Semester page for FYS5419 - Spring 2025

Dear all, welcome back to FYS5419/9419. The plans this week are 

1. Reminder on basics of the VQE method and how to perform measurements for the simpler one- and two-qubit Hamiltonians

2. Simulating efficiently Hamiltonians on quantum computers with the VQE method and gradient descent to optimize the state function ansatz

3. Introducing the Lipkin model, our final model for project 1

4. For the exercise session, we continue to work on project 1

As reading suggestions we recommend

1. For the discussion of one-qubit, two-qubit and other gates, sections 2.6-2.11 and 3.1-3.4 of Hundt's book Quantum Computing for Programmers, contain most of the relevant information. 

2. The VQE algorithm is discussed in Hundt's section 6.11

3.  See the review of Till...

Dear all, welcome back to FYS5419/9419.  We hope you've had a great weekend, irrespective of the not optimal weather!

The plan this week is to discuss in detail the introduction and implementation of the VQE algorithm for a the one-qubit Hamiltonian of project 1 and prepare for the solution of the two-qubit Hamiltonian of the project 1.  We will discuss strategies and implementations as well as how to rewrite a given Hamiltonian in terms of various gates and transformations.  Next week we will also introduce a more realistic Hamiltonian and express again the Hamiltonian in terms of various Pauli matrices.

Plans for the week of February 24-28, Solving quantum mechanical problems

1. Repetition from last week on gates, measurements and one-qubit systems

2. Introducing the Variational Quantum Eigensolver (VQE) a...

Dear all, welcome back to FYS5419/9419. We hope you've all had a great weekend.

The plans for this week (see lecture notes either as PDF or jupyter-notebook at https://github.com/CompPhysics/QuantumComputingMachineLearning/tree/gh-pages/doc/pub/week5)

are:

The first part of the lecture will focus

1. Review from last week, one-qubit gates and one-qubit Hamiltonian (using slides from last week)

2. Reminder and review of density matrices and measurements from week 2

3. Schmidt decomposition and entanglement

4. Discussion of entropies, classical information entropy (Shannon entropy) and von Neumann entropy

The second part focuses on

1. Two-qubit Hamiltonians...