Optimal estimation of losses at the ultimate quantum limit with non-Gaussian states

By Gerardo Adesso, F. Dell'anno, S. Siena, Fabrizio Illuminati, L. A. M. Souza. 2008

147 citations recorded by the source corpus.

We address the estimation of the loss parameter of a bosonic channel probed by arbitrary signals. Unlike the optimal Gaussian probes, which can attain the ultimate bound on precision asymptotically either for very small or very large losses, we prove that Fock states at any fixed photon number saturate the bound unconditionally for any value of the loss. In the relevant regime of low-energy probes, we demonstrate that superpositions of the first low-lying Fock states yield an absolute improvement over any Gaussian probe. Such few-photon states can be recast quite generally as truncations of de-Gaussified photon-subtracted states.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/55a23cfa33a3564b91428293875912a61d1184a7

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Quantum-enhanced measurements without entanglement (2017, background): “The optimal scaling Iη ' [η(1−η)]−1n̄ can be achieved by using Fock states at the input (Adesso et al., 2009).”
Quantum-optical state engineering up to the two-photon level (2009, unknown): “In addition to these states being of fundamental interest, they can be used for practical applications, such as optimal estimation of the loss parameter of a Gaussian bosonic channe”