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

Seongjin Hong, Junaid ur Rehman, Yong-Su Kim, Young-Wook Cho, Seung-Woo Lee, Hojoong Jung, Sung Moon, Sang-Wook Han and Hyang-Tag Lim ()
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Seongjin Hong: Korea Institute of Science and Technology (KIST)
Junaid ur Rehman: Korea Institute of Science and Technology (KIST)
Yong-Su Kim: Korea Institute of Science and Technology (KIST)
Young-Wook Cho: Korea Institute of Science and Technology (KIST)
Seung-Woo Lee: Korea Institute of Science and Technology (KIST)
Hojoong Jung: Korea Institute of Science and Technology (KIST)
Sung Moon: Korea Institute of Science and Technology (KIST)
Sang-Wook Han: Korea Institute of Science and Technology (KIST)
Hyang-Tag Lim: Korea Institute of Science and Technology (KIST)

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract 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.

Date: 2021
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DOI: 10.1038/s41467-021-25451-4

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