Abstract:Recently, there is a tremendous attention on the high-dimensional quantum information processing using the orbital angular momentum(OAM) of photons. It provides an efficient method to increase the capacity of quantum channel. However, OAM is very vulnerable to atmospheric turbulence, resulting in phase distortion and therefore, leading to information leakage during quantum communications. On the other hand, quantum secure direct communications (QSDC) defines an efficient way of information exchange through quantum channels directly. Here in this work, by combining the applications of OAM states of photons as the information carrier with the QSDC, this paper analyzed the performance of the high-dimensional quantum secure direct communication protocol based on encoding the information on the single photon OAM state under the condition of free space channel. Numerically, this paper discussed the performance of OAM states QSDC under atmospheric turbulence, and mainly calculates the influence of cross-talk caused by phase fluctuation on the system. This paper has drawn the conclusion that in weak turbulence, when the beam waist w\' and the Fried parameter r become comparable, the information capacity will decrease sharply.

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	1. The Analysis of Efficiency for High-dimensional Quantum Secure Direct Communication Under Atmospheric Turbulence
	NIU Jialei,WANG Tiejun,LIU Xinchang
	Physics 02 April 2022
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (579K B)

	Abstract:Recently, there is a tremendous attention on the high-dimensional quantum information processing using the orbital angular momentum(OAM) of photons. It provides an efficient method to increase the capacity of quantum channel. However, OAM is very vulnerable to atmospheric turbulence, resulting in phase distortion and therefore, leading to information leakage during quantum communications. On the other hand, quantum secure direct communications (QSDC) defines an efficient way of information exchange through quantum channels directly. Here in this work, by combining the applications of OAM states of photons as the information carrier with the QSDC, this paper analyzed the performance of the high-dimensional quantum secure direct communication protocol based on encoding the information on the single photon OAM state under the condition of free space channel. Numerically, this paper discussed the performance of OAM states QSDC under atmospheric turbulence, and mainly calculates the influence of cross-talk caused by phase fluctuation on the system. This paper has drawn the conclusion that in weak turbulence, when the beam waist w\' and the Fried parameter r become comparable, the information capacity will decrease sharply.
	TO cite this article:NIU Jialei,WANG Tiejun,LIU Xinchang. The Analysis of Efficiency for High-dimensional Quantum Secure Direct Communication Under Atmospheric Turbulence[OL].[ 2 April 2022] http://en.paper.edu.cn/en_releasepaper/content/4757317


	2. Quantum entanglement between two antiferromagnets in the microcavities
	YANG Xiaoxiao,WANG Tiejun,WANG Chuan
	Physics 02 April 2022
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (743K B)

	Abstract:Magnons are being currently developed as qubits for quantum storage and information processing. Here, in this work, we focus on a hybrid quantum system containing two antiferromagnets, and entanglement between magnons in the antiferromagnets can be generated through strong coupling mediated by the same microwave mode. Moreover, we numerically simulate the process with feasible parameters. The influence of the system parameters, such as the magnon-photon coupling rate, detuning, bias magnetic field and dissipation of entanglement, are discussed. By adjusting some of the experimental parameters, we show that two antiferromagnets can produce a large entanglement, which is a result that has not been previously found in other quantum systems. Our findings may provide a potential platform for the completion of related quantum tasks in the future.
	TO cite this article:YANG Xiaoxiao,WANG Tiejun,WANG Chuan. Quantum entanglement between two antiferromagnets in the microcavities[OL].[ 2 April 2022] http://en.paper.edu.cn/en_releasepaper/content/4757286

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	3. Comment on Quantum private query with perfect user privacy against a joint-measurement attack
	Wu Yali,Sun Hongxiang
	Physics 22 March 2021
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (473K B)

	Abstract:The quantum-key-distribution (QKD)-based quantum private query (QPQ) has become a research hotspot in recent years. Although such QPQ protocols are practical, joint-measurement (JM) attack is a noteworthy threat to the security of the database. Specifically, a malicious user can illegally obtain entries more than the average number of honest users from the database. Taking Jakobi et al.\'s protocol as an example, a malicious user can obtain up to 500 bits from a database of 10000 bits in one query instead of the expected 2.44 bits. In order to prevent JM attacks, Yang et al. proposed a novel classical post-processing against the JM attack. But after analysis, we found that there are security flaws in these protocols. It is impossible to achieve joint measurement resistance in the quantum private query agreement between the two parties only through a simple classical post-processing process.
	TO cite this article:Wu Yali,Sun Hongxiang. Comment on Quantum private query with perfect user privacy against a joint-measurement attack[OL].[22 March 2021] http://en.paper.edu.cn/en_releasepaper/content/4754002


	4. Quantum state manipulation based on nitrogen-vacancy centers in diamond
	WANG Jie-Qiong, ZHANG Yong
	Physics 12 March 2021
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (489K B)

	Abstract:A scheme for quantum state manipulation based on the nitrogen-vacancy centers is proposed in the paper. The scheme uses the properties of nuclear and electronic spins to generate the Bell states and performs quantum state manipulation through a series of quantum gates. To avoid state collapse due to the measurement, the scheme transforms the entangled state consisting of electron spin and nuclear spin to the photon entangled state and uses the parity gates for probabilistic identification. The scheme is physically feasible and may provide new perspectives for NV center-based quantum state transfer and quantum information processing.
	TO cite this article:WANG Jie-Qiong, ZHANG Yong. Quantum state manipulation based on nitrogen-vacancy centers in diamond[OL].[12 March 2021] http://en.paper.edu.cn/en_releasepaper/content/4754082


	5. Plasmon Enhanced Visible Light Photocatalytic Activity of Flower-like Au-TiO2 Core-shell Nanoparticles
	Youlong Chen,Liang Ma,Xiang-Bai Chen
	Physics 14 September 2020
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (665K B)

	Abstract:Flower-like Au-TiO2 core-shell nanoparticles (NPs) were synthesized by a facile and high-yield hydrothermal method in which gold NPs were used as cores and TiF4 was used as precursor. A series of characterizations were carried out to examine the morphology, crystallinity, and composition of the nanostructures. The Au-TiO2 core-shell NPs exhibit uniform flower-like morphology, porous TiO2 shells, and strong surface plasmon resonance (SPR) absorption band in the visible light region. Hence, compared with the hollow TiO2 NPs, the Au-TiO2 core-shell NPs exhibited greatly improved photocatalytic activity for the degradation of methylene blue under visible light irradiation. Such enhancement can be ascribed to the resonant energy transfer and direct electron transfer between TiO2 and Au parts in the core-shell nanostructures. We believe that such plasmonic photosensitizers based on this enhancement mechanism would offer much more flexibility for designing solar energy materials, photocatalysts and other optoelectronic devices.
	TO cite this article:Youlong Chen,Liang Ma,Xiang-Bai Chen. Plasmon Enhanced Visible Light Photocatalytic Activity of Flower-like Au-TiO2 Core-shell Nanoparticles[OL].[14 September 2020] http://en.paper.edu.cn/en_releasepaper/content/4752800


	6. Four state Reference-Frame-Independent Quantum Key Distribution with the heralded pair-coherent sources
	Yang Shun-Yu, Li Zheng-Hua, Wang Ji-Peng, Ma Hai-Qiang
	Physics 06 March 2020
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	Abstract:We propose a scheme of practical four state decoy state reference-frame-independent quantum key distribution(RFI-QKD) with the heralded pair-coherent sources (HPCS). Although fewer state is used in our scheme, its performance can approach original six-state protocol. Through utilizing HPCS, we can obviously improve the performance of four state RFI-QKD in both the final key rate and the secure transmission distance compared with the protocol using weak coherent sources. Moreover, when taking source flaws, intensity fluctuations and statistical fluctuations into consideration, simulation results show that our protocol can achieve high key generation rate at long distance transmission.
	TO cite this article:Yang Shun-Yu, Li Zheng-Hua, Wang Ji-Peng, et al. Four state Reference-Frame-Independent Quantum Key Distribution with the heralded pair-coherent sources[OL].[ 6 March 2020] http://en.paper.edu.cn/en_releasepaper/content/4751070


	7. Single ionization of Ne by the ultrafast XUV laser
	LEI Jianting,ZHANG Min,HAI Bang,HU Bitao,LIU Zuoye,ZHANG Shaofeng
	Physics 30 December 2019
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	Abstract:Fully differential cross sections of single ionization of Ne atom by a 36.1 eV linearly polarized XUV (attosecond extreme ultraviolet) photon has been studied using a reaction microscope. We obtain photoelectron angular distribution and β-asymmetry parameter directly. The measured angular distribution and β-asymmetry parameter are in a good agreement with the previous experimental results and the most accurate theoretical calculation.
	TO cite this article:LEI Jianting,ZHANG Min,HAI Bang, et al. Single ionization of Ne by the ultrafast XUV laser[OL].[30 December 2019] http://en.paper.edu.cn/en_releasepaper/content/4750388


	8. Laser-induced vibrational distribution of nitrogen ions in two color setup
	CHEN Rao,WANG Quanjun,WANG Xiaozhen,SUN Chunlin,DING Jingjie,HU Bitao,LIU Zuoye
	Physics 19 December 2019
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	Abstract:We report the forward radiation lasing and absorption phenomena in pure nitrogen gas produced by a collinear two-color laser setup, consisting of a 800 nm pump and 354 nm probe pulses. The spectral components of transmitted probe pulse are attributed at 353.8 nm, 354.9 nm and 356.4 nm, corresponding to transitions in the first negative band of the singly charged nitrogen molecular ion N2+. Compared with the absorption signals at 354.9 nm and 356.4 nm, the signal at 353. nm is radiational. The present study has a further understanding of population distribution in upper vibrational state.
	TO cite this article:CHEN Rao,WANG Quanjun,WANG Xiaozhen, et al. Laser-induced vibrational distribution of nitrogen ions in two color setup[OL].[19 December 2019] http://en.paper.edu.cn/en_releasepaper/content/4750184


	9. Reduced Fine Structure Constant, and A Calculation of Gravitational Radiation of Hydrogen Atom
	Yuan Xinxi
	Physics 23 June 2019
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (395K B)

	Abstract:In this paper some speculated ideas are invented by analogy between gravity and electromagnetism. Analog to the relation between the fine structure constant and the Planck constant, planck constant of gravitational interaction is defined by the rest mass of the electron and the reduced fine structure constant. Then a recommended value of planck constant of gravitational interaction is given. If the definition is true, the reduced fine structure constant may be a common constant shared by gravitational and electromagnetic interactions. Based on the planck constant of gravitational interaction, main spectrum lines of Lyman series, Balmer series, and Paschen series of gravitational radiation of atomic Hydrogen are discussed, respectively. All the above ideas originate from a simple viewpoint that gravitational masses (the gravitational charges) should be invariant under Lorentz transformations.
	TO cite this article:Yuan Xinxi. Reduced Fine Structure Constant, and A Calculation of Gravitational Radiation of Hydrogen Atom[OL].[23 June 2019] http://en.paper.edu.cn/en_releasepaper/content/4749299


	10. High intrinsic dielectric properties for aluminates
	LIU Yaoyao,LI Qiuju
	Physics 27 March 2019
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (2328K B)

	Abstract:The dielectric properties of LaAlO3, YAlO3, SrLaAlO4, and NdCaAlO4 single crystals were examined in the temperature range of -180-800℃ and the frequency range of 100 Hz-5 MHz. A thermally activated relaxation resulting from the hopping motions of oxygen vacancies was found in these aluminates. Impedance analysis revealed that LaAlO3, YAlO3, and NdCaAlO4 show intrinsic dielectric properties in the temperature range below 200℃. While for SrLaAlO4, whose intrinsic dielectric properties can be maintained up to a higher temperature of 400℃. The aluminates show close intrinsic dielectric constant of ~20 with low dielectric loss in their intrinsic range indicating that these materials are very encouraging for gate dielectrics.
	TO cite this article:LIU Yaoyao,LI Qiuju. High intrinsic dielectric properties for aluminates[OL].[27 March 2019] http://en.paper.edu.cn/en_releasepaper/content/4748042

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