Andrew White from the quantum technology laboratory at the University of Queensland, Australia, maintains an excellent web page listing conferences related to quantum technology around the world.   You can find his most recent listing for 2020 conferences here.

Harrisburg University maintains a web page called Quantumapalooza which provides a listing of free online learning opportunities for the Quantum Computing community.

In addition to the conferences shown on the list mentioned above, here are some additional conferences:

The Brookhaven National Laboratory will hold a series of three Quantum InnovationXLab Virtual Series webinars covering the application of quantum technologies in three different application segments. The first will be held on August 26, 2020 and will discuss how quantum technology is set to transform life sciences in the coming decades. The second will be on September 10, 2020 and will discuss how how a nationwide quantum Internet may impact the financial sector, and the third one will be on September 30, 2020 and will discuss quantum impact on Global Communications, Transportation, and Navigation.

Cambridge Quantum Computing will be hosting an online Quantum Week of Fun conference on September 21-25, 2020. It will bring together researchers from academia and the quantum computing industry with the goal of cross fertilization between different areas of the field. The workshops will contain both invited talks from leading scientists and contributed talks covering the latest research.  The week will have four workshops presented on different days consisting of the following:

An International Workshop on Quantum Computing and Quantum Engineering organized by the Black Sea Universities Network (BSUN) will occur on September 21-25, 2020. The conference will cover topics including quantum information processing, quantum sensing, and quantum communications. Participation is free and the workshop will be held both online and face to face in Çanakkale, Turkey.

D-Wave will be hosting a virtual Qubits Worldwide Users Conference on September 28-29, 2020 for North America/Europe and on September 30 in Japan. This is an annual conference which features speakers presenting their latest work on quantum applications using the D-Wave quantum annealer in logistics, materials science, healthcare, machine learning, financial modeling, and more. Speakers from D-Wave will discuss their next generation quantum systems and software. 

Informa will be holding another Virtual Quantum Computing Summit Silicon Valley as part of The Virtual AI Summit Silicon Valley on September 29-30, 2020. The summit has been designed to provide business, technical, research, academic and innovation insight, qualified via application-based quantum experiences to showcase how quantum is delivering real business value, drive process efficiency and cost optimization.

The Women in Quantum Summit II will be held as a virtual event on September 29th, 30th, and October 1st.  This will be a follow-on from the first Women in Quantum Summit held in July. The web site for registration can be found here.

The conference on Quantum Annealing / Adiabatic Quantum Computing will be held at the International Center for Theoretical Physics in Trieste, Italy on October 5-6, 2020. The conference will deal with academic and basic research on quantum annealing and adiabatic quantum computation with a broad focus including quantum approximate optimization (QAOA) and other variational quantum approaches and in close connection with the neighboring fields of Quantum Simulations and Quantum Computation.

The InnovationXLab Quantum Information Science & Technology Summit (QIST) organized by Brookhaven National Laboratory will be held as a virtual event on October 7-8, 2020.  It will connect leaders in the finance and banking, technology, communications, energy and materials sciences sectors to discuss how to accelerate QIST advancements that impact the nation and world.

The IEEE Quantum Week, also known as the IEEE International Conference on Quantum Computing and Engineering (QCE) will be held in Broomfield, Colorado on October 12-16, 2020. This conference aims to bring together quantum professionals, researchers, educators, entrepreneurs, champions and enthusiasts to exchange and share their experiences, challenges, research results, innovations, applications, pathways and enthusiasm on all aspects of quantum computing, engineering and technologies.

Quantum 2020, a free online event organized by the Institute of Physics (IOP), Chinese Physical Society, and University of Science and Technology of China (USTC) will be held on October 16-22, 2020. Themes covered by Quantum 2020 will include Quantum communication, Quantum computing and quantum simulation, Quantum sensing, metrology and imaging, Quantum information theory, software and algorithms, Quantum foundations, and Quantum technology in industry.

The IQT Europe 2020 conference will be held as a week long virtual event on October 26-30, 2020 and will be focus on the practicalities of implementing quantum technology in the real world.  The conference will be produced by Inside Quantum Technologies, QuTech and 3DR Holdings as their second annual European conference. The European orientation of this conference is reflected in many of the speakers who will come from both the leading European multinationals as well as European based quantum startups. There will also be speakers from both the EU and individual European governments.

The Quantum Technology International Conference 2020 (QTech 2020) will be held in Barcelona, Spain on November 2-4, 2020. The objectives of the conference is to present the latest developments of quantum technologies in the domains of quantum communication, computation, simulation, sensors and metrology, and their implementation using various platforms from atoms and ions to solid states, superconducting circuits and optics.

Because the 2nd European Quantum Technologies Conference (EQTC) has been postponed to 2021, the Quantum Flagship is planning an online event called European Quantum Week on November 2-6, 2020. Details will be posted when further information is available.

The Quantum Partnerships Forum, organized by Kisaco Research, will be held on November 10-12, 2020. It will focus on creating and growing key partnerships within the quantum computing ecosystem. The inaugural forum in 2020 will be a virtual event and center around the themes of commercialization and supply chain. Similar to an ‘exchange’ format, forum attendees are expected to fill out profiles in order to increase the effectiveness of networking. The structure and content of the event emphasizes networking and the formation and dynamics of partnerships over product pitches, updates, and industry timelines.

The First International Workshop on Quantum Computing Software will be held online in conjunction with the Supercomputing (SC20) conference on November 11, 2020. The workshop will explore the innovative software needed to make quantum computing practical and accessible. It will focus heavily on the tools and software for quantum computing with particular emphasis on realized implementations.

The Quantum Techniques in Machine Learning (QTML 2020) conference will be held in Boston, Massachusetts on November 9-12, 2020. The conference will be set up to allow for online talks and attendees and may possibly also allow for physical attendance depending upon conditions. This is an annual international conference focusing on the interdisciplinary field of quantum technology and machine learning. The goal of the conference is to gather leading academic researchers and industry players to interact through a series of scientific talks focused on the interplay between machine learning and quantum physics.

The Q-turn workshop will be held as an online event from November 23-27, 2020.  It is a unique international quantum information workshop series with a core mission is to foster an inclusive community and highlight outstanding research that may be under-appreciated in other high-impact venues due to systemic biases.

The Quantum Communications and Information Technology (QCIT’20) workshop will be held as part of the IEEE Globecom’20 conference in Taipei, Taiwan on December 7-11, 2020. The workshop will cover recent experimental results which confirm feasibility of real applications in quantum communications, computing, security, and sensing. On the scientific side, it will also address novel ideas in the fields of quantum communications and information processing, which contribute to the general know-how of quantum technologies.

The fourth annual Q2B Conference presented by QCWare will be held as a virtual event on December 8-10. The conference will include business & technical education, thought leadership & announcements, and the latest on research and future direction.

Quantum.Tech London will be held on April 12-14, 2021. The conference will cover covering quantum computing, sensing & metrology, communications & cryptography, hardware, devices and technology applications.

Quantum.Tech Boston will be held on June 21-23, 2021. The conference will cover covering quantum computing, sensing & metrology, communications & cryptography, hardware, devices and technology applications.

The Second European Quantum Technology Conference (EQTC) has been postponed until November 29, 2021 to December 3, 2021 but will still be held in Dublin, Ireland.  This will be a follow-on to the first EQTC conference held in Grenoble, France in 2019. EQTC 2021 will provide full coverage of the most prominent and recent advances in European and International quantum technology activities across basic sciences, communication, computing, simulation and sensing/metrology. The conference program addresses a wide range of topics in quantum technologies including fundamental science, infrastructure development, industry engagements, education & training, encouraging and facilitating gender balance in the quantum community, international cooperation, and policy-making. It will provide a forum to highlight the state-of-the-art in quantum technologies both in Europe and from around the world.