This repository contains my solutions to the exercises of IBM Quantum Spring Challenge 2023.

Contents:

Lab 1: Intro to Dynamic Circuits

This lab consists of simple exercises where you will create small circuits to understand what dynamic circuits are and how they work. There will be also exercises about dynamic circuit gates that simulate the classical if statement. Finally we’ll introduce you to the "repeat until success" method.

Lab 2: Quantum Teleportation

In this lab we’ll be sending a quantum message from one person to another. The only issue? Once a superposition is observed, the message is destroyed. This lab walks through the theory behind that problem, and the clever solution called Teleportation.

Lab 3: Iterative Phase Estimation

Iterative Phase Estimation (IPE) is a variant of the phase estimation algorithm which requires the use of only one auxiliary qubit. Because it requires mid-circuit measurements and classical feedforward operations, IPE could not be executed on IBM Quantum hardware before the introduction of dynamic circuits. In this lab, we will use the newly introduced dynamic circuits capabilities to implement IPE.

Lab 4: Quantum Error Correction

In this lab we’ll dive into Error Correction, starting from how it’s used on classical data, and then demonstrating (some of) our approach for quantum computers. We’ll explore how to use a bit flip code, and conclude with a conversation about how to run error correction on a real device.

Lab 5: 127Q System

In the final lab we’ll explore how to combine our knowledge of dynamic circuits and error correction to create a GHZ state on one of IBM’s 127-qubit processors. You will try to modify the GHZ state with additional qubits as stabilizers. Please have patience, no one has ever offered a quantum computer of this type to the public before!

The grader and the access to real devices- ibm_peekskill and ibm_sherbrook will not work after the completion of the challenge, i.e after 24 May 2023 5PM ET.