Propagating acoustic fields at the single-phonon level(WP2-4)

For applicants: This position is no longer available

Host: Chalmers Tekniska Hoegskola (CHALMERS )
Supervisor: P. Delsing, Co-supervisor: P.V. Santos (PDI).

Gothenburg

Gustav Andersson

Gustav recently completed his Master’s degree in condensed matter physics at Technische Universität München, with a thesis on transmon qubits coupled to superconducting 3D cavities. In August he joined the SAWtrain network as an ESR in the Quantum Device Physics laboratory at Chalmers University of Technology in Gothenburg, Sweden, to investigate acoustic analogues to quantum optics. His research interests include quantum light-matter interaction and emerging applications in quantum information processing. At Chalmers, Gustav will explore new regimes in quantum optics by coupling superconducting qubits to surface acoustic wave fields, in particular excited state decay via short wavelength phonons.

Objectives

The Chalmers group has recently shown that surface acoustic waves can be coupled to superconducting qubits at the quantum level. This open up new and exciting possibilities to do single phonon physics. By first electrically exciting the qubit and then letting it decay by emitting a single phonon, it is possible to implement a high-fidelity single phonon source.

Expected Results

The PhD student will design and fabricate samples with IDT transducers and transmons. He/she will collaborate with other PhD student within the SAWtrain network. The student will optimize the IDTs for optimum energy conversion between the electrical to the mechanical domains. The PhD student will visit PDI and TWENTE to fabricate high-frequency IDTs. He/she will perform reflection/transmission measurements to verify the nonlinear coupling between the SAW and the qubit and extract the coupling strength. The PhD student will build a single-phonon source and verify its operation by measuring the second-order correlation function of the outgoing mechanical signal, as converted to the electrical domain by the IDT.

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