Strontium Ion Optical Clocks at NPL
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Optical frequency standards offer a step improvement of one to two orders of magnitude in the future ability to realise the SI second .
The NPL strontium ion optical clock project  is targeted on creating systems with better performance than microwave clocks, for both space  and terrestrial environments.
Recent activities have centred on compact transportable system development and long-term unattended operation with quantum-limited performance.
One ring and two end-cap 88Sr+ trap systems based on the 2S1/2 - 2D5/2 674 nm optical-clock quadrupole transition are under development.