Berlin 2024 – scientific programme

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QI: Fachverband Quanteninformation

QI 10: Focus Session: Exploring Quantum Entanglement with Superconducting Qubits and Resonators (joint session QI/TT)

QI 10.2: Invited Talk

Tuesday, March 19, 2024, 10:00–10:30, HFT-FT 131

Microwave quantum networks — •Kirill G. Fedorov — Walther-Meißner-Institut, 85748 Garching, Germany — School of Natural Sciences, Technische Universität München, 85748 Garching, Germany — Munich Center for Quantum Science and Technology (MCQST), 80799 München, Germany

Distributing quantum entanglement between distant nodes of a large-scale network is a fundamentally important milestone for many applications in the field of quantum information processing. Here, entanglement in the form of two-mode squeezed light can be employed as a resource for various nonclassical communication protocols, such as quantum teleportation or remote qubit entanglement. Motivated by the recent breakthroughs in quantum computation & simulation with superconducting circuits operated at microwave frequencies, we demonstrate distribution of two-mode squeezed states at carrier frequencies around 5.5 GHz across a local area cryogenic quantum network. We present the experimental evidence for robustness of the microwave entanglement distribution against noise and losses in superconducting channels. Furthermore, we utilize this entanglement resource to perform a coherent state teleportation between distant cryostats with fidelities exceeding the no-cloning limit. Finally, by relying on the same technology and frequency range, we discuss remote entanglement of superconducting qubits with two-mode squeezed microwave light. Our results highlight feasibility of microwave quantum communication and pave the road towards distributed quantum computing with superconducting circuits.

Keywords: superconducting qubits; microwave quantum networks; vacuum squeezing; entanglement distribution; quantum teleportation