Die u:cris Detailansicht:

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