Rehman, Junaid ur Hong, Seongjin Lee, Seung-Woo Kim, Yong-Su Cho, Young Wook Jung, Hojoong Moon, Sung Shin, Hyundong Han, Sang-Wook Lim, Hyang-Tag 2024-01-19T11:03:33Z 2024-01-19T11:03:33Z 2022-10-20 2022-09 2469-9926 https://pubs.kist.re.kr/handle/201004/114557 Quantum multiple parameter estimation can achieve an enhanced sensitivity beyond the classical limit. Although a theoretical ultimate sensitivity bound for multiple phase estimation is given by the quantum Cramer -Rao bound (QCRB), experimental implementations to saturate the QCRB typically require an impractical setup including entangled measurements. Since it is experimentally challenging to implement an entangled measurement, the practical sensitivity is given by the Cramer-Rao bound (CRB) relevant to the measurement probabilities. Here, we consider the problem of practical sensitivity bound for multiple phase estimation with quantum probe states and a measurement setup without entanglement, which consists of a beam splitter followed by the photon-number-resolving measurement. In this practical measurement scheme, we show that lower CRB can be achieved with a quantum probe state even with higher QCRB. English American Physical Society Optimal strategy for multiple-phase estimation under practical measurement with multimode NOON states Article 10.1103/PhysRevA.106.032612 1 Physical Review A, v.106, no.3 Physical Review A 106 3 N scie scopus 000863088400005 Optics Physics, Atomic, Molecular & Chemical Optics Physics Article