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学者姓名：江云坤
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Abstract ：
In this paper, we propose an optomechanical scheme for generating mechanical squeezing over the 3 dB limit, with the mechanical mirror being driven by a strong and linear harmonic force. In contrast to parametric mechanical driving, the linearly driven force shakes the mechanical mirror periodically oscillating at twice the mechanical eigenfrequency with large amplitude, where the mechanical mirror can be dissipatively stabilized by the engineered cavity reservoir to a dynamical squeezed steady state with a maximum degree of squeezing over 8 dB. The mechanical squeezing of more than 3 dB can be achieved even for a mechanical thermal temperature larger than 100 mK. The scheme can be implemented in a cascaded optomechanical setup, with potential applications in engineering continuous variable entanglement and quantum sensing.
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| GB/T 7714 | Lin, Xin-yu , Ye, Guang-zheng , Liu, Ye et al. Optomechanical squeezing with strong harmonic mechanical driving [J]. | OPTICS EXPRESS , 2024 , 32 (6) . |
| MLA | Lin, Xin-yu et al. "Optomechanical squeezing with strong harmonic mechanical driving" . | OPTICS EXPRESS 32 . 6 (2024) . |
| APA | Lin, Xin-yu , Ye, Guang-zheng , Liu, Ye , Jiang, Yun-kun , Wu, Huaizhi . Optomechanical squeezing with strong harmonic mechanical driving . | OPTICS EXPRESS , 2024 , 32 (6) . |
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In this paper, we study static bistability and mechanical cooling of a dissipative optomechanical cavity filled with a Kerr medium. The system exhibits optical bistability for a wide input-power range with the power threshold being greatly reduced, in contrast to the case of purely dissipative coupling. At the bistable regime, the membrane can be effectively cooled down to a few millikelvin from the room temperature under the unresolved sideband condition, where the effective mechanical temperature is a nonmonotonic function of intracavity intensity and reaches its minimum near the turning point of the upper stable branch. When the system is in the cryogenics environment, the effective mechanical temperature at the bistable regime shows a similar feature as in the room temperature case, but the optimal cooling appears at the monostable regime and approaches the mechanical ground state. Our results are of interest for further understanding bistable optomechanical systems, which have many applications in nonclassical state preparations and quantum information processing.
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| GB/T 7714 | Liu, Ye , Liu, Yang , Hu, Chang-Sheng et al. Mechanical cooling in the bistable regime of a dissipative optomechanical cavity with a Kerr medium [J]. | PHYSICAL REVIEW A , 2023 , 108 (2) . |
| MLA | Liu, Ye et al. "Mechanical cooling in the bistable regime of a dissipative optomechanical cavity with a Kerr medium" . | PHYSICAL REVIEW A 108 . 2 (2023) . |
| APA | Liu, Ye , Liu, Yang , Hu, Chang-Sheng , Jiang, Yun-Kun , Wu, Huaizhi , Li, Yong . Mechanical cooling in the bistable regime of a dissipative optomechanical cavity with a Kerr medium . | PHYSICAL REVIEW A , 2023 , 108 (2) . |
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Abstract ：
当冷空气流过一个通电的发热线圈时,线圈的温度会降低,其最终的温度取决于空气流速.对一个钨线圈通以恒定电流,将其置于风场中,用台式万用表测量线圈两端电压而得到其电阻,再利用电阻-温度特性测得线圈温度,以此达到测量风速的 目的.本文将详细探究这一物理过程,从实验进行验证,最终得到一种可靠的测量风速的方法.研究表明:该方法具有较高的测量精度和较短的响应时间,对流场干扰小.
Keyword ：
强制对流 强制对流 恒流法 恒流法 热传导 热传导 电流热效应 电流热效应 电阻温度特性 电阻温度特性
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| GB/T 7714 | 林品臻 , 江云坤 , 冯柏赫 et al. 一种利用通电线圈测量风速的方法 [J]. | 物理与工程 , 2023 , 33 (6) : 85-89 . |
| MLA | 林品臻 et al. "一种利用通电线圈测量风速的方法" . | 物理与工程 33 . 6 (2023) : 85-89 . |
| APA | 林品臻 , 江云坤 , 冯柏赫 , 黄碧华 . 一种利用通电线圈测量风速的方法 . | 物理与工程 , 2023 , 33 (6) , 85-89 . |
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We study reservoir-engineered entanglement for a cascaded bosonic system consisting of three modes, where the adjacent pairs couple to each other via both the beam-splitter interaction and the coherent parametric interaction with the interaction strengths being tunable. We focus on an optomechanical realization of the model by combining a nondegenerate parametric amplifier and an auxiliary cavity. A great steady-state cavity-mechanical entanglement can be achieved by optimizing the ratio of the interaction strengths, where the optomechanical cavity enacts the cold reservoir, simultaneously laser cooling the pair of hybrid modes delocalized over the auxiliary cavity and the mechanical oscillator. In comparison with the case of cooling a single delocalized mode, the dual-mode cooling approach allows one to obtain a greater amount of entanglement with higher cooling efficiencies and to explore strong entanglement in much broader parameter regions, where the rotating-wave approximation fails for the single-mode cooling case. Moreover, we show that the steady-state cavity-mechanical entanglement is robust to the mechanical thermal noise of the high temperature. The improved reservoir engineering approach can potentially be generalized to other bosonic systems with asymmetric beam-splitter and parametric interactions.
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| GB/T 7714 | Liu, Zhi-Qiang , Hu, Chang-Sheng , Jiang, Yun-Kun et al. Engineering optomechanical entanglement via dual-mode cooling with a single reservoir [J]. | PHYSICAL REVIEW A , 2021 , 103 (2) . |
| MLA | Liu, Zhi-Qiang et al. "Engineering optomechanical entanglement via dual-mode cooling with a single reservoir" . | PHYSICAL REVIEW A 103 . 2 (2021) . |
| APA | Liu, Zhi-Qiang , Hu, Chang-Sheng , Jiang, Yun-Kun , Su, Wan-Jun , Wu, Huaizhi , Li, Yong et al. Engineering optomechanical entanglement via dual-mode cooling with a single reservoir . | PHYSICAL REVIEW A , 2021 , 103 (2) . |
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We report an efficient mechanism to generate mechanical entanglement in a two-cascaded cavity optomechanical system with optical parametric amplifiers (OPAs) inside the two coupled cavities. We use the especially tuned OPAs to squeeze the hybrid mode composed of two mechanical modes, leading to strong macroscopic entanglement between the two movable mirrors. The squeezing parameter as well as the effective mechanical damping are both modulated by the OPA gains. The optimal degree of mechanical entanglement therefore depends on the balanced process between coherent hybrid mode squeezing and dissipation engineering. The mechanical entanglement is robust to strong cavity decay, going beyond simply resolved sideband regime, and is resistant to reasonable high thermal noise. The scheme provides an alternative way for generating strong macroscopic entanglement in cascaded optomechanical systems. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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| GB/T 7714 | Hu, Chang-Sheng , Lin, Xin-Yu , Shen, Li-Tuo et al. Improving macroscopic entanglement with nonlocal mechanical squeezing [J]. | OPTICS EXPRESS , 2020 , 28 (2) : 1492-1506 . |
| MLA | Hu, Chang-Sheng et al. "Improving macroscopic entanglement with nonlocal mechanical squeezing" . | OPTICS EXPRESS 28 . 2 (2020) : 1492-1506 . |
| APA | Hu, Chang-Sheng , Lin, Xin-Yu , Shen, Li-Tuo , Su, Wan-Jun , Jiang, Yun-Kun , Wu, Huaizhi et al. Improving macroscopic entanglement with nonlocal mechanical squeezing . | OPTICS EXPRESS , 2020 , 28 (2) , 1492-1506 . |
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We observed optical precursors in four-wave mixing based on a cold-atom gas. Optical precursors appear at the edges of pulses of the generated optical field, and propagate through the atomic medium without absorption. Theoretical analysis suggests that these precursors correspond to high-frequency components of the signal pulse, which means the atoms cannot respond quickly to rapid changes in the electromagnetic field. In contrast, the low-frequency signal components are absorbed by the atoms during transmission. We also showed experimentally that the backward precursor can be stored using a Raman transition of the atomic ensemble and retrieved later.
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| GB/T 7714 | Ding, Dong-Sheng , Jiang, Yun Kun , Zhang, Wei et al. Optical Precursor with Four-Wave Mixing and Storage Based on a Cold-Atom Ensemble [J]. | PHYSICAL REVIEW LETTERS , 2015 , 114 (9) . |
| MLA | Ding, Dong-Sheng et al. "Optical Precursor with Four-Wave Mixing and Storage Based on a Cold-Atom Ensemble" . | PHYSICAL REVIEW LETTERS 114 . 9 (2015) . |
| APA | Ding, Dong-Sheng , Jiang, Yun Kun , Zhang, Wei , Zhou, Zhi-Yuan , Shi, Bao-Sen , Guo, Guang-Can . Optical Precursor with Four-Wave Mixing and Storage Based on a Cold-Atom Ensemble . | PHYSICAL REVIEW LETTERS , 2015 , 114 (9) . |
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Constructing a quantum memory for a photonic entanglement is vital for realizing quantum communication and network. Because of the inherent infinite dimension of orbital angular momentum (OAM), the photon's OAM has the potential for encoding a photon in a high-dimensional space, enabling the realization of high channel capacity communication. Photons entangled in orthogonal polarizations or optical paths had been stored in a different system, but there have been no reports on the storage of a photon pair entangled in OAM space. Here, we report the first experimental realization of storing an entangled OAM state through the Raman protocol in a cold atomic ensemble. We reconstruct the density matrix of an OAM entangled state with a fidelity of 90.3% +/- 0.8% and obtain the Clauser-Horne-Shimony-Holt inequality parameter S of 2.41 +/- 0.06 after a programed storage time. All results clearly show the preservation of entanglement during the storage.
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| GB/T 7714 | Ding, Dong-Sheng , Zhang, Wei , Zhou, Zhi-Yuan et al. Quantum Storage of Orbital Angular Momentum Entanglement in an Atomic Ensemble [J]. | PHYSICAL REVIEW LETTERS , 2015 , 114 (5) . |
| MLA | Ding, Dong-Sheng et al. "Quantum Storage of Orbital Angular Momentum Entanglement in an Atomic Ensemble" . | PHYSICAL REVIEW LETTERS 114 . 5 (2015) . |
| APA | Ding, Dong-Sheng , Zhang, Wei , Zhou, Zhi-Yuan , Shi, Shuai , Xiang, Guo-Yong , Wang, Xi-Shi et al. Quantum Storage of Orbital Angular Momentum Entanglement in an Atomic Ensemble . | PHYSICAL REVIEW LETTERS , 2015 , 114 (5) . |
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Light beams with extraordinary spatial structures, such as the Airy beam (AB), the Bessel-Gaussian beam (BGB) and the Laguerre-Gaussian beam (LGB), are widely studied and applied in many optical scenarios. We report on preparation of light beams with controllable spatial structures through sum frequency generation (SFG) using two Gaussian pump beams in a quasi-phase matching (QPM) crystal. The spatial structures, including multi-ring-like BGB, donut-like LGB, and super-Gaussian-like beams, can be controlled periodically via crystal phase mismatching by tuning the pump frequency or crystal temperature. This phenomenon has not been reported or discussed previously. Additionally, we present numerical simulations of the phenomenon, which agree very well with the experimental observations. Our findings give further insight into the SFG process in QPM crystals, provide a new way to generate light with unusual spatial structures, and may find applications in the fields of laser optics, all-optical switching, and optical manipulation and trapping.
Keyword ：
NONLINEAR OPTICS NONLINEAR OPTICS OPTICAL MANIPULATION AND TWEEZERS OPTICAL MANIPULATION AND TWEEZERS
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| GB/T 7714 | Zhou, Zhi-Yuan , Li, Yan , Ding, Dong-Sheng et al. Generation of light with controllable spatial patterns via the sum frequency in quasi-phase matching crystals [J]. | SCIENTIFIC REPORTS , 2014 , 4 . |
| MLA | Zhou, Zhi-Yuan et al. "Generation of light with controllable spatial patterns via the sum frequency in quasi-phase matching crystals" . | SCIENTIFIC REPORTS 4 (2014) . |
| APA | Zhou, Zhi-Yuan , Li, Yan , Ding, Dong-Sheng , Jiang, Yun-Kun , Zhang, Wei , Shi, Shuai et al. Generation of light with controllable spatial patterns via the sum frequency in quasi-phase matching crystals . | SCIENTIFIC REPORTS , 2014 , 4 . |
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Quantum memories have been realized in different physical systems, such as atomic ensembles or solid systems. To date, all quantum memories have realized the storage and retrieval of photons encoded using only a two-dimensional space spanned, for example, by the orthogonal polarization states, and hence can only store a quantum bit. Using electromagnetically induced transparency in a cold atomic ensemble, we report the experimental realization of a quantum memory storing a photon encoded in a three-dimensional space spanned by orbital angular momentum (OAM) states. We experimentally reconstruct the storage process density matrix with a fidelity of 85.3% +/- 1.8% using a 4-f imaging system. We also realize storage of two special photonic qutrit states as examples. Toward storing a higher-dimensional state encoded in OAM space, the efficiency difference between different OAM states should be considered according to the experimental results. The capability to store high-dimensional quantum states with high fidelity is a key step towards building high-dimensional quantum networks.
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| GB/T 7714 | Ding, Dong-Sheng , Zhang, Wei , Zhou, Zhi-Yuan et al. Toward high-dimensional-state quantum memory in a cold atomic ensemble [J]. | PHYSICAL REVIEW A , 2014 , 90 (4) . |
| MLA | Ding, Dong-Sheng et al. "Toward high-dimensional-state quantum memory in a cold atomic ensemble" . | PHYSICAL REVIEW A 90 . 4 (2014) . |
| APA | Ding, Dong-Sheng , Zhang, Wei , Zhou, Zhi-Yuan , Shi, Shuai , Pan, Jian-song , Xiang, Guo-Yong et al. Toward high-dimensional-state quantum memory in a cold atomic ensemble . | PHYSICAL REVIEW A , 2014 , 90 (4) . |
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Here, we show indirect precise angular control using a four-wave mixing (FWM) process. This was performed with a superposition of light with orbital angular momentum in an M-Type configuration of a hot Rb-85 atomic ensemble. A gear-shaped interference pattern is observed at FWM light with a donut-shaped input signal. The gear could be rotated and is controlled through the change of the polarization of the pump laser. Our experimental results that are based on nonlinear coherent interactions have applications in image processing and precise angular control. (C) 2014 AIP Publishing LLC.
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| GB/T 7714 | Zhang, Wei , Ding, Dong-Sheng , Jiang, Yun-Kun et al. Indirect precise angular control using four-wave mixing [J]. | APPLIED PHYSICS LETTERS , 2014 , 104 (17) . |
| MLA | Zhang, Wei et al. "Indirect precise angular control using four-wave mixing" . | APPLIED PHYSICS LETTERS 104 . 17 (2014) . |
| APA | Zhang, Wei , Ding, Dong-Sheng , Jiang, Yun-Kun , Shi, Bao-Sen , Guo, Guang-Can . Indirect precise angular control using four-wave mixing . | APPLIED PHYSICS LETTERS , 2014 , 104 (17) . |
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