Reduce Decoherence. Increase Fidelity. Take Control.

Q-CTRL presents BLACK OPAL Play Video

Trusted By

Rigetti Computing

Media View All

18 Apr 19

Sydney start-up Q-CTRL launches open source quantum error suppression library

12 Apr 19

CEO & Founder, Q-CTRL | Award-winning experimental quantum physicist | TEDx Speaker | Professor o...

5 Apr 19

Bridging the research commercialisation gap

30 Mar 19

University research: Brains and cash need better forum

Extract maximum performance from your quantum hardware

We help teams solve the hardest problem in quantum technology - hardware error and instability - using the power of quantum control

Click and Drag

Deploy solutions that really work

Create lab-validated, drop-in replacements for single and multiqubit gates to improve fidelities and coherent lifetimes by orders of magnitude.

Learn More
Best in class controls that work.

Access the newest control solutions, fast

New features are pushed weekly, giving you access to control solutions that are right for your needs faster than ever before.

Learn More
Latest control solutions

Perform like a pro, even if you're just a beginner

Get up to speed quickly by leveraging modern, beautiful tools designed to help you build intuition and deploy advanced controls.

Learn More
Edit noise with ease

Trust best-in-class development standards

Q-CTRL’s products are professionally developed, tested, and documented software running on a modern cloud-compute architecture.

Learn More
Simple, easy to use in app help and documentation
Alexei Marchenkov, Bleximo

BLACK OPAL helps our team directly leverage Q-CTRL’s deep expertise in quantum control to solve some of our toughest problems building a new class of application-specific quantum computers.

This software - and its focus on high-quality visualizations - enables us to build intuition for very complicated concepts outside of our core areas of expertise.

Alexei Marchenkov CEO Bleximo

Open Controls

View on Github

Open Controls is an open-source Python package that makes it easy to create and deploy established error-robust quantum control protocols from the open literature. The aim of the package is to be the most comprehensive library of published and tested quantum control techniques developed by the community, with easy to use export functions allowing users to deploy these controls on:

  • Custom quantum hardware
  • Publicly available cloud quantum computers
  • The Q-CTRL product suite

Anyone interested in quantum control is welcome to
contribute to this project

Getting Started

$ pip install qctrl-open-controls
Example of using it in a console:
>>> from qctrlopencontrols import new_predefined_dds
>>> cpmg_4 = new_predefined_dds(
>>> print(cpmg_4)
Duration = 1e-05
Offsets = [0.0,0.125,0.375,0.625,0.875,1.0] x 1e-05
Rabi Rotations = [0.0,1.0,1.0,1.0,1.0,0.0] x pi
Azimuthal Angles = [0.0,0.5,0.5,0.5,0.5,0.0] x pi
Detuning Rotations = [0.0,0.0,0.0,0.0,0.0,0.0] x pi

Discover Our Products

Find out more


Embedded Solutions

Integrate quantum control in professional python workflows, cloud systems, or your own customized quantum computer hardware.


Build and export

Build and export intuitive visualizations of the toughest concepts in quantum computing.


Aerospace & Defense

Extract the most - and most useful - information from quantum sensors

Q-CTRL provides lab-validated tools for many industries

Our solutions allow you to do more with your quantum coherent hardware, from computing and sensing through to medical imaging.

Contact Us


Suppress and virtualize qubit errors to extract maximum performance from your hardware today, and improve the efficiency of quantum error correction tomorrow.

Industrial Chemistry
and Research

Power a new class of EPR and NMR controls for analytic chemistry and materials science and access new regimes in quantum physics experiments through dynamic control.

Defense and

Extract the most useful information from quantum-enhanced sensors in tight-SWAP applications and improve the performance of embedded quantum-enabled systems like clocks.

Health and

Develop new medical imaging protocols for MRI using pulse sequences which augment contrast weighting. Expand your toolkit to include novel analytic capabilities such as frequency-selective controls.

Get Started

Take control of your Quantum Future

Start Your FREE Trial
Media View All
  • 18 Apr 19

    Sydney start-up Q-CTRL launches open source quantum error suppression library

    Read More
  • 12 Apr 19

    CEO & Founder, Q-CTRL | Award-winning experimental quantum physicist | TEDx Speaker |...

    Read More
  • 5 Apr 19

    Bridging the research commercialisation gap

    Read More