Transmission estimation at the quantum Cramér-Rao bound with macroscopic quantum light

EPJ Quantum Technology

Research

Carla Hermann-Avigliano¹  Timothy S. Woodworth²  Alberto M. Marino³  Kam Wai Clifford Chan⁴ 

[1] Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile;ANID – Millennium Science Initiative Program – Millennium Institute for Research in Optics (MIRO), Santiago, Chile;Homer L. Dodge Department of Physics and Astronomy, The University of Oklahoma, 73019, Norman, Oklahoma, USA;Center for Quantum Research and Technology, The University of Oklahoma, 73019, Norman, Oklahoma, USA;Homer L. Dodge Department of Physics and Astronomy, The University of Oklahoma, 73019, Norman, Oklahoma, USA;Center for Quantum Research and Technology, The University of Oklahoma, 73019, Norman, Oklahoma, USA;Quantum Information Science Section, Oak Ridge National Laboratory, 37381, Oak Ridge, Tennessee, USA;Quantum Science Center, Oak Ridge National Laboratory, 37381, Oak Ridge, Tennessee, USA;OAM Photonics LLC, 92126, San Diego, California, USA;

关键词: Quantum metrology;    Quantum sensing;    Quantum Cramér-Rao bound;    Quantum Fisher information;    Quantum optics;    Transmission estimation;   

DOI  :  10.1140/epjqt/s40507-022-00154-x

 received in 2022-09-10, accepted in 2022-11-18,  发布年份 2022

来源: Springer

【 摘 要 】

The field of quantum metrology seeks to apply quantum techniques and/or resources to classical sensing approaches with the goal of enhancing the precision in the estimation of a parameter beyond what can be achieved with classical resources. Theoretically, the fundamental minimum uncertainty in the estimation of a parameter for a given probing state is bounded by the quantum Cramér-Rao bound. From a practical perspective, it is necessary to find physical measurements that can saturate this fundamental limit and to show experimentally that it is possible to perform measurements with the required precision to do so. Here we perform experiments that saturate the quantum Cramér-Rao bound for transmission estimation over a wide range of transmissions when probing the system under study with a continuous wave bright two-mode squeezed state. To properly take into account the imperfections in the generation of the quantum state, we extend our previous theoretical results to incorporate the measured properties of the generated quantum state. For our largest transmission level of 84%, we show a 62% reduction over the optimal classical protocol in the variance in transmission estimation when probing with a bright two-mode squeezed state with −8 dB of intensity-difference squeezing. Given that transmission estimation is an integral part of many sensing protocols, such as plasmonic sensing, spectroscopy, calibration of the quantum efficiency of detectors, etc., the results presented promise to have a significant impact on a number of applications in various fields of research.

【 授权许可】

CC BY   
© UT-Battelle, LLC2022

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