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I will report our recent effort towards realizing the full potential of a many-particle clock with a state-of-the-art stable laser. We have achieved fractional stability of 2.2 × 10−16 at 1 s for the JILA Sr optical atomic clock. We have also reduced the total uncertainty of our clock to 2.1 × 10−18 in fractional frequency units. Both represent new records for the performance of an atomic clock.
Privacy-preserving comparisons over encrypted database is a hot topic in the current academic research. Recently, Furukawa [7] introduced a new primitive called request-based comparable encryption (comparable encryption for short) to achieve this target. Howver, one disadvantage of comparable encryption is that huge of the token and cipher text are required in the scheme and thus the computation and...
An improved extended evaluation method of engineering alternatives is proposed by means of extension theory. The matter-element model of the desired alternative (ideal alternative) and the matter-element models of alternatives are established according to decision-makers' knowledge or practical experience, and then the alternatives can be ranked by extended relational degrees to choose the optimal...
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