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Application and Comparison of FPGA-Based Carry Chain TDC and DDMTD Schemes in High-Precision Time Synchronization. [PDF]
Sensors (Basel)Huang Y, Yu J, Xia W, Guo Q, Huang L.
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ATOMIC CLOCKS AND COLD ATOM SCATTERING
Laser Spectroscopy, 2002We demonstrate a Rb fountain clock which has a small cold collision shift that is cancelled by detuning the microwave cavity. To further enhance the stability and accuracy, we are currently developing a new state detection technique that directly measures population differences and are juggling atoms in the fountain. Fountain clocks also enable a novel
Fertig, C. +5 more
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Atomic and gravitational clocks
Nature, 1982Atomic and gravitational clocks are governed by the laws of electrodynamics and gravity, respectively. While the strong equivalence principle (SEP) assumes that the two clocks have been synchronous at all times, recent planetary data seem to suggest a possible violation of the SEP.
V. M. Canuto, I. Goldman
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CHARACTERIZATION OF NONSTATIONARY ATOMIC CLOCKS
Fluctuation and Noise Letters, 2007Atomic clocks are the core of a navigation system. Since an error in time results in an error in the user localization, it is fundamental that the stability is very high and constant with time. In this paper we discuss the dynamic Allan variance, or DAVAR, a representation of the time-varying stability of an atomic clock.
GALLEANI L., TAVELLA, PATRIZIA
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Entanglement on an optical atomic-clock transition [PDF]
Nature, 2020 State-of-the-art atomic clocks are based on the precise detection of the energy difference between two atomic levels, which is measured in terms of the quantum phase accumulated over a given time interval1-4. The stability of optical-lattice clocks (OLCs) is limited both by the interrupted interrogation of the atomic system by the local-oscillator ...
Edwin Pedrozo-Peñafiel +2 more
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Synchronized to an optical atomic clock
Science, 2020Microwave generation using optical frequency comb technology hits new ...
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Detection of Anomalies in the Behavior of Atomic Clocks
IEEE Transactions on Instrumentation and Measurement, 2007In this paper, the problem of identifying variations in the nature of atomic clock noise is addressed. Two methods are proposed. One method is based on a generalized likelihood ratio test (GLRT), and the other is based on the dynamic Allan variance (DAVAR), which is a representation of the instantaneous clock stability that is able to point out ...
Emilia Nunzi +3 more
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