Free-space dissemination of time and frequency with 10−19 instability over 113 km

Shen, Qi; Guan, Jian-Yu; Ren, Ji-Gang; Zeng, Ting; Hou, Lei; Li, Min; Cao, Yuan; Han, Jiangping; Lian, Meng-Zhe; Chen, Yanwei; Peng, Xinxin; Wang, Shao-Mao; Zhu, Dan; Shi, Xinbao; Wang, Zhengguo; Li, Ye; Liu, Weiyue; Pan, Ge-Sheng; Wang, Yong; Li, Zhaohui; Wu, Jincai; Zhang, Yanyan; Chen, Faxi; Lu, Chao‐Yang; Liao, Sheng-Kai; Yin, Juan; Jia, Jianjun; Peng, Cheng-Zhi; Jiang, Hai-Feng; Zhang, Qiang; Pan, Jian-Wei

doi:10.1038/s41586-022-05228-5

Cited by 49 publications

(14 citation statements)

References 39 publications

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“…The synchronization of two clocks 28 km apart below 1 fs within 100 s, even at high Doppler velocities of up to ±24 m s −1 , and under stable weather conditions has been shown [78]. A comparison at 113 km with modified Allan deviation of 10 −19 at 10 4 s was also reported [79], the first evidence of the method compatibility with Low Earth Orbit satellites. Figure 3 indicates both results.…”

Section: Tf Transfermentioning

confidence: 85%

Roadmap towards the redefinition of the second

Dimarcq,

Gertsvolf,

Mileti

et al. 2024

Metrologia

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This paper outlines the roadmap towards the redefinition of the second, which was recently updated by the CCTF Task Force created by the CCTF in 2020. The main achievements of optical frequency standards (OFS) call for reflection on the redefinition of the second, but open new challenges related to the performance of the optical frequency standards, their contribution to time scales and UTC, the possibility of their comparison, and the knowledge of the Earth’s gravitational potential to ensure a robust and accurate capacity to realize a new definition at the level of 10-18 uncertainty. The mandatory criteria to be achieved before redefinition have been defined and their current fulfilment level is estimated showing the fields that still needed improvement. The possibility to base the redefinition on a single or on a set of transitions has also been evaluated. The roadmap indicates the steps to be followed in the next years to be ready for a sound and successful redefinition.

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Section: Tf Transfermentioning

confidence: 85%

Roadmap towards the redefinition of the second

Dimarcq,

Gertsvolf,

Mileti

et al. 2024

Metrologia

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“…On the other hand, reference [18] realized stable freespace optical frequency transfer under the link loss of up to 89 dB, which is equivalent to the loss of optical signals transfer over a 3.2 × 10 5 -km-long vacuum on condition that we choose a wavelength of 1550 nm along with a laser beam divergence angle of 22 µrad and a receiving aperture of 250 mm. To demonstrate the feasibility of atmospheric optical frequency transfer in motion, our study focuses on the suppression of the Doppler frequency shift in one-dimensional motion between the transmitting and receiving apertures.…”

Section: Simulation and Experimental Setup 21 Simulation And Analysis...mentioning

confidence: 99%

“…For future satellite-to-ground optical clocks' comparisons, Shen et al performed a 16-km free-space optical time and frequency transmission and achieved an instability of 4 × 10 −18 at 3000 s. [17] The link loss, 72 dB, is comparable to the loss between the ground station and the geostationary orbit (GEO) satellite. Recently, they have also achieved time and frequency propagation as long as 113 km on the free space link, with instability less than 4 × 10 −19 at 10 4 s. [18] High power optical frequency combs and large aperture Cassegrain reflectors were used to reduce large link loss. This work has been perceived not only to be used for ground-based applications, but for future satellite time and frequency transmission.…”

Section: Introductionmentioning

confidence: 99%

Robust free-space optical frequency transfer in time-varying link distances conditions

Tong 童,

Liu 刘,

Wang 王

et al. 2024

Chinese Phys. B

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Future inter-satellite clock comparison on high orbit will require technology of optical time and frequency transmission between moving objects. Here we demonstrate robust optical frequency transfer in variable link distance conditions. This variable link is accomplished by the relative motion of a single telescope fixed on the experimental platform and a corner-cube reflector (CCR) installed on a sliding guide. Two acoustooptic modulators with different frequencies are used to separate forward and backward signals. With active phase noise suppression, we achieve an optimal frequency stability indoor of 1.9×10-16 at 1 s and 7.9×10-19 at 1000 s while the CCR is moving back and forth with a uniform velocity of 20 cm/s and acceleration and deceleration of 20 cm/s2. This work paves the way for future research on optical frequency transfer between ultra-high-orbit satellites.

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“…) T , and c(e+p) TT , and 10 −4 for α(ā n eff ) T , and cn TT . With the development of high-precision time and frequency transfer technologies [116][117][118], clock comparisons in future space missions have great potential to improve the constraints on these SME parameters.…”

Section: Frequency Shift and Lorentz Violationmentioning

confidence: 99%

Testing Lorentz symmetry with space-based gravitational-wave detectors

Qin,

Ke,

et al. 2023

Class. Quantum Grav.

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Lorentz symmetry (LS), one of the most fundamental physical symmetries, has been extensively studied in the context of quantum gravity and unification theories. Many of these theories predict a LS violation, which could arise from the discreteness of spacetime, or extra dimensions. Standard-model extension (SME) is an effective field theory to describe Lorentz violation whose effects can be explored using precision instruments such as atomic clocks and gravitational-wave (GW) detectors. Considering the pure-gravity sector and matter-gravity coupling sector in the SME, we studied the leading Lorentz-violating modifications to the time delay of light and the relativistic frequency shift of the clock in the space-based GW detectors. We found that the six data streams from the GW mission can construct various combinations of measurement signals, such as single-arm round-trip path, interference path, triangular round-trip path, etc. These measurements are sensitive to the different combinations of SME coefficients and provide novel linear combinations of SME coefficients different from previous studies. Based on the orbits of TianQin, LISA, and Taiji missions, we calculated the response of Lorentz-violating effects on the combinations of the measurement signal data streams. Our results allow us to estimate the sensitivities for SME coefficients: $10^{-6}$ for the gravity sector coefficient $\bar{s}^{TT}$, $10^{-6}$ for matter-gravity coupling coefficients $(\bar{a}^{(e+p)}_{\text{eff}})_{T}$ and $\bar{c}^{(e+p)}_{TT}$, and $10^{-5}$ for $(\bar{a}^{n}_{\text{eff}})_{T}$ and $\bar{c}^{n}_{TT}$.

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Free-space dissemination of time and frequency with 10−19 instability over 113 km

Cited by 49 publications

References 39 publications

Roadmap towards the redefinition of the second

Roadmap towards the redefinition of the second

Robust free-space optical frequency transfer in time-varying link distances conditions

Testing Lorentz symmetry with space-based gravitational-wave detectors

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