We investigate photon-mediated transport processes in a hybrid circuit-QED structure consisting of two double quantum dots coupled to a common microwave cavity. Under suitable resonance conditions, electron transport in one double quantum dot is facilitated by the transport in the other dot via photon-mediated processes through the cavity. We calculate the average current in the quantum dots, the mean cavity photon occupation, and the current cross-correlations with both a full numerical simulation and a recursive perturbation scheme that allows us to include the influence of the cavity order-by-order in the couplings between the cavity and the quantum dot systems. We can then clearly identify the photon-mediated transport processes.We investigate photon-mediated transport processes in a hybrid circuit-QED structure consisting of two double quantum dots coupled to a common microwave cavity. Under suitable resonance conditions, electron transport in one double quantum dot is facilitated by the transport in the other dot via photon-mediated processes through the cavity. We calculate the average current in the quantum dots, the mean cavity photon occupation, and the current cross-correlations with both a full numerical simulation and a recursive perturbation scheme that allows us to include the influence of the cavity order-by-order in the couplings between the cavity and the quantum dot systems. We can then clearly identify the photon-mediated transport processes.

Jan 1, 201339 citations

Photon-mediated electron transport in hybrid circuit-QED

Neill Lambert, Christian Flindt, Franco Nori

arXiv:1303.7449Europhysics Letters (EPL)Jul 1, 201345 citations

Hybrid Circuit QED with Spin Qubits

Andreas Landig

Jan 1, 20190 citations

Hybrid Quantum Circuits

Landry Bretheau

Jun 10, 20220 citations

Coupling of a hole double quantum dot in planar germanium to a microwave cavity

Yuan Kang, Zong-Hu Li, Zhenzhen Kong +10 more

In recent years, notable progress has been made in the study of hole qubits in planar germanium, and circuit quantum electrodynamics (circuit QED) has emerged as a promising approach for achieving long-range coupling and scaling up of qubits. Here, we demonstrate the coupling between holes in a planar germanium double quantum dot (DQD) and photons in a microwave cavity. Specifically, a real-time calibrated virtual gate method is developed to characterize this hybrid system, which in turn allows us to determine the typical parameters sequentially through a single-parameter fitting instead of conventional multiparameter fitting with additional uncertainty, giving a hole-photon coupling rate of ${g}_{0}$ /2\ensuremath{\pi} = 21.7 MHz. This work is a step toward further research on hole-photon interactions and long-range qubit coupling in planar germanium. The experimental method developed in this work contributes to a more accurate and efficient characterization of hybrid cavity-QED systems.In recent years, notable progress has been made in the study of hole qubits in planar germanium, and circuit quantum electrodynamics (circuit QED) has emerged as a promising approach for achieving long-range coupling and scaling up of qubits. Here, we demonstrate the coupling between holes in a planar germanium double quantum dot (DQD) and photons in a microwave cavity. Specifically, a real-time calibrated virtual gate method is developed to characterize this hybrid system, which in turn allows us to determine the typical parameters sequentially through a single-parameter fitting instead of conventional multiparameter fitting with additional uncertainty, giving a hole-photon coupling rate of ${g}_{0}$/2\ensuremath{\pi} = 21.7 MHz. This work is a step toward further research on hole-photon interactions and long-range qubit coupling in planar germanium. The experimental method developed in this work contributes to a more accurate and efficient characterization of hybrid cavity-QED systems.

arXiv:2310.08145Physical Review AppliedAug 20, 202415 citations

{g}_{0}

/2\ensuremath{\pi} = 21.7 MHz. This work is a step toward further research on hole-photon interactions and long-range qubit coupling in planar germanium. The experimental method developed in this work contributes to a more accurate and efficient characterization of hybrid cavity-QED systems.