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On a New Class of Self-Referencing, 1/τ Atomic Clocks |
| WANG Li-Jun** |
1Department of Physics, Tsinghua University, Beijing 100084
2Joint Institute for Measurement Science (JMI), Tsinghua University, Beijing 100084
3Department of Precision Instrument, Tsinghua University, Beijing 100084
4National Institute of Metrology of China, Beijing 100013
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WANG Li-Jun 2014 Chin. Phys. Lett. 31 080601 |
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Abstract The merit of a modern atomic clock is measured by its phase stability. A clock's absolute time-keeping uncertainty typically worsens over its operating time τ as Δτ∝√τ, with an Allan deviation of σy (τ)=Δτ/τ∝τ?1/2. Here we analyze a new class of self-referencing clocks, whose phase is locked to itself after a certain time delay. We show that the Allan deviation of such clocks decreases as 1/τ over a long and controllable operating time. This class of clocks can maintain synchronization over a prolonged period with only a fixed, almost non-increasing, absolute uncertainty, forming an ideal time-piece.
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Published: 28 July 2014
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