Multiphoton quantum metrology without pre-and post-selected measurements

Quantum metrology can achieve enhanced sensitivity for estimating unknown parameters beyond the standard quantum limit. Recently, multiple-phase estimation exploiting quantum resources has attracted intensive interest for its applications in quantum imaging and sensor networks. For multiple-phase estimation, the amount of enhanced sensitivity is dependent on quantum probe states, and multi-mode N00N states are known to be a key resource for this. However, its experimental demonstration has been missing so far since generating such states is highly challenging. Here, we report generation of multi-mode N00N states and experimental demonstration of quantum enhanced multiple-phase estimation using the multi-mode N00N states. In particular, we show that the quantum Cramer-Rao bound can be saturated using our two-photon four-mode N00N state and measurement scheme using a 4 × 4 multi-mode beam splitter. Our multiple-phase estimation strategy provides a faithful platform to investigate multiple parameter estimation scenarios.

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Quantum enhanced multiple-phase estimation with multi-mode N00N states

Hong

Rehman

Kim

et al. 2021

Nat Commun

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Applications of single photons in quantum metrology, biology and the foundations of quantum physics

et al. 2023

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Multiphoton quantum metrology without pre-and post-selected measurements

Cited by 2 publications

References 52 publications

Quantum enhanced multiple-phase estimation with multi-mode N00N states

Quantum enhanced multiple-phase estimation with multi-mode N00N states

Applications of single photons in quantum metrology, biology and the foundations of quantum physics

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