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Effects of the Casimir force on the properties of a hybrid optomechanical system

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Chinese Physics B 2019年第1期28卷 379-384页

作者： Yi-Ping Wang Zhu-Cheng Zhang Ya-Fei Yu Zhi-Ming Zhang guangdong provincial key laboratory of Nanophotonic Functional materials and Devices(School of Information and Optoelectronic Science and engineering) Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum MaterialsSouth China Normal University

We investigate the effects of the Casimir force on the output properties of a hybrid optomechanical system. In this system, a nanosphere is fixed on the movable-mirror side of the standard optomechanical system, and the nanosphere interacts with the movable-mirror via the Casimir force, which depends on the mirror–sphere separation. In the presence of the probe and control fields, we analyze the transmission coefficient and the group delay of the field-component with the frequency of the probe field. We also study the transmission intensity of the field-component with the frequency of a newly generated four-wave mixing(FWM) field. By manipulating the Casimir force, we find that a tunable slow light can be realized for the field-component with the frequency of the probe field, and the intensity spectrum of the FWM field can be enhanced and shifted effectively.

关键词： quantum optics optomechanics quantum information and processing

Entanglements in a coupled cavity–array with one oscillating end-mirror

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Chinese Physics B 2015年第10期24卷 227-233页

作者：吴琴肖银张智明 guangdong provincial key laboratory of Nanophotonic Functional materials and Devices(SIPSE) Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum MaterialsSouth China Normal University School of Information engineering Guangdong Medical University

We theoretically investigate the entanglement properties in a hybrid system consisting of an optical cavity-array coupled to a mechanical resonator. We show that the steady state of the system presents bipartite continuous variable entanglement in an experimentally accessible parameter regime. The effects of the cavity-cavity coupling strength on the bipartite entanglements in the field-mirror subsystem and in the field-field subsystem are studied. We further find that the entanglement between the adjacent cavity and the movable mirror can be entirely transferred to the distant cavity and mirror by properly choosing the cavity detunings and the coupling strength in the two-cavity case. Surprisingly, such a remote macroscopic entanglement tends to be stable in the large coupling regime and persists for environment temperatures at above 25 K in the three-cavity case. Such optomechanical systems can be used for the realization of continuous variable quantum information interfaces and networks.

关键词： entanglement coupled-cavity array optomechanical system

Multi-window transparency and fast–slow light switching in a quadratically coupled optomechanical system assisted with three-level atoms

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Chinese Physics B 2018年第3期27卷 267-273页

作者： Wan-Ying Wei Ya-Fei Yu Zhi-Ming Zhang guangdong provincial key laboratory of Nanophotonic Functional materials and Devices （SIPSE） Guangdong Provincial Key Laboratory of Quantum Engineering Quantum Materials South China Normal University Guangzhou 510006 China

We study theoretically the features of the output field of a quadratically coupled optomechanical system assisted with three-level atoms. In this system, the atoms interact with the cavity field and are driven by a classical field, and the cavity is driven by a strong coupling field and a weak signal field. We find that there exists a multi-window transparency phenomenon. The width of the transparent windows can be adjusted by controlling the system parameters, including the number of the atoms, the powers of the lasers driving the atoms and driving the cavity, and the environment temperature. We also find that a tunable switch from fast light to slow light can be realized in this system.

关键词： quantum optics optomechanics optomechanically induced transparency fast and slow light

Current-induced nonequilibrium spin polarization in semiconductor-nanowire/s-wave superconductor junctions with strong spin–orbit coupling

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Chinese Physics B 2016年第2期25卷 399-405页

作者：刘乃清黄立捷王瑞强胡梁宾 guangdong provincial key laboratory of quantum engineering and quantum materials School of Physics and Telecommunication EngineeringSouth China Normal University

We have studied the characteristics of current-induced nonequilibrium spin polarization in semiconductor-nanowire/swave superconductor junctions with strong spin–orbit coupling. It was found that within some parameter regions the magnitude of the current-induced nonequilibrium spin polarization density in such structures will increase（or decrease） with the decrease（or increase） of the charge current density, in contrast to that found in normal spin–orbit coupled semiconductor structures. It was also found that the unusual characteristics of the current-induced nonequilibrium spin polarization in such structures can be well explained by the effect of the Andreev reflection.

关键词： semiconductor/superconductor junctions spin-orbit coupling Andreev reflection current-induced spin polarization

Coherent charge transport in ferromagnet/semiconductor nanowire/ferromagnet double barrier junctions with the interplay of Rashba spin-orbit coupling, induced superconducting pair potential,and external magnetic field

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Chinese Physics B 2017年第7期26卷 316-322页

作者：黄立捷刘恋王瑞强胡梁宾 guangdong provincial key laboratory of quantum engineering and quantum materials School of Physics and Telecommunication Engineering South China Normal University

By solving the Bogoliubov-de Gennes equation, the influence of the interplay of Rashba spin-orbit coupling, induced superconducting pair potential, and external magnetic field on the spin-polarized coherent charge transport in ferromagnet/semiconductor nanowire/ferromagnet double barrier junctions is investigated based on the Blonder-Tinkham-Klapwijk theory. The coherence effect is characterized by the strong oscillations of the charge conductance as a function of the bias voltage or the thickness of the semiconductor nanowire, resulting from the quantum interference of incoming and outgoing quasiparticles in the nanowire. Such oscillations can be effectively modulated by varying the strength of the Rashba spin-orbit coupling, the thickness of the nanowire, or the strength of the external magnetic field. It is also shown that two different types of zero-bias conductance peaks may occur under some particular conditions, which have some different characteristics and may be due to different mechanisms.

关键词： Rashba spin-orbit coupling induced superconducting pair potential coherent charge transport zero-bias conductance peaks

Effects of interface bound states on the shot noise in normal metal–low-dimensional Rashba semiconductor tunnel junctions with induced s-wave pairing potential

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Chinese Physics B 2019年第5期28卷 268-275页

作者： Wen-Xiang Chen Rui-Qiang Wang Liang-Bin Hu guangdong provincial key laboratory of quantum engineering and quantum materials School of Physics and Telecommunication Engineering South China Normal University

We consider the effects of interface bound states on the electrical shot noise in tunnel junctions formed between normal metals and one-dimensional(1 D) or two-dimensional(2 D) Rashba semiconductors with proximity-induced s-wave pairing potential. We investigate how the shot noise properties vary as the interface bound state is evolved from a non-zero energy bound state to a zero-energy bound state. We show that in both 1 D and 2 D tunnel junctions, the ratio of the noise power to the charge current in the vicinity of zero bias voltage may be enhanced significantly due to the induction of the midgap interface bound state. But as the interface bound state evolves from a non-zero energy bound state to a zero-energy bound state, this ratio tends to vanish completely at zero bias voltage in 1 D tunnel junctions, while in 2 D tunnel junctions it decreases smoothly to the usual classical Schottky value for the normal state. Some other important aspects of the shot noise properties in such tunnel junctions are also clarified.

关键词： interface bound state tunnel junction shot noise

Photon-phonon squeezing and entanglement in a cavity optomechanical system with a flying atom

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Frontiers of physics 2019年第1期14卷 93-98页

作者： Jun-Hao Liu Yu-Bao Zhang Ya-Fei Yu Zhi-Ming Zhang guangdong provincial key laboratory of Nanophotonic Functional materials & Devices (SIPSE) and Guangdong Provincial Key Laboratory of Quantum Engineering & Quantum Materials South China Normal University Guangzhou 510006 China Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials & Devices (SIPSE) and Guangdong Provincial Key Laboratory of Quantum Engineering & Quantum Materials South China Normal University Guangzhou 510006 China

We study the quadrature squeezing and entanglement in a cavity optomechanical system (COMS). In our model, a flying atom sequentially passes through and interacts with the COMS and a Ramsey pulse zone, and subsequently the atomic state is detected. In this way, the photon-phonon squeezing and entanglement can be generated. The dynamic evolution of the squeezing and entanglement in the presence of losses are examined by using the master equation method.

关键词： optomechanics squeezing entanglement

Stationary entanglement between two nanomechanical oscillators induced by Coulomb interaction

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Chinese Physics B 2016年第1期25卷 595-599页

作者：吴琴肖银张智明 guangdong provincial key laboratory of Nanophotonic Functional materials and Devices (SIPSE) Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum MaterialsSouth China Normal University School of Information engineering Guangdong Medical University

We propose a scheme for entangling two nanomechanical oscillators by Coulomb interaction in an optomechanical system. We find that the steady-state entanglement of two charged nanomechanical oscillators can be obtained when the coupling between them is stronger than a critical value which relies on the detuning. Remarkably, the degree of entanglement can be controlled by the Coulomb interaction and the frequencies of the two charged Oscillators.

关键词： entanglement Coulomb interaction optomechanical system

Entangling two oscillating mirrors in an optomechanical system via a flying atom

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Chinese Physics B 2018年第7期27卷 357-361页

作者： Yu-Bao Zhang Jun-Hao Liu Ya-Fei Yu Zhi-Ming Zhang guangdong provincial key laboratory of Nanophotonic Functional materials and Devices（SIPSE） Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum MaterialsSouth China Normal UniversityGuangzhou 510006China

We propose a novel scheme for generating the entanglement of two oscillating mirrors in an optomechanical system via a flying atom. In this scheme, a two-level atom, in an arbitrary superposition state, passes through an optomechanical system with two oscillating cavity-mirrors, and then its states are detected. In this way, we can generate the entangled states of the two oscillating mirrors. We derive the analytical expressions of the entangled states and make numerical calculations. We find that the entanglement of the two oscillating mirrors can be controlled by the initial state of the atom, the optomechanical coupling strength, and the coupling strength between the atom and the cavity field. We investigate the dynamics of the system with dissipations and discuss the experimental feasibility.

关键词： quantum entanglement optomechanical system dissipative dynamics