TY - JOUR
T1 - Genuine Multipartite Entanglement Detection with Imperfect Measurements: Concept and Experiment
AU - Cao, Huan
AU - Morelli, Simon
AU - Rozema, Lee A.
AU - Zhang, Chao
AU - Tavakoli, Armin
AU - Walther, Philip
N1 - S.M. is supported by the Basque Gov-
ernment through IKUR strategy and through the BERC 2022-
2025 program and by the Ministry of Science and Innova-
tion: BCAM Severo Ochoa accreditation CEX2021-001142-
S / MICIN / AEI / 10.13039/501100011033. A.T. is sup-
ported by the Wenner-Gren Foundation and by the Knut and
Alice Wallenberg Foundation through the Wallenberg Center
for Quantum Technology (WACQT). P.W., L.R and H.C are
supported by the European Union’s Horizon 2020 research
and innovation programme under grant agreement No 820474
(UNIQORN) and No 899368) (EPIQUS); the Austrian Sci-
ence Fund (FWF) through [F7113] (BeyondC), and [FG5]
(Research Group 5); the AFOSR via FA9550-21- 1-0355
(QTRUST); the QuantERA II Programme under Grant Agree-
ment No 101017733 (PhoMemtor); the Austrian Federal Min-
istry for Digital and Economic Affairs, the National Foun-
dation for Research, Technology and Development and the
Christian Doppler Research Association. C.Z. is supported
by the Fundamental Research Funds for the Central Univer-
sities (Nos. WK2030000061, YD2030002015), the National
Natural Science Foundation of China (No. 62075208).
PY - 2024/10/11
Y1 - 2024/10/11
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85206284386&partnerID=8YFLogxK
U2 - 10.48550/arXiv.2310.11946
DO - 10.48550/arXiv.2310.11946
M3 - Article
AN - SCOPUS:85206284386
SN - 0031-9007
VL - 133
JO - Physical Review Letters
JF - Physical Review Letters
IS - 15
M1 - 150201
ER -