What is Quantum Machine Learning, and Is It A Thing?

| ML4ALL Conference 2019

In the rush to add the word _quantum_ to everything from batteries to banking, Quantum machine learning has entered the fray. A perfect combination of buzzwords that will get all of the funding....right? In this talk I want to look at: quantum computers are and how you program one. With this context, we can look at what machine learning tasks are being explored for possible speedups with quantum computing.

What is Quantum Machine Learning, and is it a Thing?

#ML4ALL | 30 April 2019

Sarah Kaiser
Pensar Development

diagram of hardware for quantum computer

Data model for quantum computers

Quantum + bits = QUBITS!

To represent the state of $n$ qubits, we use a complex valued vector $2^n$ elements long, called a ket.

$$|x_{n}\rangle = \begin{bmatrix} \alpha_{1}\\ \alpha_{2}\\ \alpha_{3}\\ ...\\ \alpha_{2^n}\end{bmatrix}$$

Example: 2 qubit register

To represent the state of 2 qubits, we use a complex valued vector $2^2 = 4$ elements long.

$$|💖\rangle = \begin{bmatrix} 0\\ \frac{1}{\sqrt{2}}\\ \frac{-i}{\sqrt{2}} \\ 0 \end{bmatrix}$$

TL;DR on quantum computing

  • Quantum computers are not universally faster or more powerful. Think like GPUs!

  • The applications that are exciting in the near term are not necessarily the ones hyped.

  • We can start today programming and playing around with early hardware and simulators!

# 💖 Q# 💖 #
software stack for a Q# program


Code here: GitHub

Quantum Neural Nets

diagram of a restricted boltzmann machine
  • We can train restricted Boltzmann machines faster on a quantum computer
  • Encoding the problem in qubits is a problem, need qRAM to make useful

For more look here: Quantum Machine Learning


  • Keep it real* when reading about quantum computing 😎

  • Quantum resources necessitate changing how we think about algorithms

  • Quantum machine learning is exciting, but very alpha

More on QML from Quantum Model Zoo

More fun stuff I do: