Entanglement

Entanglement is one of the most intriguing features of quantum theory and plays a central role in quantum information science. Determining whether a given state is entangled remains a significant challenge. While Bell inequalities are commonly used for experimental detection, they fail to reveal all entangled states—even in simple two-qubit systems. In such cases, the Peres–Horodecki criterion provides a necessary and sufficient condition, but for higher-dimensional and multipartite systems, no general simple criterion is known. Our work has focused on the generation and verification of multipartite entanglement, from three- and four-photon states to more complex systems. We have contributed to the development of entanglement witnesses as practical tools for detecting and certifying genuine multipartite entanglement with available technology. In addition, we have studied the characterization of bound entanglement, including its experimental creation and the demonstration of super additivity of entanglement resources. Taken together, these contributions aim to advance both the fundamental understanding and the reliable experimental detection of entanglement in realistic settings.

• Experimental test of maximal tripartite nonlocality using an entangled state and local measurements that are maximally incompatible, H. Anwer, M. Nawareg, A. Cabello, M. Bourennane, Physical Review A 100 (2), 022104 (2019)
• Superadditivity of two quantum information resources, M. Nawareg, S. Muhammad, P. Horodecki, M. Bourennane, Science Advances 3 (9), e1602485 (2017)
• Experimental bound entanglement through a Pauli channel, E. Amselem, M. Sadiq, M. Bourennane, Scientific Reports 3 (1), 1966 (2013)
• Reply to Experimental bound entanglement, E. Amselem, M. Bourennane, Nature Physics 6 (11), 827-827 (2010)
• Experimental high fidelity six-photon entangled state for telecloning protocols, M. Rådmark, M. Żukowski, M. Bourennane, New Journal of Physics 11 (10), 103016 (2009)
• Experimental four-qubit bound entanglement, E. Amselem, M. Bourennane, Nature Physics 5 (10), 748-752 (2009)
• Generation of a high visibility rotationally invariant six-photon entangled state, M. Radmark, M. Zukowski, M. Bourennane, CLEO/Europe-EQEC 2009-European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference (2009)
• Experimental Test of Fidelity Limits in Six-Photon Interferometry and of Rotational Invariance Properties of the Photonic Six-Qubit Entanglement Singlet State, M. Radmark, M. Zukowski, M. Bourennane, Physical Review Letters 103 (15), 150501 (2009)
• Entanglement persistency of multiphoton entangled states, M. Bourennane, M. Eibl, S. Gaertner, N. Kiesel, C. Kurtsiefer, H. Weinfurter, Physical Review Letters 96 (10), 100502 (2006)
• An upper bound on the maximal probability for successful conversion of multipartite pure entangled states, I. Ghiu, M. Bourennane, A. Karlsson, Romanian Reports in Physics 57 (3), 285 (2005)
• Four photon polarization entanglement tests and applications, M. Bourennane, M. Eibl, S. Gaertner, C. Kurtsiefer, H. Weinfurter, A. Cabello, O. Gühne, Ph. Hyllus, D. Bruß, M. Lewenstein, A. Sanpera, International Journal of Quantum Information 2 (01), 133-147 (2004)
• Experimental detection of multipartite entanglement using witness operators, M. Bourennane, M. Eibl, C. Kurtsiefer, S. Gaertner, H. Weinfurter, O. Gühne, Ph. Hyllus, D. Bruß, M. Lewenstein, Physical Review Letters 92 (8), 087902 (2004)
• Experimental Realization of a Three-Qubit Entangled State, M. Eibl, N. Kiesel, M. Bourennane, C. Kurtsiefer, H. Weinfurter, Physical Review Letters 92 (7), 077901 (2004)
• Compact source of polarization-entangled photon pairs, P. Trojek, C. Schmid, M. Bourennane, H. Weinfurter, C. Kurtsiefer, Optics Express 12 (2), 276-281 (2004)
• High-fidelity source of four-photon entanglement, S. Gaertner, M. Bourennane, M. Eibl, C. Kurtsiefer, H. Weinfurter, Applied Physics B 77 (8), 803-807 (2003)
• Experimental demonstration of entanglement robustness in four-qubits entangled system, M. Bourennane, M. Eibl, S Gaertner, C. Kurtsiefer, H. Weinfurter, 2003 European Quantum Electronics Conference. EQEC 2003 (IEEE Cat No.03TH8665)
• Three photon W state, M. Eibl, N. Kiesel, M. Bourennane, S. Gaertner, C. Kurtsiefer, H. Weinfurter, 2003 European Quantum Electronics Conference. EQEC 2003 (IEEE Cat No.03TH8665)
• Multiphoton entanglement and interferometry, M. Bourennane, M. Eibl, S. Gaertner, N. Kiesel, C. Kurtsiefer, M. Żukowski, H. Weinfurter, Fortschritte der Physik: Progress of Physics 51 (4‐5), 273-279 (2003)
• Three-photon W-state, N. Kiesel, M. Bourennane, C. Kurtsiefer, H. Weinfurter, D. Kaszlikowski, W. Laskowski, M. Zukowski, Journal of Modern Optics 50, p. 1131-1138 (2003)
• Multiphoton entanglement, M. Bourennane, M. Eibl, S. Gaertner, N. Kiesel, C. Kurtsiefer, M. Zukowski, Quantum Optics in Computing and Communications 4917, 45-53 (2002)
• Entanglement-assisted local transformations between inequivalent classes of three-particle entangled states, I. Ghiu, M. Bourennane, A. Karlsson, Physics Letters A 287 (1-2), 12-18 (2001)