Comparison of two independent Sr optical clocks with 1×10(-17) stability at 10(3) s.

  title={Comparison of two independent Sr optical clocks with 1×10(-17) stability at 10(3) s.},
  author={Travis L. Nicholson and M. J. Martin and J. R. Williams and B. J. Bloom and Michael Bishof and Matthew D. Swallows and S. L. Campbell and J. Ye},
  journal={Physical review letters},
  volume={109 23},
Many-particle optical lattice clocks have the potential for unprecedented measurement precision and stability due to their low quantum projection noise. However, this potential has so far never been realized because clock stability has been limited by frequency noise of optical local oscillators. By synchronously probing two ^{87}Sr lattice systems using a laser with a thermal noise floor of 1×10(-15), we remove classically correlated laser noise from the intercomparison, but this does not… 

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