Related papers: The power of microscopic nonclassical states to amplify the precision of macroscopic optical metrology

The power of microscopic nonclassical states to amplify the precision of macroscopic optical metrology

URL: http://arxiv.org/abs/2103.17206v2
Date: Fri, 3 Jun 2022 13:20:14 GMT
Title: The power of microscopic nonclassical states to amplify the precision of macroscopic optical metrology
Authors: Wenchao Ge, Kurt Jacobs, and M. Suhail Zubairy
Abstract summary: In non-classical states, the amount by which a non-classical state can enhance precision in this way has been termed its "metrological power" Here we are able to optimize over all measurement configurations to obtain the maximum enhancement that can be achieved by any single or multi-mode nonclassical state. It also reveals that the Mach-Zehnder interferometer is an optimal network for phase sensing for an arbitrary single-mode nonclassical input state.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: It is well-known that the precision of a phase measurement with a Mach-Zehnder interferometer employing strong (macroscopic) classic light can be greatly enhanced with the addition of a weak (microscopic) light field in a non-classical state. The resulting precision is much greater than that possible with either the macroscopic classical or microscopic quantum states alone. In the context of quantifying non-classicality, the amount by which a non-classical state can enhance precision in this way has been termed its "metrological power". Given the technological difficulty of producing high-amplitude non-classical states of light, this use of non-classical light is likely to provide a technological advantage much sooner than the Heisenberg scaling employing much stronger non-classical states. To date, the enhancement provided by weak nonclassical states has been calculated only for specific measurement configurations. Here we are able to optimize over all measurement configurations to obtain the maximum enhancement that can be achieved by any single or multi-mode nonclassical state together with strong classical states, for local and distributed quantum metrology employing any linear or nonlinear single-mode unitary transformation. Our analysis reveals that the quantum Fisher information for \textit{quadrature displacement sensing} is the sole property that determines the maximum achievable enhancement in all of these different scenarios, providing a unified quantification of the metrological power. It also reveals that the Mach-Zehnder interferometer is an optimal network for phase sensing for an arbitrary single-mode nonclassical input state, and how the Mach-Zehnder interferometer can be extended to make optimal use of any multi-mode nonclassical state for metrology.

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