Coherent spectroscopic methods with extended interrogation times and systems implementing such methods
US10041835B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 18, 2015 |
| Grant date | Aug 7, 2018 |
| Priority date | — |
| Expiry date | Dec 18, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B2290/55
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Coherent spectroscopic methods are described, to measure the total phase difference during an extended interrogation interval between the signal delivered by a local oscillator (10) and that given by a quantum system (QS). According to one or more embodiments, the method may comprise reading out at the end of successive interrogation sub-intervals (Ti) intermediate error signals corresponding to the approximate phase difference (φ) between the phase of the LO signal and that of the quantum system, using coherence preserving measurements; shifting at the end of each interrogation sub-intervals (Ti) the phase of the local oscillator signal, by a known correction value (φ(i)FB) so as to avoid that the phase difference approaches the limit of the inversion region; reading out a final phase difference (φf) between the phase of the prestabilized oscillator signal and that of the quantum system using a precise measurement with no restriction on the destruction; reconstructing a total phase difference over the extended interrogation interval, as the sum of the final phase difference (φf) and the opposite of all the applied phase corrections figure (I).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.