An efficient source of frequency anti-correlated entanglement at telecom wavelength

Hou, Feiyan; Xiang, Xiao; Quan, Runai; Wang, Mengmeng; Zhai, Yan; Wang, Shaofeng; Liu, Tao; Zhang, Shougang; Dong, Ruifang

doi:10.1007/s00340-016-6402-3

Cited by 13 publications

(4 citation statements)

References 55 publications

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“…The single photon spectral result when the filter is fully open is also measured. The measured temporal width is 818.6 ps and the corresponding bandwidth is 3.12 nm which is close to the result measured by the monochromator [13]. The nonlocal mapping results are plotted in Fig.…”

Section: Resultssupporting

confidence: 82%

The comparison between the local and nonlocal entangled wavelength to time mapping

Yang

Xiang

Jin

et al. 2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

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The dispersive wavelength to time mapping with the entangled photon source is an effective way of measuring the spectral information of the entangled photon pairs. This approach avoids the usage of spectral filtering equipment like the monochromator, which reduces the measuring time and the system's complexity. The wavelength-to-time mapping method can be divided into local mapping and nonlocal mapping depending on whether the measurement utilizes the frequency correlation of the entangled photon pairs. For local mapping, the spectral information of signal photons is directly mapped to the time domain through dispersion without utilizing the frequency correlation between the photon pair. For nonlocal mapping, the signal photons with spectral information are directly detected. And the corresponding idler photons are dispersed. With the help of the frequency correlation between the photon pair, the spectral information on signal photons can be recorded in count measurement. In this letter, the two types of mapping results are theoretically and experimentally compared. The theoretical result indicates that the two types of mapping results are the same when the pump light of the entangled source is ideal monochromatic with infinite linewidth. However, when using a real pump light with finite linewidth, the theoretical and experimental result of the two types of mapping is different. The difference in the result indicates the potential influence of the mapping method, which can further help to select a more suitable mapping method for different measuring conditions.

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Section: Resultssupporting

confidence: 82%

The comparison between the local and nonlocal entangled wavelength to time mapping

Yang

Xiang

Jin

et al. 2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

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show abstract

“…2. To generate the frequency-entangled photon-pair sources, a quasimonochromatic 780-nm laser was produced by the cavitybased frequency doubling process [43] and then split into two beams by a 50 : 50 beam splitter (BS). Each beam was focused into a type-II PPKTP crystal of length 10 mm and a poling period of 46.146 µm.…”

Section: Methodsmentioning

confidence: 99%

Fiber-optic two-way quantum time transfer with frequency-entangled pulses

et al. 2019

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High-precision time transfer is of fundamental interest in physics and metrology. Quantum time transfer technologies that use frequency-entangled pulses and their coincidence detection have been proposed, offering potential enhancements in precision and better guarantees of security. In this paper, we describe a fiber-optic two-way quantum time transfer experiment. Using quantum nonlocal dispersion cancellation, time transfer over a 20-km fiber link achieves a time deviation of 922 fs over 5 s and 45 fs over 40960 s. The time transfer accuracy as a function of fiber lengths from 15 m to 20 km is also investigated, and an uncertainty of 2.46 ps in standard deviation is observed. In comparison with its classical counterparts, the fiber-optic two-way quantum time transfer setup shows appreciable improvement, and further enhancements could be obtained by using new event timers with sub-picosecond precision and single-photon detectors with lower timing jitter for optimized coincidence detection. Combined with its security advantages, the femtosecond-scale two-way quantum time transfer is expected to have numerous applications in high-precision middle-haul synchronization systems.

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“…To demonstrate this nonlocal temporal correlation identification algorithm, a frequency entangled photon source was utilized. The photon pairs with orthogonal polarizations were departed by a fiber polarization beam splitter [16]. The signal photons were detected by a single photon detector [17,18] and the timing information were recorded by an event timer (A033ET, Eventech Ltd) consequently.…”

Section: Experimental Implementationmentioning

confidence: 99%

High-precision nonlocal temporal correlation identification of entangled photon pairs for quantum clock synchronization

Quan

Don

Xiang

et al. 2020

Review of Scientific Instruments

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The ability to identify the correlation in the remotely departed entangled photon pairs is critical to measure the time difference for subsequent synchronization between independent time scales. The first remote correlation detection was reported in 2009, which extracts the time difference via the algorithm of iterative fast Fourier transformations (FFTs) and their inverse.Based on this algorithm, the resolution is restricted due to the pre-processing program of the time sequences. In this paper an improved algorithm is proposed both in the resolution and time difference precision, which realizes well-performed coincidence identification with a flexible resolution down to 1 ps. With a common time scale reference, the measured time offset between two timing signals detected nonlocally has achieved a standard deviation of 0.72 ps. This implementation provides a solid basis for the applications of entanglement-based quantum technologies in the systems of high-precision clock synchronization, ranging system and quantum communications.

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An efficient source of frequency anti-correlated entanglement at telecom wavelength

Cited by 13 publications

References 55 publications

The comparison between the local and nonlocal entangled wavelength to time mapping

The comparison between the local and nonlocal entangled wavelength to time mapping

Fiber-optic two-way quantum time transfer with frequency-entangled pulses

High-precision nonlocal temporal correlation identification of entangled photon pairs for quantum clock synchronization

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