Quantum Computing

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About Terra
Qiskit Terra provides the
foundational roots for our software
stack. Within Terra is a set of tools
for composing quantum programs at
the level of circuits and pulses,
optimizing them for the constraints of
a particular physical quantum
processor, and managing the batched
execution of experiments on remote-
access backends. Terra is modularly
constructed, simplifying the addition
of extensions for circuit optimizations
and backends.

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Qiskit Aqua
Algorithms for quantum computing applications

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About Aqua
Qiskit Aqua contains a library of
cross-domain quantum algorithms
upon which applications for near-
term quantum computing can be
built. Aqua is designed to be
extensible, and employs a pluggable
framework where quantum
algorithms can easily be added. It
currently allows the user to
experiment on chemistry, AI,
optimization and finance applications
for near-term quantum computers.

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Qiskit Ignis
Understanding and mitigating noise in
quantum systems

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About Ignis
Qiskit Ignis is a framework for
understanding and mitigating noise in
quantum circuits and systems. The
experiments provided in Ignis are
grouped into the topics of
characterization, verification and
mitigation. Characterization
experiments are designed to measure
noise parameters in the system.
Verification experiments are designed
to verify gate and small circuit
performance. Mitigation experiments
run calibration circuits that are
analyzed to generate mitigation
routines that can be applied to
arbitrary sets of results run on the
same backend.

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Qiskit AER
A high performance simulator framework
for quantum circuits

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About Aer
Qiskit Aer provides a high
performance simulator framework for
the Qiskit software stack. It contains
optimized C++ simulator backends
for executing circuits compiled in
Qiskit Terra, and tools for
constructing highly configurable
noise models for performing realistic
noisy simulations of the errors that
occur during execution on real
devices.

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100K
Unique Users
6 Million
Experiments Run
130
Scientific Papers

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Thank You