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Solutions of the QHack 2023 Quantum Coding Challenges

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Introduction

Hi, these are my solutions to the QHack 2023 quantum machine learning hackathon.
Everything is coded in Xanadu's PennyLane quantum programming package.

Hackathon Details

Site: QHack.ai
Date: February 2023

Score

Here is a screenshot of my completed hackathon scoreboard entry.
I ranked 24th in terms of cumulative completion time for the problem sets.
Scoreboard

And here is accompanying certificate
Certificate

Files

There are several challenges, each in the form of a self-contained .ipynb in the ipynb folder.
These challenges also have an overarching storyline, as introduced in coding_metastory.md, which flow from the notebook 1.1 to 1.2, 1.3, ..., 1.5, 2.1, ...
They are also html copies in the html folder.

Topics

  1. Tutorial Challenges
    1. 0.1-It Adds Up-jupyter notebook
    2. 0.2-Affairs of State-Quantum States
    3. 0.3-A Shor Thing-Shor Code
    4. 0.4-Product Management-Product States
    5. 0.5-Hi, Hydrogen!-VQE: Variational Quantum Eigensolver
    6. 0.6-Hamiltonian Sandwich-Hamiltonians
    7. 0.7-Optimize This-Quantum Machine Learning
    8. 0.8-Stuck in the Middle with U-Mid-Circuit Measurements
  2. Office Hijinks
    1. 1.1-Tick-Tock Bloch-Bloch Sphere
    2. 1.2-The Super Parameter-Expressibility of Circuit Ansatz
    3. 1.3-The Change of Qubit-Swapping States
    4. 1.4-The Lazy Colleague-Grover Search
    5. 1.5-The False Proof-Phases of Quantum States
  3. Bending Bennett's Laws
    1. 2.1-Ctrl-Z-Quantum AND Gate
    2. 2.2-Sub-Superdense Coding-Superdense Coding
    3. 2.3 Secrets in Spacetime-Quantum Encrypthon
    4. 2.4-A Halfway-Decent Photocopier-Quantum Teleportation
    5. 2.5-The Itch to Switch-Quantum Teleportation
  4. A Tale of Timbits
    1. 3.1-The Magic 5-Ball-Bernstein-Vazirani Algorithm
    2. 3.2-Cascadar-Tiffoli Gates
    3. 3.3-A Pauli-Worded Problem-Noise, Trace Distance
    4. 3.4-Entangled Robot Swarms-Quantum Teleporation
    5. 3.5-One-Bit Wonder-Timbits, Boolean Satisfiability Problem
  5. Fall of Sqynet
    1. 4.1-SqyTrotter-Trotterisation
    2. 4.2-Unitary Operators and Beyond-Sum of Unitaries
    3. 4.3-Don't Hit the Ground-Noise Modelling
    4. 4.4-Desperate Measures-Trotter Ising Model
    5. 4.5-Ising Uprising-VQE Ising Model

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