Advances in photonic quantum sensing

Pirandola, Stefano; Bardhan, Bhaskar Roy; Gehring, Tobias; Weedbrook, Christian; Lloyd, Seth

doi:10.1038/s41566-018-0301-6

Cited by 562 publications

(456 citation statements)

References 140 publications

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“…The state of the light focused on the image plane is still described by a bipartite two-mode state as in Eqs. (13)- (14), but now I put…”

Section: Quantum Fisher Information With Noisy Imagingmentioning

confidence: 99%

Subwavelength quantum imaging with noisy detectors

Lupo¹

2020

Phys. Rev. A

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It has been recently shown that an interferometric measurement may allow for sub-wavelength resolution of incoherent light. Whereas this holds for noiseless detectors, one could expect that the resolution is in practice limited by signal-to-noise ratio. Here I present an assessment of the ultimate resolution limits that can be achieved using noisy detectors. My analysis indeed indicates that the signal-to-noise ratio represents a fundamental limit to quantum imaging, and the reduced resolution scales with the square root of the signal-to-noise ratio. For example, a signal-to-ratio of 20dB is needed to resolve one order of magnitude below the Rayleigh limit.

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“…The state of the light focused on the image plane is still described by a bipartite two-mode state as in Eqs. (13)- (14), but now I put…”

Section: Quantum Fisher Information With Noisy Imagingmentioning

confidence: 99%

Subwavelength quantum imaging with noisy detectors

Lupo¹

2020

Phys. Rev. A

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“…In consequence, the maximum photon number variance leads to the greatest quantum enhancement over the standard quantum limit (SQL), i.e., f D scaled with -/ N 1 2 [47]. Such scaling is the optimal scaling that can be obtained when only classical resources are used [48]. Therefore, it is of utmost importance to identify quantum states with a maximum photon number variance.…”

Section: Phase Estimationmentioning

confidence: 99%

Using states with a large photon number variance to increase quantum Fisher information in single-mode phase estimation

Lee

Jeong

et al. 2019

J. Phys. Commun.

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When estimating the phase of a single mode, the quantum Fisher information for a pure probe state is proportional to the photon number variance of the probe state. In this work, we point out particular states that offer photon number distributions exhibiting a large variance, which would help to improve the local estimation precision. These theoretical examples are expected to stimulate the community to put more attention to those states that we found, and to work towards their experimental realization and usage in quantum metrology.

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“…whose lower bound equal to 1 corresponds to the generalized CRB in Eq. (6). The estimation is now performed at a fixed value of ϕ 2.8 rad when the visibility of the interference fringes has decreased to v true 0.96.…”

Section: B Experimentsmentioning

confidence: 99%

Diagnosing Imperfections in Quantum Sensors via Generalized Cramér-Rao Bounds

et al. 2020

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Quantum metrology derives its capabilities from the careful employ of quantum resources for carrying out measurements. This advantage however relies on refined data post-processing, assessed based on the variance of the estimated parameter. When Bayesian techniques are adopted, more elements become available for assessing the quality of the estimation. Here we adopt generalized classical Cramér-Rao bounds for looking in detail into a phase estimation experiment performed with quantum light. In particular we show that the third order absolute moment can give a superior capability in revealing biases in the estimation, compared to standard approaches. Our studies point to identify a novel strategy that brings a possible advantage in monitoring the correct operation of high precision sensors.

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Advances in photonic quantum sensing

Cited by 562 publications

References 140 publications

Subwavelength quantum imaging with noisy detectors

Subwavelength quantum imaging with noisy detectors

Using states with a large photon number variance to increase quantum Fisher information in single-mode phase estimation

Diagnosing Imperfections in Quantum Sensors via Generalized Cramér-Rao Bounds

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