Article
Physics, Multidisciplinary
Mohammad Ehsan Farzan, Mohammad Javad Faghihi, Gholamreza Honarasa
Summary: The paper introduces f-deformed photon-added squeezed Kerr states by applying the f-deformed creation operator to the squeezed Kerr states, showing that various types of nonclassical states can be generated by adjusting controlling parameters. The numerical study of nonclassical properties including photon statistics, squeezing, and Husimi Q distribution function reveals that adding photons enhances the nonclassical behavior of the states, with the operator-valued intensity-dependent function playing a crucial role in unveiling the nonclassical aspects of the system.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2021)
Article
Optics
Song Yang, Shengli Zhang
Summary: In this work, we investigate the loophole-free Bell inequality test using a multi-photon subtracted two-mode squeezed state (TMSS). By applying ideal bi-side five-photon subtractions, we achieve a violation of the Bell inequality that approaches Munro's optimal bound. Additionally, we develop a concise phase-space method for deriving the violation of the loophole-free Bell inequality, providing physically implementable states for experimental realization.
Article
Physics, Multidisciplinary
Wei Ye, Ying Guo, Huan Zhang, Ying Xia, Yun Mao
Summary: The study shows that performing high-order GSP operations on the STS benefits the existence of photon-antibunching effect, sub-Poissonian distribution, and partial negativity of the WF at low squeezing levels. The PSTA-STS outperforms other non-Gaussian resources in terms of sub-Poissonian distribution and partial negativity of the WF.
Article
Multidisciplinary Sciences
Sang-il Park, Changsuk Noh, Changhyoup Lee
Summary: This paper investigates the quantum advantages in loss sensing using the two-mode squeezed vacuum state as a probe. By computing the signal-to-noise ratio, it is shown that quantum advantages persist even under strong thermal background noise. Furthermore, an optimum measurement scheme is proposed to demonstrate quantum advantages over the entire range of environmental noise and loss.
SCIENTIFIC REPORTS
(2023)
Article
Optics
Zhiwei Tao, Yichong Ren, Azezigul Abdukirim, Shiwei Liu, Ruizhong Rao
Summary: The phase-dependent error distribution of locally unentangled quantum states directly affects the accuracy of quantum parameter estimation. Using the displaced squeezed vacuum (DSV) state can approach the ultimate quantum limit in parameter estimation accuracy within certain ranges of phase-sensitive parameters, while optimal estimation accuracy can only be achieved when the DSV state degenerates to a squeezed vacuum state within other ranges.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Physics, Multidisciplinary
Dmitry A. Kuts, Mikhail S. Podoshvedov, Ba An Nguyen, Sergey A. Podoshvedov
Summary: We propose an efficient method to generate optical analogs of even and odd Schrodinger cat states with large amplitude, high fidelity, and reasonable generation rate.
Article
Multidisciplinary Sciences
Ruotian Gong, Guanghui He, Xingyu Gao, Peng Ju, Zhongyuan Liu, Bingtian Ye, Erik A. Henriksen, Tongcang Li, Chong Zu
Summary: In this study, we investigated the coherent dynamics of strongly interacting ensembles of negatively charged boron vacancy (V-B(-)) centers in hexagonal boron nitride (hBN). By selectively isolating different dephasing sources, we observed significant improvement in the measured coherence times and estimated the concentration of V-B(-). Additionally, we studied the spin response of V-B(-) to local charged defects induced electric field signals.
NATURE COMMUNICATIONS
(2023)
Review
Physics, Multidisciplinary
R. Zakharov, O. Tikhonova
Summary: This article discusses the spatial and spectral properties of electromagnetic fields in a squeezed vacuum state and considers photon correlations in such fields. It presents a theoretical approach for accurately describing any characteristics of the squeezed field, including photon correlations. It also introduces methods for controlling the mode content, degree of squeezing, and entanglement of photons, and analyzes their advantages and applied prospects.
Article
Chemistry, Multidisciplinary
Chen Zhou, Matthew R. Hermes, Dihua Wu, Jie J. Bao, Riddhish Pandharkar, Daniel S. King, Dayou Zhang, Thais R. Scott, Aleksandr O. Lykin, Laura Gagliardi, Donald G. Truhlar
Summary: This article provides an introduction to strongly correlated systems and multiconfiguration pair-density functional theory (MC-PDFT) which is used to quantitatively treat near-degeneracy correlation and dynamic correlation in these systems. The article also discusses recent developments and applications of MC-PDFT and related methods.
Article
Chemistry, Physical
Felipe Herrera, Marina Litinskaya
Summary: We propose the use of molecular picocavity ensembles as macroscopic coherent nonlinear optical devices enabled by nanoscale strong coupling. We show that strong coupling of the picocavity vacua with a specific vibronic sideband in the molecular emission spectrum can significantly change the effective refractive index of the metamaterial, allowing cross-phase modulation of optical fields. Our work paves the way for the development of plasmonic metamaterials that exploit strong coupling for optical state preparation and quantum control.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Optics
Sergey A. Podoshvedov, Mikhail S. Podoshvedov
Summary: A new method for generating entangled states, both hybrid and consisting exclusively of continuous variable (CV) states, is proposed. The entanglement synthesis can be expanded to implement a high-complexity quantum network.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Meiyu Wang, Yuhong Zheng, Liangxue Fu, Fengli Yan, Ting Gao
Summary: A technique for remotely preparing an arbitrary single-photon hybrid state between two distant nodes using hyper-entangled state in polarization and time-bin degrees of freedom is presented. The sender performs unitary operations on her photon and target state is reconstructed at the remote receiver's quantum system through single-photon projective measurement and classical communication. The study discusses remote state preparation via partially hyper-entangled state and aims to pave the way towards long-distance quantum communication scenarios.
RESULTS IN PHYSICS
(2021)
Article
Physics, Multidisciplinary
Kun Jiang, L. F. Wei
Summary: Beam-splitting photon number resolved (PNR) detection can generate antibunching light by subtracting odd photons from superbunching squeezed vacuum light. This technique can be used for engineering various nonclassical light by performing PNR measurements on squeezed vacuum light. The key is to use beam-splitting PNR detection to subtract odd photons and achieve the desired photon distribution.
Article
Physics, Multidisciplinary
Guan-Hua Zuo, Yu-Chi Zhang, Gang Li, Peng-Fei Zhang, Peng-Fei Yang, Yan-Qiang Guo, Shi-Yao Zhu, Tian-Cai Zhang
Summary: In this study, we experimentally generate quadrature squeezing resonating on the cesium D-2 line down to 10 Hz for the first time. The maximum squeezing in the audio frequency band is 5.57 dB. Furthermore, we propose a single-photon modulation locking technique to control the squeezing angle and effectively suppress the influence of laser noise on low-frequency squeezing. The generated low-frequency squeezed light source can be utilized in quantum metrology, light-matter interaction investigation, and quantum memory in the audio frequency band and even below.
FRONTIERS OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Guanhua Zuo, Yuchi Zhang, Jing Li, Shiyao Zhu, Yanqiang Guo, Tiancai Zhang
Summary: This study provides an alternative method based on photon statistics measurement to determine the weak squeezing of light generated from an optical parametric oscillator (OPO) working below the threshold. The method allows for high-precision measurement of weak squeezing, independent of the detection efficiency.
Article
Physics, Multidisciplinary
Hong Chang, Xin Yang, Jinwen Wang, Yan Ma, Xinqi Yang, Mingtao Cao, Xiaofei Zhang, Hong Gao, Ruifang Dong, Shougang Zhang
Summary: We propose and demonstrate an atomic spatial mode extracting scheme for vector beams based on polarization-dependent absorption in atom vapor. By employing a linear polarization pump beam, a counter-propagated weak probe vector beam is extracted by spatial absorption. The extracted part still maintains the original polarization and vortex phase. Our work can be potentially applied in non-destructive spatial mode identification and for studying higher-dimensional quantum information.
Article
Instruments & Instrumentation
Qi Zang, Xue Deng, Xiang Zhang, Dan Wang, Qian Zhou, Dongdong Jiao, Guanjun Xu, Jing Gao, Jie Liu, Tao Liu, Ruifang Dong, Shougang Zhang
Summary: In this paper, a cascaded transfer of optical frequency with a relay station over a fiber link is demonstrated. The relay station compensates for power loss with a two-stage EDFA and seeds the amplified signal into the next fiber link. The system achieves low-noise optical amplification with 50 dB gain and long-term stability, enabling the transfer of laser frequency with high accuracy.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Optics
Long Chen, Xuwen Hu, Liang Han, Guanjun Xu, Lei Liu, Yang Li, Tao Liu, Ruifang Dong, Shougang Zhang
Summary: The increasing performance of ultra-stable lasers has made them attractive for non-laboratory and space field applications. How to reduce the vibration sensitivity of the optical reference cavity is one of the key points. To develop vibration-insensitive cavity for space applications, we investigate the vibration sensitivity of a cubic cavity with the length of 100 mm theoretically and experimentally.
OPTICS AND LASER TECHNOLOGY
(2023)
Review
Optics
Xiang Zhang, Liang Hu, Xue Deng, Qi Zang, Dongdong Jiao, Jing Gao, Dan Wang, Qian Zhou, Jie Liu, Guanjun Xu, Tao Liu, Ruifang Dong, Shougang Zhang
Summary: Optical fibers are seen as a promising material for coherent optical frequency transfer. Passive phase noise cancellation technique can be preferable for noisy fiber links. With the introduction of a fiber-pigtailed acousto-optic modulator (AOM), coherent light was successfully transferred through a 260 km noisy urban fiber link.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Instruments & Instrumentation
Dongdong Jiao, Xue Deng, Jing Gao, Linbo Zhang, Guanjun Xu, Tao Liu, Ruifang Dong, Shougang Zhang
Summary: We have developed a compact ultra-stable laser at 1550 nm with a narrow line-width of 0.57 Hz, utilizing a 50-mm cubic optical cavity. By optimizing the physical structure based on a careful investigation of the cavity's vibration behavior in three directions, we greatly improved its insensitivity to vibration and increased the first-order resonance frequency by nearly twice compared to the previous setup. In a long-distance highway transport test over 1700 km, the laser showed almost unchanged performance, indicating its excellent anti-vibration capability. The fractional frequency instability reached approximately 2.6 x 10-15 at 1-10 s, close to the thermal noise floor, making it suitable for high-precision applications. This study represents the longest-distance transport vibration test for a practical transportable laser to date and the design strategy can be valuable for space-borne laser applications.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Optics
Baihong Li, Boxin Yuan, Changhua Chen, Xiao Xiang, Runai Quan, Ruifang Dong, Shougang Zhang, Rui-Bo Jin
Summary: A modified Hong-Ou-Mandel (HOM) interference experiment shows that the two-photon interference phenomenon can only be explained by the concept of a two-photon wave packet, rather than a single photon. However, the temporal interferogram in the modified HOM interferometer sometimes becomes flat, providing no useful information from time-domain measurements. We theoretically explore this temporal interferogram from the frequency domain and obtain spectrally resolved interference with high visibility. This modulation of the joint spectral intensity holds potential for the generation and characterization of high-dimensional frequency entanglement.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Dongdong Jiao, Jing Gao, Linbo Zhang, Xue Deng, Qi Zang, Guanjun Xu, Ruifang Dong, Tao Liu, Shougang Zhang
Summary: In this paper, we present a rigidly mounted and vibration insensitive multi-channel spherical optical reference cavity. The structure is based on sphere geometry with four symmetrically arranged supports. We calculate the vibration sensitivities theoretically and measure them experimentally. The observed vibration sensitivities are in accordance with the theory, and the spherical optical reference cavity has a smaller mass compared to a cubic optical reference cavity.
OPTICS COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Jens A. H. Nielsen, Jonas S. Neergaard-Nielsen, Tobias Gehring, Ulrik L. Andersen
Summary: The modern scientific method relies on precise measurements of physical parameters. The measurement of optical phase, for example, is conventionally limited by the Heisenberg limit. However, deterministic phase estimation with N00N states has not yet reached or surpassed this limit. In this study, we use a scheme based on Gaussian squeezed vacuum states and high-efficiency homodyne detection to achieve phase estimates with extreme sensitivity that surpasses the shot noise limit and even the conventional Heisenberg limit.
PHYSICAL REVIEW LETTERS
(2023)
Article
Pharmacology & Pharmacy
Kai-Di Wang, Miao-Lin Zhu, Cheng-Jiao Qin, Rui-Fang Dong, Cheng-Mei Xiao, Qing Lin, Rong-Yuan Wei, Xiao-Yu He, Xin Zang, Ling-Yi Kong, Yuan-Zheng Xia
Summary: This study revealed the anticancer mechanism of SNG in osteosarcoma, uncovering the potential apoptotic role of SSBP1 in osteosarcoma cells. This finding holds significant promise in advancing the development of novel anticancer drugs and identification of therapeutic targets.
BRITISH JOURNAL OF PHARMACOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Jianguo Shen, Ziang Qiu, Ruimin Xue, Liang Hu, Jiao Liu, Guiling Wu, Xiang Zhang, Xue Deng, Ruifang Dong, Tao Liu, Shougang Zhang, Jianping Chen
Summary: We present a multiple-branch optical frequency transfer method for delivering an optical reference to multiple independent remote sites. By adding a short loop fiber link at the local site, this technique mitigates the frequency allocation constraints of the acousto-optic modulators (AOMs) at the remote sites. It simplifies the configuration at the local site, improves the signal-to-noise ratio (SNR), and reduces the cycle slip rate.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Baihong Li, Changhua Chen, Xiao Xiang, Runai Quan, Ruifang Dong, Shougang Zhang, Xiangying Hao, Rui-Bo Jin
Summary: We propose a theoretical quantum interferometer that combines the NOON state interferometer with the Hong-Ou-Mandel interferometer. This interferometer can show temporal interference patterns related to biphoton frequency sum and difference in different parts of a single interferogram. By taking a Fourier transform, it is possible to obtain spectral correlation information of biphotons in both frequency sum and difference simultaneously, providing a method for complete spectral characterization of arbitrary two-photon states. This interferometer also has potential applications in quantum Fourier-transform spectroscopy and quantum metrology.
Article
Optics
Anders J. E. Bjerrum, Jonatan B. Brask, Jonas S. Neergaard-Nielsen, Ulrik L. Andersen
Summary: In this paper, an all-optical setup is analyzed, which achieves Bell-inequality violation over long distances by using probabilistic entanglement swapping. The setup consists of two-mode squeezers, displacements, beamsplitters, and on-off detectors. The arrangement of events to close both the detection and locality loopholes is described. A scenario with dichotomic inputs and outputs is analyzed, and the robustness of Bell inequality violation is checked for up to six parties, considering phase, amplitude, dark count noise, and loss.
Article
Optics
Anders J. E. Bjerrum, Jonatan B. Brask, Jonas S. Neergaard-Nielsen, Ulrik L. Andersen
Summary: This study investigates the storage and purification of a photon-loss-affected two-mode squeezed vacuum state using noiseless amplification with solid-state qubits. The proposed method increases entanglement between the parties sharing the state probabilistically. The amplification step involves transferring the state from an optical mode to a set of solid-state qubits acting as a quantum memory, similar to a set of quantum scissors.
Article
Optics
Frederik Werner Isaksen, Ulrik Lund Andersen
Summary: A mechanical system can be optimally controlled through continuous measurements of its position followed by feedback. Using the complete formalism, without invoking the standard rotating-wave approximation and the adiabatic approximation, we deduce the conditional and unconditional states of a mechanical oscillator that lead to mechanical cooling and mechanical squeezing. The exact solutions significantly differ from the approximate solutions, highlighting the importance of using the complete model. Additionally, we demonstrate that the conditional and unconditional states cannot coincide in a typical control scheme, even with infinite feedback strength.
Article
Engineering, Electrical & Electronic
Ruifang Dong, Xiaoxia Le, Meixiang Quan, Jiangming Kan
Summary: This research proposes a robust initialization method for filtering-based Visual-inertial systems (VINS) to improve the initialization quality by aligning the relative pose estimated by vision with preintegration inertial measurement unit (IMU). Additionally, the gravity vector is added into the state vector for online optimization, and the performances of different gravity vector parameterizations are compared.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
