Minimizing the frequency correlation of photon pairs in photonic crystal fibers

Cui, Liang; Li, Xiaoying; Zhao, Ningbo

doi:10.1088/1367-2630/14/12/123001

Cited by 31 publications

(22 citation statements)

References 33 publications

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“…The pulse duration of the pump is ∼ 4.6 ps, corresponding to a linear chirp of C p = 0.84. Note that the existing of chirp will decrease the value ofḡ (2) s(i) [26]. The pump power is controlled by a fiber polarization controller (FPC1) and a fiber polarization beam splitter (FPBS1).…”

Section: Experimental Implementation and Resultsmentioning

confidence: 99%

“…This detrimental effect of passive optical filters leads to the idea of spectral engineering parametric processes to achieve factorization without filtering [15,16]. Tremendous efforts were spent through the years along this line, including the employment of photonic grating for active temporal mode shaping [22], special selection of χ (2) -nonlinear crystals with desired properties [18], engineering of the dispersion of nonlinear optical fibers [23][24][25][26][27], and engineering of the structure of nonlinear photonic crystals [28,29]. While most sources were successful to some extent, many are limited to a specific wavelength range of operation due to strict requirement on dispersion and phase matching.…”

Section: Introductionmentioning

confidence: 99%

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Versatile and precise quantum state engineering by using nonlinear interferometers

Su¹,

Cui²,

Li³

et al. 2019

Opt. Express

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The availability of photon states with well-defined temporal modes is crucial for photonic quantum technologies. Ever since the inception of generating photonic quantum states through pulse pumped spontaneous parametric processes, many exquisite efforts have been put on improving the modal purity of the photon states to achieve single-mode operation. However, because the nonlinear interaction and linear dispersion are often mixed in parametric processes, limited successes have been achieved so far only at some specific wavelengths with sophisticated design. In this paper, we resort to a different approach by exploiting an active filtering mechanism originated from interference fringe of nonlinear interferometer. The nonlinear interferometer is realized in a sequential array of nonlinear medium, with a gap in between made of a linear dispersive medium, in which the precise modal control is realized without influencing the phase matching of the parametric process. As a proof-of-principle demonstration of the capability, we present a photon pairs source using a two-stage nonlinear interferometer formed by two identical nonlinear fibers with a standard single mode fiber in between. The results show that spectrally correlated two-photon state via four wave mixing in a single piece nonlinear fiber is modified into factorable state and heralded single-photons with high modal purity and high heralding efficiency are achievable. This novel quantum interferometric method, which can improve the quality of the photon states in almost all the aspects such as modal purity, heralding efficiency, and flexibility in wavelength selection, is proved to be effective and easy to realize.

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Section: Experimental Implementation and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Versatile and precise quantum state engineering by using nonlinear interferometers

Su¹,

Cui²,

Li³

et al. 2019

Opt. Express

Self Cite

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show abstract

“…The effect on the orientation of the phasematching function due to the dispersion of the PCF has been studied extensively by a number of groups [69,[101][102][103][104][105] . All considerations focus on achieving a factorable state by determining under what conditions the joint spectral amplitude function can be made to be separable.…”

Section: Spectral Engineering Of the Two-photon Statementioning

confidence: 99%

Active Multiplexing of Spectrally Engineered Heralded Single Photons in an Integrated Fibre Architecture

Francis-Jones

2017

Springer Theses

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In recent years, there has been rapid development in processing of quantum information using quantum states of light. The focus is now turning towards developing real-world implementations of technologies such as all-optical quantum computing and cryptography. The ability to consistently create and control the required single photon states of light is crucial for successful operation. Therefore, high performance single photon sources are very much in demand.The most common approach of generating the required nonclassical states of light is through spontaneous photon pair generation in a nonlinear medium. One photon in the pair is detected to "herald" the presence of the remaining single photon. For many applications the photons are required to be in pure indistinguishable states. However, photon pairs generated in this manner typically suffer from spectral correlations, which can lead to the production of mixed, distinguishable states. Additionally, these sources are probabilistic in nature, which fundamentally limits the number of photons that can be delivered simultaneously by independent sources and hence the scalability of these future technologies.One route to deterministic operation is by actively multiplexing several independent sources together to increase the probability of delivering a single photon from the system. This thesis presents the development and analysis of a multiplexing scheme of heralded single photons in high-purity indistinguishable states within an integrated optical fibre system. The spectral correlations present between the two photons in the pair were minimised by spectrally engineering each photonic crystal fibre source. A novel, in-fibre, broadband filtering scheme was implemented using photonic bandgap fibres. In total, two sources were multiplexed using a fast optical switch, yielding an 86% increase in the heralded count rate from the system. AcknowledgementsI would first like to express my gratitude to my supervisor Dr. Peter Mosley, for giving me the opportunity to work with him on an exciting and interesting project, and for first introducing me to the world of quantum optics in the final year of my undergraduate degree. Without his support and guidance over the last three years, this thesis and the work that it contains would not have been possible. It has been a tremendously enjoyable learning experience (for both of us I hope!), and I think I can safely say that I now know more about FPGAs than I ever thought or hoped I would! I am incredibly grateful for the opportunity, and eagerly look forward to continue working with you on the upcoming NQIT project.Secondly, I would like to thank all of the staff and students, past and present, of the Centre for Photonics and Photonic Materials for providing an enjoyable, interesting and supportive learning environment. I would particularly like to thank James, for casting his eye over my fibre designs, passing down his fabrication knowledge, and teaching me the dark art of the dispersion rig! I would also especially like to ...

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“…It has then been noted that this provides a simple and rapid measure of the degree of purity of SPSs [29]. A few experimental works have used this technique to estimate the spectral purity [30][31][32][33][34] but the purity estimated in these works was not rigorously compared with the visibility of the quantum interference, the purity estimated from joint-spectral-intensity (JSI), or theoretical predictions, thus leaving questions as to the reliability of this technique. In addition, the validity of this method in the presence of noise is scarcely discussed [35].…”

Section: Introductionmentioning

confidence: 99%

Estimating the Indistinguishability of Heralded Single Photons Using Second-Order Correlation

et al. 2019

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Integrated quantum photonics is a promising strand of research that involves guiding light in submicronscale structures and utilizing the quantum properties of the fundamental particle of light-the photon. One of these quantum properties, the indistinguishability of the photons, is used to achieve high-visibility quantum interference, which is one of the key resources in photonic quantum information processing. Here, we demonstrate that the faster and simpler heralded and unheralded second-order correlation functions (g (2)) estimate the visibility (indistinguishability) well without the need to perform laborious and time-consuming quantum-interference measurements.

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Minimizing the frequency correlation of photon pairs in photonic crystal fibers

Cited by 31 publications

References 33 publications

Versatile and precise quantum state engineering by using nonlinear interferometers

Versatile and precise quantum state engineering by using nonlinear interferometers

Active Multiplexing of Spectrally Engineered Heralded Single Photons in an Integrated Fibre Architecture

Estimating the Indistinguishability of Heralded Single Photons Using Second-Order Correlation

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