All-fiber telecom band energy-time entangled biphoton source

Liu, Yuting; Xing, Jun‐Jie; Xia, Zhiguang; Quan, Runai; Hong, Huibo; Liu, Tao; Zhang, Shougang; Xiang, Xiao; Dong, Ruifang

doi:10.3788/col202321.032701

Cited by 4 publications

(1 citation statement)

References 26 publications

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“…As it has been shown that the use of a common energy-time entangled biphoton source for the bidirectional transfer is equivalent to utilizing two independent energy-time entangled biphoton source with high spectral consistency [25], a self-developed all-fiber telecom-band energy-time entangled biphoton source with a photon-pair generation rate over 8 MHz mW −1 [26] was utilized for simplification of the Q-TWTT demonstration. At the master station, the generated polarization-orthogonal photon pairs, denoted as signal (s) and idler (i), were spatially departed by a fiber polarization beam splitters into two fiber paths respectively.…”

Section: Methodsmentioning

confidence: 99%

Quantum two-way time transfer over a hybrid free-space and fiber link

Xiang,

Shi,

Quan

et al. 2023

Quantum Sci. Technol.

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As the superiority of quantum two-way time transfer (Q-TWTT) has been proved convincingly over fiber links, its implementation on free-space links becomes an urgent need for remote time transfer expanding to the transcontinental distance. In this paper, the first Q-TWTT experimental demonstration over a hybrid link of 2 km-long turbulent free-space and 7 km-long field fiber is reported. Despite the significant loss of ∼30 dB and atmospheric turbulence, reliable time transfer performance lasting for overnights has been realized with time stability in terms of time deviation far below 1 picosecond. This achievement shows the good feasibility of quantum-enhanced time transfer in the space-ground integrated optical links and nicely certifies the capability of Q-TWTT in comparing and synchronizing the state-of-the-art space microwave atomic clocks.

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Section: Methodsmentioning

confidence: 99%

Quantum two-way time transfer over a hybrid free-space and fiber link

Xiang,

Shi,

Quan

et al. 2023

Quantum Sci. Technol.

Self Cite

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Development of prototype system for quantum two-way clock synchronization

Shi,

Xiang,

Hong

et al. 2024

Applied Physics Letters

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In this Letter, we report a prototype system that realizes the complete functionality for quantum two-way time transfer, comparison, and synchronization between two integrated terminals. The synchronization performance was tested over a 50-km spooled fiber link. With the common frequency reference, the time deviation was measured as 0.45 ps at an averaging time of 104 s, which is limited by the system's hardware and determines the minimum achievable synchronization stability. By employing an open-loop fiber-optic microwave frequency transfer in combination with the technique of dynamically identifying and steering the time offset between the terminals, a synchronization stability of 1.26 ps at 104 s was achieved. Further utilizing the grey prediction model to correct the time offset data, the synchronization stability was significantly improved to 0.69 ps at 104 s, showing its potential to enhance the synchronization performance. This report marks the development of a utility quantum two-way clock synchronization system. The ongoing exploration of advanced time-offset adjustment strategies to attain synchronization stability significantly below 1 ps is poised to yield invaluable benefits for future applications.

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