Quantum frequency standards based on soliton state of Bose-Einstein condensate

One introduces a method to stabilize frequency based on application of a soliton state of the Bose-Einstein condensate of alkali metals as an atomic source. One evaluated the critical value of the total amount of condensate particles for lithium atoms ensuring occurrence of quasi-single-dimensional soliton in condensate and evaluated lifetime of the mentioned soliton. The attainable accuracy of reference transition frequency measurement in terms of the proposed standard is shown to be essentially higher than in the widely used quantum standards of frequency