Jae, Jeongwoo Lee, Jiwon Kim, M. S. Lee, Kwang-Geol Lee, Jinhyoung 2024-07-18T02:30:14Z 2024-07-18T02:30:14Z 2024-07-18 2024-07 2056-6387 https://pubs.kist.re.kr/handle/201004/150240 We demonstrate that the contextuality of measurement selection can enhance the precision of quantum metrology with a simple linear optical experiment. Contextuality is a nonclassical property known as a resource for various quantum information processing tasks. Recent studies show that contextuality by anomalous weak values can be utilized to enhance metrological precision, unraveling the role of contextuality in quantum metrology. Our contextual quantum metrology (coQM) scheme can elevate the precision of the optical polarimetry as much as 6 times the precision limit given by the Quantum Fisher Information. We achieve the contextuality-enabled enhancement with two mutually complementary measurements, whereas, in the conventional method, some optimal measurements to achieve the precision limit are either theoretically challenging to find or experimentally infeasible to realize. These results highlight that the contextuality of measurement selection is applicable in practice for quantum metrology. English The University of New South Wales (UNSW Australia) | Nature Publishing Group Contextual quantum metrology Article 10.1038/s41534-024-00862-5 1 npj Quantum Information, v.10, no.1 npj Quantum Information 10 1 Y scie scopus 001262287800001 2-s2.0-85197500872 Quantum Science & Technology Physics, Applied Physics, Atomic, Molecular & Chemical Physics, Condensed Matter Physics Article ENTANGLEMENT LIGO