Ramsey interferometry with generalized one-axis twisting echoes

verfasst von
Marius Schulte, Victor J. Martínez-Lahuerta, Maja S. Scharnagl, Klemens Hammerer
Abstract

We consider a large class of Ramsey interferometry protocols which are enhanced by squeezing and un-squeezing operations before and after a phase signal is imprinted on the collective spin of N particles. We report an analytical optimization for any given particle number and strengths of (un-)squeezing. These results can be applied even when experimentally relevant decoherence processes during the squeezing and un-squeezing interactions are included. Noise between the two interactions is however not considered in this work. This provides a generalized characterization of squeezing echo protocols, recovering a number of known quantum metrological protocols as local sensitivity maxima, thereby proving their optimality. We discover a single new protocol. Its sensitivity enhancement relies on a double inversion of squeezing. In the general class of echo protocols, the newly found over-un-twisting protocol is singled out due to its Heisenberg scaling even at strong collective dephasing.

Organisationseinheit(en)
Institut für Theoretische Physik
Institut für Gravitationsphysik
QuantumFrontiers
SFB 1227: Designte Quantenzustände der Materie (DQ-mat)
Typ
Artikel
Journal
Quantum
Band
4
Seiten
268-286
Anzahl der Seiten
19
ISSN
2521-327X
Publikationsdatum
15.05.2020
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Atom- und Molekularphysik sowie Optik, Physik und Astronomie (sonstige)
Elektronische Version(en)
https://doi.org/10.22331/q-2020-05-15-268 (Zugang: Offen)