[1] Q. Shen, J.-Y. Guan, J.-G. Ren, T. Zeng, L. Hou, M. Li, Y. Cao, J.-J. Han, M.-Z. Lian, Y.-W. Chen, X.-X. Peng, S.-M. Wang, D.-Y. Zhu, X.-P. Shi, Z.-G. Wang, Y. Li, W.-Y. Liu, G.-S. Pan, Y. Wang, Z.-H. Li, J.-C. Wu, Y.-Y. Zhang, F.-X. Chen, C.-Y. Lu, S.-K. Liao, J. Yin, J.-J. Jia, C.-Z. Peng, H.-F. Jiang, Q. Zhang, J.-W. Pan. Free-space dissemination of time and frequency with 10⁻¹⁹ instability over 113  km. Nature, 610, 661-666(2022).

[2] J.-D. Deschênes, L. C. Sinclair, F. R. Giorgetta, W. C. Swann, E. Baumann, H. Bergeron, M. Cermak, I. Coddington, N. R. Newbury. Synchronization of distant optical clocks at the femtosecond level. Phys. Rev. X, 6, 021016(2016).

[3] M. Xin, K. Safak, F. X. Kärtner. Ultra-precise timing and synchronization for large-scale scientific instruments. Optica, 5, 1564-1578(2018).

[4] Q. Shen, J.-Y. Guan, T. Zeng, Q.-M. Lu, L. Huang, Y. Cao, J.-P. Chen, T.-Q. Tao, J.-C. Wu, L. Hou, S.-K. Liao, J.-G. Ren, J. Yin, J.-J. Jia, H.-F. Jiang, C.-Z. Peng, Q. Zhang, J.-W. Pan. Experimental simulation of time and frequency transfer via an optical satellite–ground link at 10⁻¹⁹ instability. Optica, 8, 471-476(2021).

[5] Y. Shen, S. Mazuelas, M. Z. Win. Network navigation: theory and interpretation. IEEE J. Sel. Areas Commun., 30, 1823-1834(2012).

[6] J. Neil, L. Cosart, G. Zampetti. Precise timing for vehicle navigation in the smart city: an overview. IEEE Commun. Mag., 58, 54-59(2020).

[7] B. Jaduszliwer, J. Camparo. Past, present and future of atomic clocks for GNSS. GPS Solutions, 25, 27(2021).

[8] P. Zhang, R. Tu, X. Lu, Y. Gao, F. Lihong. Performance of global positioning system precise time and frequency transfer with integer ambiguity resolution. Meas. Sci. Technol., 33, 045005(2022).

[9] Q. An. Review of methods and techniques of precise time interval measurements for particle physics experiments. Nucl. Tech., 29, 453-462(2006).

[10] B. M. Roberts, G. Blewitt, C. Dailey, M. Murphy, M. Pospelov, A. Rollings, J. Sherman, W. Williams, A. Derevianko. Search for domain wall dark matter with atomic clocks on board global positioning system satellites. Nat. Commun., 8, 1195(2017).

[11] N. Huntemann, B. Lipphardt, C. Tamm, V. Gerginov, S. Weyers, E. Peik. Improved limit on a temporal variation of m_p/m_e from comparisons of Yb⁺ and Cs atomic clocks. Phys. Rev. Lett., 113, 210802(2014).

[12] A. Derevianko, M. Pospelov. Hunting for topological dark matter with atomic clocks. Nat. Phys., 10, 933-936(2014).

[13] J. Liu, X. Chen, X. Ji. Current status of direct dark matter detection experiments. Nat. Phys., 13, 212-216(2017).

[14] J. C. Berengut, V. V. Flambaum. Testing time-variation of fundamental constants using a 229th nuclear clock. Nuclear Phys. News, 20, 19-22(2010).

[15] M. Safronova, D. Budker, D. DeMille, D. F. J. Kimball, A. Derevianko, C. W. Clark. Search for new physics with atoms and molecules. Rev. Mod. Phys., 90, 025008(2018).

[16] Y. V. Stadnik, V. V. Flambaum. Searching for dark matter and variation of fundamental constants with laser and maser interferometry. Phys. Rev. Lett., 114, 161301(2015).

[17] K. Józef. Review of methods for time interval measurements with picosecond resolution. Metrologia, 41, 17(2004).

[18] I. P. Dan. Review of sub-nanosecond time-interval measurements. IEEE Trans. Nucl. Sci., 20, 36-51(1973).

[19] J. Zhao, Z. Zhao, L. Fu. Research on the high resolution precision time-interval measurement methods. Proc. Eng., 174, 1257-1261(2017).

[20] S. Henzler. Time-to-Digital Converter Basics(2010).

[21] X. Ren, X. F. Zhang. Methods of high precision time-interval measurement. 4th International Conference on Electronic Information Technology and Computer Engineering (EITCE)(2020).

[22] J. P. Jansson, A. Mantyniemi, J. Kostamovaara. A CMOS time-to-digital converter with better than 10 ps single-shot precision. IEEE J. Solid-State Circuits, 41, 1286-1296(2006).

[23] D. W. Allan, H. Daams. Picosecond time difference measurement system. Symposium on Frequency Control(1975).

[24] N. R. Newbury. Searching for applications with a fine-tooth comb. Nat. Photonics, 5, 186-188(2011).

[25] J. L. Hall. Nobel lecture: defining and measuring optical frequencies. Rev. Mod. Phys., 78, 1279-1295(2006).

[26] H. Margolis, G. Barwood, G. Huang, H. Klein, S. Lea, K. Szymaniec, P. Gill. Hertz-level measurement of the optical clock frequency in a single ⁸⁸Sr⁺ ion. Science, 306, 1355-1358(2004).

[27] S. A. Diddams, T. Udem, J. Bergquist, E. Curtis, R. Drullinger, L. Hollberg, W. M. Itano, W. Lee, C. Oates, K. Vogel. An optical clock based on a single trapped ¹⁹⁹Hg⁺ ion. Science, 293, 825-828(2001).

[28] H. Bergeron, L. C. Sinclair, W. C. Swann, I. Khader, K. C. Cossel, M. Cermak, J.-D. Deschênes, N. R. Newbury. Femtosecond time synchronization of optical clocks off of a flying quadcopter. Nat. Commun., 10, 1819(2019).

[29] Q. Lu, Q. Shen, J. Guan, M. Li, J. Chen, S. Liao, Q. Zhang, C. Peng. Sensitive linear optical sampling system with femtosecond precision. Rev. Sci. Instrum., 91, 035113(2020).

[30] E. D. Caldwell, L. C. Sinclair, N. R. Newbury, J.-D. Deschenes. The time-programmable frequency comb and its use in quantum-limited ranging. Nature, 610, 667-673(2022).

[31] M. Kajima, K. Minoshima. A simple optical-zooming positioning system using a femtosecond frequency comb. Conference on Lasers & Electro-Optics(2009).

[32] M. Kajima, K. Minoshima. Optical zooming interferometer for subnanometer positioning using an optical frequency comb. Appl. Opt., 49, 5844-5850(2010).

[33] I. Coddington, W. C. Swann, L. Nenadovic, N. R. Newbury. Rapid and precise absolute distance measurements at long range. Nat. Photonics, 3, 351-356(2009).

[34] G. Marra. Transfer of optical frequency combs over optical fibre links(2013).

[35] W. Zhang, T. Li, M. Lours, S. Seidelin, G. Santarelli, Y. L. Coq. Amplitude to phase conversion of InGaAs pin photo-diodes for femtosecond lasers microwave signal generation. Appl. Phys. B, 106, 301-308(2012).

[36] Z. Jin, Y. Xu, D. Yu, B. Luo, Z. Chen, G. Wu, H. Guo. Analyzing the influence of InGaAs photodetectors in comb-based frequency transfer. Frontiers in Optics + Laser Science(2022).

[37] J. Kim, F. X. Kärtner, M. H. Perrott. Femtosecond synchronization of radio frequency signals with optical pulse trains. Opt. Lett., 29, 2076-2078(2004).

[38] K. Jung, J. Kim. Subfemtosecond synchronization of microwave oscillators with mode-locked Er-fiber lasers. Opt. Lett., 37, 2958-2960(2012).

[39] J. Kim, J. A. Cox, J. Chen, F. X. Kärtner. Drift-free femtosecond timing synchronization of remote optical and microwave sources. Nat. Photonics, 2, 733-736(2008).

[40] F. R. Giorgetta, W. C. Swann, L. C. Sinclair, E. Baumann, I. Coddington, N. R. Newbury. Optical two-way time and frequency transfer over free space. Nat. Photonics, 7, 434-438(2013).

[41] G. P. Agrawal. Nonlinear Fiber Optics(2000).