Observatoire De Paris

Institut D'optique Graduate School

Centre National De La Recherche Scientifique

Cnrs

Ixsea

Muquans

Centre National De La Recherche Scientifique-Cnrs

Ixblue

Arnaud Landragin

Philippe Bouyer

Bruno Desruelle

Vincent Josse

Andrea Bertoldi

William Guerin

Ralf Kohlhaas

Juliette Billy

Philippe Luc Bouyer

William Guérin

Coherent spectroscopic methods are described, to measure the total phase difference during an extended interrogation interval between the signal delivered by a local oscillator () 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 (&#x3c6;) 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 ((i)) so as to avoid that the phase difference approaches the limit of the inversion region; reading out a final phase difference (&#x3c6;f) 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 (&#x3c6;f) and the opposite of all the applied phase corrections figure (I).

Coherent spectroscopic methods with extended interrogation times and systems implementing such methods

A cold atom gravity gradiometer system includes a laser source that generates a laser beam that propagates along a propagation direction. The system further includes a reflector that reflects a portion of the laser beam and transmits another portion of the laser beam (the transmitted portion). A second reflector spatially separated from the first reflector along the propagation direction reflects the transmitted portion of the laser beam.

Cold atom gravity gradiometer

The disclosure relates to a cold atom interferometry sensor that includes: a source of atoms; a dual-frequency laser capable of generating a first Raman dual-frequency laser beam; a reflector arranged so as to reflect the first Raman dual-frequency laser beam in order to generate a second Raman dual-frequency laser beam, the first laser beam and the second laser beam propagating in different directions in order to obtain atomic interference fringes from the emission of cold atoms obtained from the atom source; characterized in that the reflector is further arranged so as to enable multiple reflections of the first beam on surfaces of the reflector, so that the first beam and the multiple reflections thereof allow the capture of atoms from the atom source in order to obtain the cold atoms.

Cold atom interferometry sensor

A guided coherent atom source () includes elements for generating neutral atoms in a gaseous state (), elements for cooling the atoms gas (), elements for generating a magnetic field (), including an electro-magnetic micro-chip () deposited on a surface () of a substrate (), and capable of condensing the atoms in a magnetic trap, elements for generating an electro-magnetic RF field capable of extracting the condensed atoms, optical elements () for emitting and directing an optical coherent beam () toward the condensed atoms able to guide the condensed atoms, characterized in that the optical elements () and the electro-magnetic micro-chip () are integrated onto the same substrate (). An atomic interferometer using such a source is also disclosed.

Guided coherent atom source and atomic interferometer

Growing community of inventors

Orsay, France

Arnaud Landragin