Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 71: Quantum Information Systems (joint session HL/TT)
TT 71.1: Vortrag
Mittwoch, 14. März 2018, 15:00–15:15, EW 203
Input-output theory for spin-photon coupling in Si double quantum dots — •Mónica Benito1, Xiao Mi2, Jacob M. Taylor3, Jason R. Petta2, and Guido Burkard1 — 1University of Konstanz — 2Princeton University — 3Joint Quantum Institute/NIST
The interaction of qubits via microwave frequency photons enables long-distance qubit-qubit coupling and facilitates the realization of a large-scale quantum processor. However, qubits based on electron spins in semiconductor quantum dots have proven challenging to couple to microwave photons. In this theoretical work [1] we show that a sizable coupling for a single electron spin is possible via spin-charge hybridization using a magnetic field gradient in a silicon double quantum dot. Based on parameters already shown in recent experiments, we predict optimal working points to achieve a coherent spin-photon coupling. Our predictions are in good agreement with recent measurements [2] which demonstrate strong coupling with spin-photon coupling rates of more than 10 MHz. These results open a direct path towards entangling single spins using microwave frequency photons. Furthermore, we employ input-output theory to identify observable signatures of spin-photon coupling in the cavity output field, which can provide guidance to the experimental search for strong coupling in such spin-photon systems and opens the way to cavity-based readout of the spin qubit.
[1] M. Benito, X. Mi, J. M. Taylor, J. R. Petta, and G. Burkard. arXiv:1710.02508.
[2] X. Mi, M. Benito, S. Putz, D. M. Zajac, J. M. Taylor, G. Burkard, and J. R. Petta. arXiv:1710.03265.