This is the *start* of a list of links to quantum computing companies, with selected quotes (in italics) from their websites.  Please send any suggestions for additions using the Contact form.

Alibaba – Chinese company running 11-qubit cloud computing service see this article from South China Morning Post

Baidu – Chinese company investing $15bn in next gen tech including quantum and AI. See this article on TechNode

Google – Quantum AI“Quantum computing is the design of hardware and software that replaces Boolean logic by quantum law at the algorithmic level. For certain computations such as optimization, sampling, search or quantum simulation this promises dramatic speedups. We are particularly interested in applying quantum computing to artificial intelligence and machine learning.”  Developers of the 72-qubit Bristlecone chip

IBM-Q“IBM Q is an industry-first initiative to build commercially available universal quantum computers for business and science.”..”IBM Q scientists continue to make significant progress across the entire quantum computing technology stack, including a new prototype 50 qubit processor, a 20 qubit processor online for client use, expanded QISKit developer tools, and new resources for the IBM Q Experience.”

Microsoft“The only scalable quantum solution – In order to empower the quantum revolution and widely welcome customers, developers, and enthusiasts, we need a system that scales. Unlike other quantum systems built on a fragile, error-prone foundation, every component of our infrastructure is designed for scalability. Our approach uses topological qubits specifically for their higher accuracy, lower cost, and ability to perform long enough to solve complex real-world problems.”

Intel – (don’t seem to have a dedicated quantum computing site – here is their Press Kit which says “In 2015, Intel established a collaborative relationship with QuTech to accelerate advancements in quantum computing. The collaboration spans the entire quantum system — or “stack” — from qubit devices to the hardware and software architecture required to control these devices as well as quantum applications. All of these elements are essential to advancing quantum computing from research to reality.”

Rigetti“Rigetti Computing is a full-stack quantum computing company. We design and manufacture superconducting quantum integrated circuits. We package and deploy those chips in a low temperature environment, and we build control systems to perform quantum logic operations on them. We build software to integrate our systems directly into existing cloud infrastructure. We believe the first useful quantum computers are within reach, and we believe quantum computing has the potential to one day have an enormous positive impact on humanity. To help realize that vision, we also develop new algorithms for quantum computing, with a focus on near-term applications in computational chemistry and machine learning.”

Cambridge Quantum Computing (CQC) “Cambridge Quantum Computing (CQC) is an independent company combining expertise in Quantum Information Processing, Artificial Intelligence, Optimisation and Pattern Recognition. We design solutions that will benefit from quantum computing even in its earliest forms, and we have thus developed technologies that are realisable with classical computing and, in the future, with quantum computing.”

D-Wave“Founded in 1999, D-Wave Systems is the world’s first quantum computing company and the leader in the development and delivery of quantum computing systems and software. Our mission is to unlock the power of quantum computing to solve the world’s most challenging problems. Our systems are being used by world-class organizations and institutions including Lockheed Martin, Google, NASA, USC, USRA and Los Alamos National Laboratory. D-Wave has been granted over 140 U.S. patents and has published over 90 peer-reviewed papers in leading scientific journals.”

QC Ware“QC Ware develops hardware-agnostic enterprise software solutions running on quantum computers. The company was founded in 2014 by a world-class team of aerospace and finance professionals, physicists, computer scientists, and quantum algorithm experts. We have signed multiple partnerships with Fortune 500 enterprises, NASA, USRA and other government agencies. The company’s investors include Airbus Ventures, the D.E. Shaw Group, and Alchemist Accelerator. We are based in Palo Alto, CA.”

Q-Ctrl – Australian company who will provide quantum control solutions, that is a spin-off company from the University of Sydney’s Quantum Science Group.  See 7th November 2018 – Venture capital is backing Australian research into quantum computingBusiness Insider Australia

1QBit“Our Mission: To apply breakthroughs in computation to machine intelligence and optimization science through a widely accessible, hardware-agnostic software platform.”…”1QBit was founded by a group of intellectually curious entrepreneurs and researchers during the early stages of commercial quantum computing. We recognized the possibilities quantum computers were about to unlock, and embarked on building the expertise and technology required to connect industry problems to this new hardware. Over the past four years, 1QBit has grown into a globally respected team of experts dedicated to taking quantum computing from theory to application, and continues to attract global talent in mathematics, engineering, physics, chemistry, operations research, and software development.”

Atos – Digital services company that is a “trusted partner for you Digital Journey” On 4th July 2017 announced in this Press Release Atos launches the highest-performing quantum simulator in the world – a simulator called the “Atos Quantum Learning Machine” that can simulate 30 to 40 qubits.  Is meant to be used for people to develop and test quantum algorithms in advance of real hardware being available and runs on a supercomputer.

Strangeworks – company aiming to make quantum computing accessible, founded by William Hurley (otherwise know as Whurley, see the Wikipedia page)