Regensburg 2019 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 10: Quantum information systems

HL 10.5: Talk

Monday, April 1, 2019, 16:15–16:30, H36

Cavity quantum electrodynamics with spin and valley — •Christoph Adelsberger, Monica Benito, and Guido Burkard — Department of Physics, University of Konstanz, D-78464 Konstanz, Germany

The energy level structure of a double quantum dot fabricated in Si/SiGe combines orbital, spin and valley degrees of freedom [1]. Although it has been demonstrated that in some cases the orbital and spin degrees of freedom can be isolated from the valley in order to engineer a strong interaction between the electronic spin and a photon in a coupled superconducting microwave resonator [2,3,4], it is desirable to understand the general role of the valley in this kind of cavity quantum electrodynamics setup. First, we analyze the possibility for a strong interaction between the valley degree of freedom and a microwave photon, which could benefit from protection against charge noise [5]. Then we incorporate the spin degree of freedom and investigate the possible hybrid qubits that provide a useful relation between coupling strength to the photons in the resonator and decoherence due to typical noise sources. We expect that these results contribute to the future performance of long-distance coupling between qubits in this potentially scalable semiconductor quantum dot systems.

[1] G. Burkard and J. R. Petta, PRB 94, 195305 (2016).

[2] X. Mi et al., Nature 555, 599 (2018).

[3] N. Samkharadze et al., Science 359, 1123 (2018).

[4] M. Benito et al., PRB 96, 235434 (2017).

[5] X. Mi, S. Kohler, and J. R. Petta, PRB 98, 161404(R) (2018).