The stability of atomic clocks operating in the optical domain is currently limited by two factors: the frequency noise of the laser used to probe the atomic system and the quantum projection noise, which intervenes when the state of this system is detected. This European QESOCAS project addresses these factors that limit uncertainties at the 10-18 level. These studies could have an impact on most clock applications and open the possibility of new applications.
Objectives
Using quantum entanglement to improve the metrological performance of optical clocks and atomic sensors
Summary
Find here the detailled description of the project:
Quantum engineered states for optical clocks and atomic sensors
Publications and communications
VALLET G., BOOKJANS E., EISMANN U., BILICKI S., LE TARGAT R. et LODEWYCK J., “A noise-immune cavity-assisted non-destructive detection for an optical lattice clock in the quantum regime”, New J. Phys., 19, 083002, 2017, DOI: 10.1088/1367-2630/aa7c84.
LODEWYCK J., BILICKI S., BOOKJANS E., ROBYR J.-L., SHI C., VALLET G., LE TARGAT R., NICOLODI D., LE COQ Y., GUÉNA J., ABGRALL M., ROSENBUSCH P. et BIZE S., “Optical to microwave clock frequency ratios with an operational strontium optical lattice clock”, Metrologia, 53, 1123, 2016, DOI: 10.1088/0026-1394/53/4/1123.
KOHLHAAS R., BERTOLDI A., CANTIN E., ASPECT A., LANDRAGIN A. et BOUYER P., “ “Phase Locking a Clock oscillator to a coherent atomic ensemble”, Phys. Rev. X, 5, 021011, 2015, DOI; 10.1103/PhysRevX.5.021011.
VANDERBRUGGEN T., KOHLHAAS R., BERTOLDI A., CANTIN E., LANDRAGIN A. et BOUYER P., “Feedback control of coherent spin states using weak nondestructive measurements”, Phys. Rev. A, 89, 063619, 2014, DOI: 10.1103/PhysRevA.89.063619.
LODEWYCK J.et al., “Prospects for sub quantum projection noise stability in strontium optical lattice clocks” Colloqium Quantum Engineering, from Fundamental Aspects to Applications (IQFA), 2016, Paris
LE TARGAT R. et al., “Towards non-destructive detection of atomic populations in a strontium Optical Lattice Clock” IFCS (International Frequency Control Symposium), 2016, New-Orleans, USA.
VALLET G.et al., “Cavity enhanced non-demolition measurement on a 87Sr lattice clock”, ETFT (European Time and Frequency Forum), 2016, York, UK.
LE TARGAT R., EISMANN U., SHI C., ROBYR J.L. et LODEWYCK J., “Cavity-enhanced non-destructive detection of atomic populations in Optical Lattice Clocks”, EFTF 2014.
EISMANN U., SHI C., ROBYR J.L., LE TARGAT R. et LODEWYCK J., “Cavity-enhanced non-destructive detection of atomic populations in Optical Lattice Clocks”, EGAS 2014.
Partners
Members of the QESOCAS European project consortium :
- PTB,
- NPL,
- INRIM,
- REG(LUH),
- REG(IQOQI),
- REG(IOGS)