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 2021 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 24th Annual Conference on Quantum Information Processing (QIP 2021) will be held online from February 1-5, 2021. It  be hosted by the Technical University of Munich and the Munich Center for Quantum Science and Technology. QIP is an annual conference about quantum computation and information. Its goal is to represent the preceding year’s best research in the area, in the form of both invited and contributed talks.

The fourth Women in Quantum (WIQ) event will be held as a virtual event on March 2-4, 2021. It will spotlight female researchers, academics, entrepreneurs and investors in quantum technology to a global audience, as well as offering them a safe, dedicated community to collaborate and succeed. It will include a career fair, a quantum machine learning track and provide for one one networking.

The APS March Meeting 2021 will be held online from March 15-19, 2021. It will have multiple sessions devoted to Quantum Information, Concepts, and Computation. There will also be tutorials on Noisy Quantum Devices and Quantum Sensing held the day before on March 14, 2021.

Quantum Business Europe will be held as a virtual event on March 16-17, 2021. The event will bring together 50 speakers to inform attendees about the latest market trends, best practices and show concrete applications of quantum technologies

The 1st Workshop on Quantum Software Architectures (QSA) being held as part of the IEEE International Conference on Software Architecture (ICSA 2021) will occur on March 22, 2021. The goal of the QSA workshop is to bring together researchers and practitioners from different areas of quantum computing and (classical) software architecture to strengthen the quantum software community and discuss architectural styles and best practices of quantum software as well as other aspects of the quantum software development lifecycle. The hope is to hold the event in-person in Stuttgart, Germany, but may also be online or in a hybrid format depending upon the Covid-19 situation.

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.

IQT New York Online 2021 will be held as a virtual conference on May 17-20, 2021. This is Inside Quantum Technology’s fifth conference on the commercialization of quantum technology and will cover the business of Quantum Computing, Quantum Networking, Quantum Sensors, and Quantum Cryptography.

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 2nd International Workshop on Quantum Computing: Circuits Systems Automation and Applications (QC-CSAA) will be held in conjunction with the ISVLSI 2021 Conference in Tampa, Florida on July 7-9, 2021. The workshop will provide a comprehensive review on fundamentals as well as the current state of the art in research and technology. Its purpose is to explore design paradigms of quantum computing including developing a full stack from quantum algorithms to quantum chip. Advances in quantum computing hardware, software, and algorithms as well as contributions on the transformative research needed to guide quantum computing performance toward practical and sustainable operations will be aligned with the goal of this workshop. Further, circuits and systems targeting novel and existing applications of quantum computing to fields such as quantum chemistry, linear algebra, scientific applications, aerospace, material science, cryptography, machine learning, etc. will be of special interest.

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.