Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 27: Special Session: Quantum Networks

FM 27.1: Invited Talk

Dienstag, 24. September 2019, 11:00–11:30, Audi Max

Frontiers in quantum acoustics — •Andrew Cleland — Pritzker School of Molecular Engineering, University of Chicago Chicago IL 60637 USA

Superconducting qubits provide unique opportunities as a testbed for quantum communication as well as developing hybrid quantum systems. Here, I will discuss applications for superconducting qubits in generating and detecting individual phonons, in the form of surface acoustic wave (SAW) excitations, and using these phonon states to generate remote quantum entanglement. Specifically, I will describe recent experiments [1,2] where we have demonstrated the use of reasonably high finesse acoustic Fabry-Perot structures to store acoustic phonon Fock states, in which we can measure the Wigner tomograms of individual Fock states as well as their superpositions. In more recent work, we have coupled two superconducting qubits to a long SAW resonator with a 500 ns phonon bounce time. We can release and recapture individual itinerant phonons using one of the two qubits, as well as transfer quantum states between the two qubits.

In this talk, I will introduce the superconducting qubits we use for these experiments, explain details of how the acoustic systems are integrated with the qubits, and describe how we use the qubits to achieve quantum control over acoustic phonons.

[1] K. J. Satzinger et al., ``Quantum control of surface acoustic wave phonons'', Nature 563, 661-665 (2018). [2] A. Bienfait et al., ``Phonon-mediated quantum state transfer and remote qubit entanglement'', Science 364, 368-371 (2019).

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