Characterization of frequency entanglement under extended phase-matching conditions

Quan, Runai; Wang, Mengmeng; Hou, Feiyan; Tai, Zhaoyang; Liu, Tao; Zhang, Shougang; Dong, Ruifang

doi:10.1007/s00340-015-6006-3

Cited by 16 publications

(13 citation statements)

References 55 publications

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“…2 . The source of frequency entangled photon-pairs (denoted as signal and idler) with orthogonal polarizations is generated based on a pulse pumped spontaneous parametric down conversion (SPDC) process 57 58 . Two optical circulators (OCA and OCB) are inserted into the signal and idler arms, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…τ represents the relative delay between the signal and idler paths. By scanning the MDL, the HOM interferometric coincidence shows a dip shape with a a visibility of 68% and a coherence time of 3 ps 58 . Although the measured HOM visibility is reduced due to the nonnegligible effect of the second-order dispersion of PPKTP, it is sufficient for balancing the the fiber paths.…”

Section: Methodsmentioning

confidence: 99%

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Demonstration of quantum synchronization based on second-order quantum coherence of entangled photons

Quan¹,

Zhai²,

Wang³

et al. 2016

Sci Rep

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Based on the second-order quantum interference between frequency entangled photons that are generated by parametric down conversion, a quantum strategic algorithm for synchronizing two spatially separated clocks has been recently presented. In the reference frame of a Hong-Ou-Mandel (HOM) interferometer, photon correlations are used to define simultaneous events. Once the HOM interferometer is balanced by use of an adjustable optical delay in one arm, arrival times of simulta- neously generated photons are recorded by each clock. The clock offset is determined by correlation measurement of the recorded arrival times. Utilizing this algorithm, we demonstrate a proof-of-principle experiment for synchronizing two clocks separated by 4 km fiber link. A minimum timing stability of 0.44 ps at averaging time of 16000 s is achieved with an absolute time accuracy of 73.2 ps. The timing stability is verified to be limited by the correlation measurement device and ideally can be better than 10 fs. Such results shine a light to the application of quantum clock synchronization in the real high-accuracy timing system.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Demonstration of quantum synchronization based on second-order quantum coherence of entangled photons

Quan¹,

Zhai²,

Wang³

et al. 2016

Sci Rep

Self Cite

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show abstract

“…In a fiber-based quantum information network, frequencyentangled photon pair source at telecom wavelength is required for minimum absorption. Several experiments on generation of frequency-correlated photon pairs at telecom wavelength have been reported [28][29][30][31] since pulse pumped SPDC can be generated and detected much more efficiently. However, in application to the entanglementbased quantum communication, their broad spectral width of the photon pairs limits the fiber transmission distance.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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“…First, the dimensionality of entangled qudits could be further improved by using more broadband twin photon sources [32]. Another important challenge is more rigorous characterization of entanglement for the generated frequency-entangled qudit states [33][34][35]. To rigorously 'prove' entanglement without modeling (assuming) physical system of the setup, one has to experimentally access some entanglement measure or separability criteria which requires state tomography or similar kind of detection.…”

Section: Resultsmentioning

confidence: 99%

Simple method of generating and distributing frequency-entangled qudits

Jin

Shimizu

Fujiwara

et al. 2016

Quantum Sci. Technol.

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High-dimensional, frequency-entangled photonic quantum bits (qudits for d-dimension) are promising resources for quantum information processing in an optical fiber network and can also be used to improve channel capacity and security for quantum communication. However, up to now, it is still challenging to prepare high-dimensional frequency-entangled qudits in experiments, due to technical limitations. Here we propose and experimentally implement a novel method for a simple generation of frequency-entangled qudts with > d 10 without the use of any spectral filters or cavities. The generated state is distributed over 15 km in total length. This scheme combines the technique of spectral engineering of biphotons generated by spontaneous parametric down-conversion and the technique of spectrally resolved Hong-Ou-Mandel interference. Our frequency-entangled qudits will enable quantum cryptographic experiments with enhanced performances. This distribution of distinct entangled frequency modes may also be useful for improved metrology, quantum remote synchronization, as well as for fundamental test of stronger violation of local realism.

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Characterization of frequency entanglement under extended phase-matching conditions

Cited by 16 publications

References 55 publications

Demonstration of quantum synchronization based on second-order quantum coherence of entangled photons

Demonstration of quantum synchronization based on second-order quantum coherence of entangled photons

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

Simple method of generating and distributing frequency-entangled qudits

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