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Center for Nonlinear Studies |
Subtle properties of quantum physics, like coherent superpositions, squeezing, and entanglement may lead to sub-stantial increase in the precision of estimation of important physical parameters, contributing to frontier research inseveral fields, from the interaction of biological cells with light [1] to the probing of general relativity at the millimeterscale [2]. Devices based on quantum physics have allowed the precise estimation of the gravitational field [3], thedetailed imaging of the brain [4], the detection of gravitational-wave sources more than 400 million light years away[5], and an ever-increasing precision in the measurement of time [6]. Quantum metrology is the conceptual frame-work that encompasses all these devices, and quantum sensors allow the estimation of parameters with precisionhigher than that obtained with classical strategies. This talk reviews the basic concepts and some of the develop-ments in quantum sensing, focusing on recent developments in this field that lead to precision bounds for noisysystems [7—12].
[1] M. T. Cone, J. D. Mason, E. Figueroa, B. H. Hokr, J. N. Bixler, C. C. Castellanos, G. D. Noojin, J. C. Wigle, B. A. Rockwell,V. V. Yakovlev, and E. S. Fry, Measuring the absorption coefficient of biological materials using integrating cavity ring-down spectroscopy, Optica 2, 162 (2015).
[2] T. Bothwell, C.J. Kennedy, A. Aeppli et al., Resolving the gravitational redshift across a millimetre-scale atomic sam-ple, Nature 602, 420–424 (2022).
[3] V. Ménoret et al., Gravity measurements below 10−9 g with a transportable absolute quantum gravimeter, Sci. Rep.8, 12300 (2018).
[4] N. Aslam, H. Zhou, E. K. Urbach et al., Quantum sensors for biomedical applications, Nat Rev Phys 5, 157-169 (2023).[5] R. Abbott et al., Observation of gravitational waves from two neutron star–black hole coalescences, ApJL 915, L5(2021).
[6] Boulder Atomic Clock Optical Network (BACON) Collaboration, Frequency ratio measurements at 18-digit accuracyusing an optical clock network, Nature (London) 591, 564 (2021).
[7] B. M. Escher, R. L. de Matos Filho, and L. Davidovich, General framework for estimating the ultimate precision limitin noisy quantum-enhanced metrology, Nat. Phys. 7, 406 (2011).
[8] B. M. Escher, L. Davidovich, N. Zagury, and R. L. de Matos Filho, Quantum metrological limits via a variationalapproach, Phys. Rev. Lett. 109, 190404 (2012).
[9] M. M. Taddei, B. M. Escher, L. Davidovich, and R. L. de Matos Filho, Quantum Speed Limit for Physical Processes,Phys. Rev. Lett. 110, 050402 (2013).
[10] C. L. Latune, B. M. Escher, R. L. de Matos Filho, and L. Davidovich, Quantum limit for the measurement of a classicalforce coupled to a noisy quantum-mechanical oscillator, Phys. Rev. A 88, 042112 (2013).
[11] J. Wang, L. Davidovich, and G. S. Agarwal, Quantum sensing of open systems: Estimation of damping constantsand temperature, Phys. Rev. Res. 2, 033389 (2020).
[12] Jiaxuan Wang, Ruynet L. de Matos Filho, Girish S. Agarwal, and Luiz Davidovich, Quantum advantage of time-reversed ancilla-based metrology of absorption parameters, Phys. Rev. Research 6, 013034 (2024).
Bio: The main thrust of Luiz Davidovich work has been on the dynamics of open systems, involving theoreticaland experimental developments, with applications to cavity QED, entangled photon pairs, and quantum metrology.He has worked on the theory of cavity QED experiments carried out in Serge Haroche's group at Ecole NormaleSupérieure in Paris, and on the resilience of entangled photon states, with experiments carried out at the FederalUniversity of Rio de Janeiro. Lately, he has worked on the quantum metrology of open systems, cooperating withhis group at the Federal University of Rio de Janeiro and with Girish Agarwal at Texas A&M University. He is mem-ber of the Brazilian Academy of Sciences, and Foreign Member of the National Academy of Sciences, the ChineseAcademy of Sciences, and the European Academy of Sciences. He is Fellow of the American Physical Society andof the Optica Society.