SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster: Superconductivity II
TT 58.32: Poster
Thursday, March 30, 2023, 15:00–18:00, P2/OG3
Towards remote entanglement of superconducting qubits — •Simon Gandorfer1,2, Joan Agusti1,2, Peter Rabl1,2, Rudolf Gross1,2,3, and Kirill G. Fedorov1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2School of Natural Sciences, Technische Universität München, 85748 Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany
Distributing entanglement between the spatially separated nodes of a large-scale quantum network is a fundamentally important milestone for many applications. It also provides the quantum resource for various quantum protocols, such as quantum teleportation or remote qubit gate operations. We investigate microwave entanglement distribution between remote superconducting qubits by building appropriate theoretical and numerical models. To this end, we consider two distant superconducting transmon qubits dispersively coupled to local cavities. These remote systems can be illuminated by a two-mode squeezed state, which acts as a quantum-correlated reservoir for the qubits. Local qubit drives steer and maintain the system in the desired Bell state. This entanglement conversion between continuous- and discrete-variables allows for promising and robust local area quantum microwave networks. Furthermore, we identify crucial system parameters, such as qubit coherence times and two-mode squeezing strength, which are central for an experimental implementation.