Recent Advances Concerning the 87Sr Optical Lattice Clock at the National Time Service Center

Wang, Yebing; Lu, Xiaotong; Lu, Benquan; Kong, Dehuan; Chang, Hong

doi:10.3390/app8112194

Cited by 13 publications

(8 citation statements)

References 34 publications

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“…Rabi spectroscopy. -The measurements of the atomic energies are performed by high-precision clock Rabi spectroscopy that operates at a fractional instability of 10 -15 [31]. A λ p = 698 nm the spectroscopic clock laser is locked to an ultralow-expansion cavity having a linewidth of approximately 1 Hz.…”

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confidence: 99%

Rabi Spectroscopy and Sensitivity of a Floquet Engineered Optical Lattice Clock

Yin,

Wang,

et al. 2020

Preprint

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Floquet engineering is a powerful tool to customize quantum states and Hamiltonians via timeperiodic fields. In this manuscript, we periodically modulate the lattice potential of a 87 Sr optical clock. Different from previous works where the external (spatial) single-particle energies are manipulated, we target the internal (atomic) degrees of freedom and engineer the optical clock transition. We shape Floquet quasi-energies and measure their resonance profiles with Rabi spectroscopy. We provide the spectroscopic sensitivity of each band by measuring the Fisher information and show that this is not depleted by the Floquet dynamical modulation. The demonstration that the internal degrees of freedom can be selectively engineered by manipulating the external degrees of freedom inaugurates a novel device for metrology, sensing and quantum technologies.

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confidence: 99%

Rabi Spectroscopy and Sensitivity of a Floquet Engineered Optical Lattice Clock

Yin,

Wang,

et al. 2020

Preprint

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“…We experimentally verify the validity of the DISC method based on the one-dimensional 87 Sr optical lattice clock, the details of which is described in reference [26,28]. After two-stage laser cooling, about 8 × 10 4 atoms are loaded into a horizontal one-dimensional optical lattice.…”

Section: Description Of the Experimental Setup Of 87 Sr Optical Latti...mentioning

confidence: 91%

Demonstration of the Systematic Evaluation of an Optical Lattice Clock Using the Drift-Insensitive Self-Comparison Method

Zhou

et al. 2021

Applied Sciences

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The self-comparison method is a powerful tool in the uncertainty evaluation of optical lattice clocks, but any drifts will cause a frequency offset between the two compared clock loops and thus lead to incorrect measurement result. We propose a drift-insensitive self-comparison method to remove this frequency offset by adjusting the clock detection sequence. We also experimentally demonstrate the validity of this method in a one-dimensional 87Sr optical lattice clock. As the clock laser frequency drift exists, the measured frequency difference between two identical clock loops is (240 ± 34) mHz using the traditional self-comparison method, while it is (−15 ± 16) mHz using the drift-insensitive self-comparison method, indicating that this frequency offset is cancelled within current measurement precision. We further use the drift-insensitive self-comparison technique to measure the collisional shift and the second-order Zeeman shift of our clock and the results show that the fractional collisional shift and the second-order Zeeman shift are 4.54(28) × 10−16 and 5.06(3) × 10−17, respectively.

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“…The beam waist of the lattice laser was 100 µm and the lifetime of the trapped atoms was more than 7 s. The clock laser, corresponding to the transition of 5s 2 1 S 0 →5s5p 3 P 0 at λ = 698 nm, was generated by an extended-cavity diode laser. To suppress frequency noise, the clock laser was locked to an ultralow expansion (ULE) cavity with a finesse of 200,000 using the technology of PDH (Pound-Drever-Hall) stabilization; eventually, the linewidth of the clock laser was about 1 Hz [29]. The clock laser was collimated by CL and CM with a beam waist of 2 mm at the center of the MOT and overlapped with the lattice laser beam.…”

Section: Methodsmentioning

confidence: 99%

An Evaluation of the Zeeman Shift of the 87Sr Optical Lattice Clock at the National Time Service Center

Yin

et al. 2020

Applied Sciences

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The Zeeman shift plays an important role in the evaluation of optical lattice clocks since a strong bias magnetic field is applied for departing Zeeman sublevels and defining a quantization axis. We demonstrated the frequency correction and uncertainty evaluation due to Zeeman shift in the 87Sr optical lattice clock at the National Time Service Center. The first-order Zeeman shift was almost completely removed by stabilizing the clock laser to the average frequency of the two Zeeman components of mF = ±9/2. The residual first-order Zeeman shift arose from the magnetic field drift between measurements of the two stretched-state center frequencies; the upper bound was inferred as 4(5) × 10−18. The quadratic Zeeman shift coefficient was experimentally determined as –23.0(4) MHz/T2 and the final Zeeman shift was evaluated as 9.20(7) × 10−17. The evaluation of the Zeeman shift is a foundation for overall evaluation of the uncertainty of an optical lattice clock. This measurement can provide more references for the determination of the quadratic coefficient of 87Sr.

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Recent Advances Concerning the 87Sr Optical Lattice Clock at the National Time Service Center

Cited by 13 publications

References 34 publications

Rabi Spectroscopy and Sensitivity of a Floquet Engineered Optical Lattice Clock

Rabi Spectroscopy and Sensitivity of a Floquet Engineered Optical Lattice Clock

Demonstration of the Systematic Evaluation of an Optical Lattice Clock Using the Drift-Insensitive Self-Comparison Method

An Evaluation of the Zeeman Shift of the 87Sr Optical Lattice Clock at the National Time Service Center

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