Quantum gate error reduction – materials and circuit architectures for superconducting quantum computers, a collaboration between Chalmers University, Sweden and Aalto University, Finland.
Come to the cutting edge of quantum technology – join our multi-talented, collaborative team working toward the common goal of building a 100-qubit quantum computer by 2025. You will be part of the most exciting things happening in this field, such as the Wallenberg Centre for Quantum Technology (WACQT) in Sweden, the Centre of Excellence Quantum Technology Finland (QTF), and the EU Flagship on Quantum Technology OpenSuperQplus.
Information about the project:
The reduction of quantum gate errors represents the most important problem in the development of quantum computers in any technological platform. By this metric, superconducting qubits constitute a leading platform, with the best demonstrated two-qubit gate errors currently at the 0.1-0.2% level. Meaningful quantum computing requires that these errors be reduced to 0.01% in a scalable and reliable way across the multi-qubit chip. These gate errors are limited by decoherence and by systematic control errors, which we address in two postdoc projects.
The postdocs working on this collaborative project are expected to spend 50-75% of their time at Chalmers, with substantial research visits to Aalto. The project is funded for 2 years by WACQT with the possibility of a 5-month ramp-up phase in 2022 funded by QTF.
Position 1 – Optimal control pulses for quantum computers
In a superconducting quantum processor, quantum gates are realized by on-resonant or near-resonant microwave pulses with the intent of inducing Rabi oscillations on the desired qubit. However, standard Rabi pulses are not robust against errors in frequency and timing, and they are also not optimal with respect to leakage into higher excited qubit states. The goal of this project is to use advanced methods in optimal control theory to accurately manipulate control pulses for generating both single and two-qubit gates. The candidate is expected to develop these optimal control techniques and to experimentally demonstrate improvement of the quantum gate fidelities of Chalmers quantum processors.
Position 2 – Reduced qubit decoherence by materials modeling, process development, and device characterization
Dielectric loss is the currently dominant decoherence mechanism in superconducting qubits (Burnett 2019). Other important contributions to decoherence originate from phonons and quasiparticles. Here we propose a joint experimental-theoretical study of decoherence at the level of the physics of the constituent materials by joining forces between Chalmers and Aalto. We foresee that this effort will drastically improve our understanding of the microscopic mechanisms of decoherence and its effect on our devices, which will directly help improve the design and process development of our devices already during the project.
To qualify for the position of postdoc, you must hold a PhD in Physics, Applied Physics, Nanotechnology, or equivalent. You have expertise in experimental quantum computing, microwave quantum optics, or related fields in experimental physics. You are motivated for a career in quantum technology, be it in academia or at an institute or company. You have a collaborative attitude and an interest in working both independently and collaboratively in a team environment, sharing best practices and assuming responsibility. You are self-motivated, pay attention to detail, and possess a problem-solving analytical ability. You are willing to help supervise PhD students. The position requires sound verbal and written communication skills in English.
This postdoc position is a full-time temporary employment for two years.
Chalmers offers a cultivating and inspiring working environment in the coastal city of Gothenburg.
Read more about working at Chalmers and our benefits for employees.
Chalmers aims to actively improve our gender balance. We work broadly with equality projects, for example the GENIE Initiative on gender equality for excellence. Equality and diversity are substantial foundations in all activities at Chalmers.
The application should be marked with Ref 20220172 and written in English. The application should be sent electronically and be attached as pdf-files, as below:
CV: (Please name the document as: CV, Surname, Ref. number) including:
• CV, include complete list of publications
• Previous teaching and pedagogical experiences
• Two references that we can contact.
Personal letter: (Please name the document as: Personal letter, Family name, Ref. number)
1-3 pages where you:
• Introduce yourself
• Describe your previous research fields and main research results
• Describe your future goals and future research focus
• Attested copies of completed education, grades and other certificates.
Please use the button at the foot of the page to reach the application form. The files may be compressed (zipped).
Application deadline: 1 May 2022.
For questions, please contact:
PI in Sweden: Giovanna Tancredi, Chalmers, email@example.com
PI in Finland: Sorin Paraoanu, Aalto, firstname.lastname@example.org
PI in Sweden: Jonas Bylander, Chalmers, email@example.com
PI in Finland: Mikko Möttönen, Aalto, firstname.lastname@example.org
Apply through https://www.chalmers.se/en/about-chalmers/Working-at-Chalmers/Vacancies/Pages/default.aspx
How to apply
Go to and fill the application there: https://www.chalmers.se/en/about-chalmers/Working-at-Chalmers/Vacancies/Pages/default.aspx?rmpage=job&rmjob=10417&rmlang=UK
Published on April 25, 2022