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IntroductionTo QiskitShadab HussainQuantum Computing Indiahttps://shadabhussain.com

https://shadabhussain.com Quantum Computing India 2

https://shadabhussain.com Quantum Computing India 4Quantum PropertiesThree quantum mechanical properties —SuperpositionSuperposition refers to acombination of states we wouldordinarily describe independently. Tomake a classical analogy, if you playtwo musical notes at once, what youwill hear is a superposition of thetwo notes.EntanglementEntanglement is a famously counter-intuitive quantum phenomenondescribing behavior we never see inthe classical world. Entangledparticles behave together as asystem in ways that cannot beexplained using classical logic.InterferenceFinally, quantum states can undergointerference due to a phenomenonknown as phase. Quantuminterference can be understoodsimilarly to wave interference; whentwo waves are in phase, theiramplitudes add, and when they areout of phase, their amplitudes cancel.

https://shadabhussain.com Quantum Computing India 9From Bits to QubitsQuantum bit (Qubit):

https://shadabhussain.com Quantum Computing India 100From Bits to Qubits1

https://shadabhussain.com Quantum Computing India 11From Bits to Qubits|1⟩|0⟩|0⟩ + |1⟩

https://shadabhussain.com Quantum Computing India 12Properties that make QC Different• SuperpositionExponential speedups as number of qubits grow• EntanglementSpooky action at a distance.• Reversible computing10-15W vs 20kW• Privacy (No-cloning theorem)

https://shadabhussain.com Quantum Computing India 13Quantum 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

https://shadabhussain.com Quantum Computing India 14Problems● 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?

https://shadabhussain.com Quantum Computing India 15CategoriesQuantum MechanicsQuantum InformationQuantumComputationGate based Annealing , ...QuantumCryptographyInformation TheoryQuantum KeyDistributionQuantum ErrorCorrection

https://shadabhussain.com Quantum Computing India 16Pauli - X gate● Similar toclassical NOT● Flips |0> to |1>and vice versa

https://shadabhussain.com Quantum Computing India 17Hadamard (H) GatePuts any state in anequal superpositionof basis states (phasewill vary)

https://shadabhussain.com Quantum Computing India 18CX/CNOT● (If…then) -- XOR?● If (control = 1){Then flip target qubit}

https://shadabhussain.com Quantum Computing India 19Qiskit• 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

https://shadabhussain.com Quantum Computing India 22Qiskit TerraA solid foundation for Quantum Computing

https://shadabhussain.com Quantum Computing India 23About TerraQiskit Terra provides thefoundational roots for our softwarestack. Within Terra is a set of toolsfor composing quantum programs atthe level of circuits and pulses,optimizing them for the constraints ofa particular physical quantumprocessor, and managing the batchedexecution of experiments on remote-access backends. Terra is modularlyconstructed, simplifying the additionof extensions for circuit optimizationsand backends.

https://shadabhussain.com Quantum Computing India 24Qiskit AquaAlgorithms for quantum computing applications

https://shadabhussain.com Quantum Computing India 25About AquaQiskit Aqua contains a library ofcross-domain quantum algorithmsupon which applications for near-term quantum computing can bebuilt. Aqua is designed to beextensible, and employs a pluggableframework where quantumalgorithms can easily be added. Itcurrently allows the user toexperiment on chemistry, AI,optimization and finance applicationsfor near-term quantum computers.

https://shadabhussain.com Quantum Computing India 27Qiskit IgnisUnderstanding and mitigating noise inquantum systems

https://shadabhussain.com Quantum Computing India 28About IgnisQiskit Ignis is a framework forunderstanding and mitigating noise inquantum circuits and systems. Theexperiments provided in Ignis aregrouped into the topics ofcharacterization, verification andmitigation. Characterizationexperiments are designed to measurenoise parameters in the system.Verification experiments are designedto verify gate and small circuitperformance. Mitigation experimentsrun calibration circuits that areanalyzed to generate mitigationroutines that can be applied toarbitrary sets of results run on thesame backend.

https://shadabhussain.com Quantum Computing India 29Qiskit AERA high performance simulator frameworkfor quantum circuits

https://shadabhussain.com Quantum Computing India 30About AerQiskit Aer provides a highperformance simulator framework forthe Qiskit software stack. It containsoptimized C++ simulator backendsfor executing circuits compiled inQiskit Terra, and tools forconstructing highly configurablenoise models for performing realisticnoisy simulations of the errors thatoccur during execution on realdevices.

https://shadabhussain.com Quantum Computing India 32100KUnique Users6 MillionExperiments Run130Scientific Papers

https://shadabhussain.com Quantum Computing India 34Thank You

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