The Quantum Machine Learning Hackathon

QML Challenge Leaderboard

Build your skills by tackling a series of QML challenge questions for all skill levels

  • Compete against other teams on the leaderboard
  • Opens Feb 17
  • The top 80 teams in the challenge will receive credits to help them build their Open Hackathon solutions on AWS. Teams can apply credits to any AWS service, including Amazon Braket where they can showcase their ideas on Rigetti, IonQ, and D-Wave hardware or with high-performance simulators in the cloud

QHack Open Hackathon

Grand prize: summer internship at CERN*

  • A weeklong free-form hackathon
  • Show the world what you can do!
  • Opens Feb 22

*conditions apply

Access Sandbox's Floq Simulator

The top 50 teams in the challenge will each receive an API key for the alpha of Sandbox@Alphabet's Floq API.

  • Contestants from these teams will be able to develop and test their QML creations on Floq's TPU-based high-performance quantum simulator for the duration of the Open Hackathon portion of the contest.
  • The team with the best usage of Floq by the end of the Open Hackathon will be eligible to receive a $2500 cash prize.

Tell me more

Team names are unique. The only way to guarantee your favourite name in the QML Challenge web portal is to create an account and grab it early. If your team has multiple members, check if one of your teammates has already created an account.

We recommend a maximum team size of 3 people. Teams of 4+ may also be acceptable, but the CERN internship prize has a maximum of three positions available.

No. Individuals can take part in the hackathon challenges independently. There is no distinction on the scoreboard between teams of one or teams with multiple members. Attendees can also choose to follow our livestream content without taking on the hackathon challenges (though we encourage you to do so!).

Recruit friends, work colleagues, classmates, or put the call out in existing communities such as the PennyLane discussion forum, the Xanadu Slack, the Unitary Fund Discord, or the QOSF Slack.

Our hackathon challenges will be based on PennyLane and Amazon Braket.

We will not be sharing specific example questions before the event. To best prepare, the ideal source of example material is the PennyLane QML website.

Multiple hackathon questions will be available, with different levels of difficulty. It is up to you how much time you would like to put in; simply choose a question to start with, and go from there! There is no requirement to answer every question.

Check out the FAQs for more QHack questions and answers.
QHack is a meaningful, engaging, and respectful event. Please abide by our Code of Conduct.

Software stack


PennyLane is a cross-platform Python library for differentiable programming of quantum computers. Train a quantum computer the same way as a neural network.

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Amazon Braket

Amazon Braket is a fully managed quantum computing service that helps researchers and developers get started with the technology to accelerate research and discovery.

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QML Challenge Leaderboard and QHack Open Hackathon are subject to the QHack Terms & Conditions.