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QI: Fachverband Quanteninformation
QI 14: Quantum Information Poster Session
QI 14.7: Poster
Mittwoch, 11. März 2026, 18:00–21:00, P4
Entanglement distillation of microwave entangled states — •Ivan Solomakhin1,2, Simon Gandorfer1,2, Maria-Teresa Handschuh1,2, Jasmine Frijters1,2, Wun Kwan Yam1,2, Achim Marx1,2, and Kirill G. Fedorov1,2,3 — 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
Quantum entanglement is a crucial resource in continuous-variable quantum protocols, such as quantum teleportation and quantum key distribution. However, as the communication distance and complexity increase, losses due to unavoidable imperfections along the signal path lead to the degradation of shared entanglement and diminish the protocol performance. This challenge motivates the development and optimization of entanglement distillation strategies. Here, we investigate experimental implementations of entanglement distillation based on photon-subtraction techniques in application to two-mode squeezed, path-entangled microwave states. We employ superconducting Josephson amplifiers for the generation of two-mode squeezed states. Photon subtraction is realized by using a single-photon microwave detector composed of a transmon qubit in a multimode cavity. We analyze the resulting improvement in entanglement and discuss its implications for quantum communication and quantum networks in the microwave regime.
Keywords: Entanglement distillation; Non-Gaussian quantum states; Superconducting qubits; Microwaves; Superconductors