Optimal probe states for the estimation of Gaussian unitary channels

Autor(en)

Dominik Safranek, Ivette Fuentes

Abstrakt

We construct a practical method for finding optimal Gaussian probe states for the estimation of parameters encoded by Gaussian unitary channels. This method can be used for finding all optimal probe states, rather than focusing on the performance of specific states as shown in previous studies. As an example, we apply this method to find optimal probes for the channel that combines the phase-change and squeezing channels, and for generalized two-mode squeezing and mode-mixing channels. The method enables a comprehensive study of temperature effects in Gaussian parameter estimation. It has been shown that the precision in parameter estimation using single-mode states can be enhanced by increasing the temperature of the probe. We show that not only higher temperature, but also larger temperature differences between modes of a Gaussian probe state can enhance the estimation precision.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

University of Nottingham

Journal

Physical Review A

Band

94

Anzahl der Seiten

14

ISSN

1050-2947

DOI

https://doi.org/10.1103/PhysRevA.94.062313

Publikationsdatum

12-2016

Peer-reviewed

Ja

ÖFOS 2012

103024 Quantenfeldtheorie, 103025 Quantenmechanik

Schlagwörter

ASJC Scopus Sachgebiete

Atomic and Molecular Physics, and Optics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/5cb0b847-e1ec-4cd3-aac8-8097b5bbb3c7