2006/01/16 by Giulio Chiribella, G. Chiribella, Giacomo Mauro D’Ariano +3 · 2 citations
Computer Science · Physics and Astronomy · #Atomic and Subatomic Physics Research #Quantum Information and Cryptography #Quantum optics and atomic interactions #quant-ph
paper · pdf · doi:10.1103/physreva.73.062103
published as Phys. Rev. A 73, 062103 (2006) · 4 pages, 2 eps figures
arxiv created 2006/01/16 · openalex publication_date 2006/06/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present the optimal estimation of an unknown squeezing transformation of the radiation field. The optimal estimation is unbiased and is obtained by properly considering the degeneracy of the squeezing operator. For coherent input states, the root-mean square of the estimation scales as (2√n)^\ensuremath-1 versus the average photon number n, while it can be improved to (2n)^\ensuremath-1 by using displaced squeezed states.