2 Postdoc Positions in Quantum Acoustic with Superconducting Circuits



We are looking for highly motivated post-doctoral researchers to join our experimental research on quantum acoustics with superconducting circuits. The expected start date for these positions are during the fall of 2020. The deadline for applications is October 1st, 2020, but we will start reviewing applications on September 1st.

Information about the division
At the Quantum Technology division of the Microtechnology and Nanoscience (MC2) department, we pursue state-of-the art research in quantum information science, microwave quantum optics, and mechanical quantum devices. We are also part of the Wallenberg Centre for Quantum Technology (WACQT), a 12-year initiative, started in 2018, for the purpose of advancing Swedish academia and industry to the forefront of quantum technology, and to build a Swedish quantum computer.

Information about the project
Superconducting circuits based on Josephson junctions have emerged as an excellent platform for studying quantum physics in the microwave domain. Such circuits are also the basis of the leading architecture for quantum computing. The combination of the low dissipation and the strong nonlinearities present in the Josephson junctions provides a major advantage. In the last 5-6 years it has also become clear that it is possible to make these circuits interact with phonons via piezoelectric substrates, in particular we study interaction with Surface Acoustic Waves (SAWs) using GaAs and LiNbO3 as substrates.

The first project aims at studying multimode SAW-resonators with a small free spectral range that are formed between two Bragg-mirrors on a GaAs substrate. One of these mirrors is made tunable by incorporating a SQUID (Superconducting Quantum Interference Device) in one of the mirrors. This allows fast tuning of the effective mirror position and parametric driving of the resonator. Applying different tones to the SQUID results in quantum squeezing of phonons. The goal of this project is to investigate the possibility of creating cluster states in this novel and compact platform.

In the second project we study artificial atoms in the form of superconducting qubits that are strongly coupled to the phononic vacuum in the LiNbO3 substrate. This coupling gives rise to a Lamb shift which is interesting for several reasons. Firstly it is a phononic vacuum rather that a photonic vacuum, secondly the coupling is very strong, and thirdly the coupling is frequency dependent which therefore also gives rise to a frequency dependent Lamb shift. The goal of this project is to understand how these unusual properties modify the Lamb shift.

Major responsibilities
You will perform experimental research, both individually and as part of our team. You will also interact with the neighboring theory group. The work includes:

– Design and fabrication of SAW quantum devices
– Microwave measurements with nearly quantum-limited noise performance
– Analysis of the data and comparison to theory

You will take advantage of the infrastructure and expertise available in our team and division. Your research will benefit from regular interactions with our collaborators in Sweden and abroad. As a post-doc/researcher, we expect you to contribute to the informal supervision of younger graduate students.

Position summary
Full-time temporary employment. The position is limited to a maximum of two years (1+1).

You hold a PhD degree in Physics, Engineering Physics, or Applied Physics, or you plan to defend your PhD thesis before Dec 31st, 2020. You have a strong interest or experience in at least two of the following areas: quantum optics, quantum acoustics, microwave engineering, cryogenics, nanofabrication, or superconductivity.

You are driven by scientific curiosity and by a desire to make a difference. You can confidently read, write, and discuss science in English. We will consider outstanding candidates with proven track record in any field of physics.

Chalmers continuously strives to be an attractive employer. Equality and diversity are substantial foundations in all activities at Chalmers.

Our offer to you
Chalmers offers a cultivating and inspiring working environment in the dynamic city of Gothenburg
Read more about working at Chalmers and our benefits for employees.

Application procedure
The application should be marked with Ref 20200357 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:
• Education
• Previous employments or leadership qualifications and positions of trust, if relevant
• Publication list
• Name and contact details of at least two references

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

Other documents:
• Copies of MSc and PhD theses
• 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: October 1st – 2020

For questions, please contact:
Prof. Per Delsing, Quantum Technology, MC2

Chalmers University of Technology conducts research and education in engineering sciences, architecture, technology-related mathematical sciences, natural and nautical sciences, working in close collaboration with industry and society. The strategy for scientific excellence focuses on our six Areas of Advance; Energy, Health Engineering, Information and Communication Technology, Materials Science, Production and Transport. The aim is to make an active contribution to a sustainable future using the basic sciences as a foundation and innovation and entrepreneurship as the central driving forces. Chalmers has around 11,000 students and 3,000 employees. New knowledge and improved technology have characterised Chalmers since its foundation in 1829, completely in accordance with the will of William Chalmers and his motto: Avancez!    

Read the job description at the university homepage


Post expires on Thursday October 1st, 2020