Classes of Gaussian states for squeezing estimation

Souza, Leonardo A.M.

doi:10.1016/j.physleta.2024.129431

Physics Letters A

2024

DOI: 10.1016/j.physleta.2024.129431

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Classes of Gaussian states for squeezing estimation

Leonardo A.M. Souza

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2024

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Collisional thermometry for Gaussian systems

Alves,

Santos,

Landi

2024

Phys. Rev. A

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We investigate a quantum thermometry scheme-based collision model with Gaussian systems. A key open question of these schemes concerns the scaling of the quantum Fisher information (QFI) with the number of ancillas. In qubit-based implementations this question is difficult to assess, due to the exponentially growing size of the Hilbert space. Here we focus on Gaussian collision models, which allow for the scaling of the QFI to be evaluated for arbitrarily large sizes. This numerical flexibility enables us to explore the thermometric properties of the model for a wide range of configurations. Despite the infinite Markov order of the stochastic process of the model, we provide a simple phenomenological analysis for the behavior of the QFI, estimating the asymptotic Fisher information density and how the transient effects of correlations for an increasing number of ancillas depend on the physical parameters of the model. Published by the American Physical Society 2024

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Collisional thermometry for Gaussian systems

Alves,

Santos,

Landi

2024

Phys. Rev. A

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Classes of Gaussian states for squeezing estimation

Cited by 1 publication

References 51 publications

Collisional thermometry for Gaussian systems

Collisional thermometry for Gaussian systems

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