Projects per year
Abstract
Standard procedures for entanglement detection assume that experimenters can exactly implement specific quantum measurements. Here, we depart from such idealizations and investigate, in both theory and experiment, the detection of genuine multipartite entanglement when measurements are subject to small imperfections. For arbitrary qubits number n, we construct multipartite entanglement witnesses where the detrimental influence of the imperfection is independent of n. In a tabletop four-partite photonic experiment, we demonstrate first how a small amount of alignment error can undermine the conclusions drawn from standard entanglement witnesses and then perform the correction analysis. Furthermore, since we consider quantum devices that are trusted but not perfectly controlled, we showcase advantages in terms of noise resilience as compared to device-independent models.
Original language | English |
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Article number | 150201 |
Number of pages | 7 |
Journal | Physical Review Letters |
Volume | 133 |
Issue number | 15 |
DOIs | |
Publication status | Published - 11 Oct 2024 |
Austrian Fields of Science 2012
- 103025 Quantum mechanics
- 103026 Quantum optics
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Photonic Quantum Memristor Networks
Walther, P., Osellame, R. & Stobinska, M.
1/06/22 → 31/05/25
Project: Research funding
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Multiphotonen-Experimente mit Halbleiterquantenpunkten
Walther, P., Rastelli, A., Kraus, B. & Weihs, G.
1/09/20 → 31/08/25
Project: Research funding
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Christian Doppler Laboratory for Photonic Quantum Computer
1/07/20 → 30/06/25
Project: Research cooperation