Enhancement of continuous-variable hyperentanglement by optimizing pump mode

Li, Juan; Li, Jiaming; Cai, Chun-Xiao; Sun, Hengxin; Liu, Kui; Gao, Jiangrui

doi:10.7498/aps.68.20181625

Cited by 3 publications

(1 citation statement)

References 29 publications

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“…Based on previous research, it was confirmed that adding nanographene sheets to n-octadecane can effectively enhance its thermal conductivity. When the mass fraction of nanographene sheets is 2wt.%, the thermal conductivity of phase change materials increases by 89.4% [24].…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulation of thermal properties of modified graphene / n-octadecane composite phase change material

Li,

Mao,

Yang

et al. 2024

J. Phys.: Conf. Ser.

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Phase change materials have been widely used in building energy-saving and off-peak energy storage systems, but most phase change materials limit their application because of their low thermal conductivity. Improving their heat transfer performance and revealing the heat transfer mechanism from a microscopic perspective are the keys to practical applications. The PCM system composed of n-octadecane and modified graphene was established by molecular dynamics simulation and the influence of macro thermal properties was analyzed from a microscopic perspective including end-to-end distance and torsional angle distribution, radial distribution function, and self-diffusion coefficient. The results show that the thermal conductivity of PCMS increases with increased modified graphene content. When the mass fraction is 26.88%, the thermal conductivity increases by 44.5%, which is consistent with the trend of experimental values. The addition of modified graphene resulted in a more concentrated distribution of n-octadecane molecules, indicating that the arrangement of n-octadecane molecules was affected, increasing the thermal conductivity of n-octadecane. The deviation of phase transition temperature from the experimental value is less than 1%.

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Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulation of thermal properties of modified graphene / n-octadecane composite phase change material

Li,

Mao,

Yang

et al. 2024

J. Phys.: Conf. Ser.

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Quantum Network Communication Based on Voice-Control Technology

Yibin

2024

Preprint

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Quantum network communication based on quantum entanglement properties has been realised. However, the realisation of a multi-horizontal and multi-vertical global network system is still difficult, and there is less relevant literature and reports on exploring the interconnectivity of quantum systems with people and everything. This paper explores the possibility of communicating with living bodies, non-living bodies through the human voice in the quantum induction network. This paper discusses the relationship between thinking consciousness and entangled quantum, and put forward the following point of view: that weak magnetic fields generated through a certain quantum spin waves can interact with magnetic fields generated by other quantum spins to produce induced waves, and then the induction waves are connected to each other to form a quantum induction network, so as to transmit information. And proposed that the human sound wave can resonate with the spin wave generated by a certain quantum and be instantaneously transmitted to another quantum with entanglement relationship with the quantum, no matter how far they are from each other. To achieve the purpose of communication between human body and life bodies and non-life bodies. A corresponding research plan is designed, taking the control of a remote device by people's voice as an example to conduct a thought experiment, and gives specific application scenarios to prove its feasibility and practicality. The analysis discusses the significance that based on the quantum entanglement effect, use the voice control technology to communication, so as to realise the interconnectedness of all things, and the problems currently faced.

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Generation of continuous variable frequency comb entanglement based on nondegenerate optical parametric amplifier

Liu¹,

Ma²,

Su³

et al. 2020

Acta Phys. Sin.

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Continuous variable (CV) quantum squeezed state and entangled state are important quantum resources, which have been widely used in quantum communication, quantum metrology and quantum computation. In recent years, people have paid much attention to the multi-mode optical parametric amplifier (OPO) process because the multi-mode non-classical light field is able to construct the multiplexing quantum information system for improving the working efficiency and channel capacity. As a special multi-mode optical field, optical frequency comb has been used in optical frequency measurement, atomic spectroscopy and frequency-division multiplex-based communication. Especially, there are a number of notable researches where quantum frequency combs are used, which exhibit multimode-entangled photon states. The quantum frequency combs provide a promising platform for quantum information technology based on time-bin-encoded qubits. In this paper, the entanglement characteristics of frequency comb in type II nondegenerate optical parametric amplifier (NOPA) below threshold are investigated experimentally. The bipartite entanglement with frequency comb structure between idle light (<inline-formula><tex-math id="M1">\begin{document}$\hat a_{{\rm{i}}, + n\varOmega }^{{\rm{out}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M1.png"/></alternatives></inline-formula>) and signal light(<inline-formula><tex-math id="M2">\begin{document}$\hat a_{{\rm{s}}, + n\varOmega }^{{\rm{out}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M2.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M2.png"/></alternatives></inline-formula>) is generated by the NOPA whose free spectral range (<i>Ω</i>) is 1.99 GHz operated in the de-amplification state and then analyzed by dual balanced homodyne detection system (BHD) with different values of frequency <inline-formula><tex-math id="M3">\begin{document}$\omega \pm n\varOmega $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M3.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M3.png"/></alternatives></inline-formula> (<i>n </i>= 0, 1, 2). The local light of BHD with frequency <inline-formula><tex-math id="M4">\begin{document}$\omega \pm n\varOmega $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M4.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M4.png"/></alternatives></inline-formula> is generated by the fiber intensity modulator and tailored by the mode cleaner. Here, we measure the correlation noise of side and frequency combs normalized to the shot noise limit relating to the phase of local oscillator beam, and we show the correlation noise of <inline-formula><tex-math id="M5">\begin{document}$\hat a_{\rm{i}}^{{\rm{out}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M5.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M5.png"/></alternatives></inline-formula> and <inline-formula><tex-math id="M6">\begin{document}$\hat a_{\rm{s}}^{{\rm{out}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M6.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M6.png"/></alternatives></inline-formula>, the correlation noise of <inline-formula><tex-math id="M7">\begin{document}$\hat a_{{\rm{i}}, + \varOmega }^{{\rm{out}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M7.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M7.png"/></alternatives></inline-formula> and <inline-formula><tex-math id="M8">\begin{document}$\hat a_{{\rm{s}}, - \varOmega }^{{\rm{out}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M8.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M8.png"/></alternatives></inline-formula>, the correlation noise of <inline-formula><tex-math id="M9">\begin{document}$\hat a_{{\rm{i}}, - \varOmega }^{{\rm{out}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M9.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M9.png"/></alternatives></inline-formula> and <inline-formula><tex-math id="M10">\begin{document}$\hat a_{{\rm{s}}, + \varOmega }^{{\rm{out}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M10.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M10.png"/></alternatives></inline-formula>, the correlation noise of <inline-formula><tex-math id="M11">\begin{document}$\hat a_{{\rm{i}}, + 2\varOmega }^{{\rm{out}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M11.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M11.png"/></alternatives></inline-formula> and <inline-formula><tex-math id="M12">\begin{document}$\hat a_{{\rm{s}}, - 2\varOmega }^{{\rm{out}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M12.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M12.png"/></alternatives></inline-formula> and the correlation noise of <inline-formula><tex-math id="M13">\begin{document}$\hat a_{{\rm{i}}, - 2\varOmega }^{{\rm{out}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M13.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M13.png"/></alternatives></inline-formula> and <inline-formula><tex-math id="M14">\begin{document}$\hat a_{{\rm{s}}, + 2\varOmega }^{{\rm{out}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M14.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="12-20200107_M14.png"/></alternatives></inline-formula>. The experimental results show that the five pairs of entangled states with 4.5 dB entanglement are simultaneously produced by a type II OPO. Next, we can redesign NOPA to reduce its free spectral range and intracavity loss, and prepare local light with a high-order sideband frequency by fiber modulators with high bandwidth, it promises to obtain huge multiple bipartite entangled states. As a kind of extensible quantum information system, the frequency comb CV entanglement can be used to provide a necessary light source for realizing the experiment of frequency division multiplexing multi-channel teleportation, which lays a foundation for the future large-capacity quantum communication and network.

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Enhancement of continuous-variable hyperentanglement by optimizing pump mode

Cited by 3 publications

References 29 publications

Molecular dynamics simulation of thermal properties of modified graphene / n-octadecane composite phase change material

Molecular dynamics simulation of thermal properties of modified graphene / n-octadecane composite phase change material

Quantum Network Communication Based on Voice-Control Technology

Generation of continuous variable frequency comb entanglement based on nondegenerate optical parametric amplifier

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