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Preparation of Entanglement and Schrdinger Cat States of Superconducting Quantum Interference Devices Qubits via Coupling to a Microwave Cavity

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Communications in Theoretical Physics 2008年第3期49卷 643-648页

作者： yang wen-xing Department of Physics Southeast University Nanjing 210096 China Wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Wuhan 430071 China

An alternative scheme is proposed for the generation of n-qubit W states of superconducting quantum interference devices （SQUID） in cavity QED. In this scheme, Raman coupling of two lower flux states of SQUID system is achieved via a microwave pulse and the cavity mode. Conditioned on no photon leakage from the cavity, the n-qubit W state can be generated whether the effective coupling parameters of the SQUID to cavity mode and classical microwave fields are the same or different. Our strictly numerical simulations of the time evolution of the system including decay show that the success probability of our scheme is almost unity and the interaction time is on the order of 10-9 s. The scheme can also be used to generate the Schrodinger cat states of multi-SQUID.

关键词： entanglement superconducting cavity

Jnconventional Geometric Phase Gate with Superconducting Quantum Interference Device Qubits in Cavity QED

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Communications in Theoretical Physics 2008年第4期49卷 913-918页

作者： yang wen-xing CHEN Ai-Xi Department of Physics Southeast University Nanjing 210096 China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Center for Cold Atom Physics Wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Wuhan 430071 China Department of Physics East China Jiaotong University Nanchang 330013 China

In the system with superconducting quantum interference devices （SQUID） in cavity, a scheme for constructing two-qubit quantum phase gate via a conventional geometric phase-shift is proposed by using a quantized cavity field and classical microwave pulses. In this scheme, the gate operation is realized in the subspace spanned by the two lower flux states of the SQUID system mud the population operator of the excited state has no effect on it. Thus the effect of decoherence caused from the levels of the SQUID system is possible to minimize. Under cavity decay, our strictly numerical simulation shows that it is also possible to realize the unconventional geometric phase gate. The experimental feasibility is discussed in detail.

关键词： superconducting quantum interference devices cavity QED geometric quantum gates

Storage of Entangled States with Multiple Trapped Ions in Thermal Motion

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Communications in Theoretical Physics 2006年第4期45卷 605-608页

作者： GONG Xiao-Long yang wen-xing Department of Physics Yangtze University Jingzhou 434100 China Department of Physics Huazhong University of Science and Technology Wuhan 430074 China Wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Wuhan 430071 China

This paper presents an alternative scheme to realize the storage of entangled states for multiple trapped ions including W state, Bell states, and GHZ states even with ions which exchange vibrational energy with a heating surrounding, Our scheme requires that the ions be simultaneously excited by two laser beams with different frequencies. In this scheme the vibrational degrees of freedom are only regarded as intermediate states and the ions exchange energy via the mediation of the vibration of the vibrational mode in coupling processes. The scheme is insensitive to both the initial vibrational state and heating if the system remains in the Lamb Dicke regime. Since the effective Rabi frequency has a small dependence on the vibrational quantum number the heating will have no direct, effect on the internal state evolution.

关键词： entangled state storage trapped ions

Two Schemes for Generation of Entanglement for Vibronic Collective States of Multiple Trapped Ions

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Communications in Theoretical Physics 2007年第3期47卷 421-426页

作者： yang wen-xing LI Jia-Hua ZHNG An-Shou Department of Physics Southeast University NanJing 210096 China Molecular Physics Center for Cold Atom Physics Wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Wuhan 430071 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China Department of Physics Huazhong University of Science and Technology Wuhan 430074 China

We propose two schemes to prepare entanglement for the vibronic collective states of multiple trapped ions. The first scheme aims to generating multipartite entanglement for vibrational modes of trapped ions, which only requires a single laser beam tuned to the ionic carrier frequency. Our scheme works in the mediated excitation regime, in which the corresponding Rabi frequency is equal to the trap frequency. Beyond their fundamental importance, these states may be of interest for experimental studies on decoherence since the present scheme operates in a fast way. The second scheme aims to preparing the continuous variable multimode maximal1y Greenberger-Horne-Zeilinger state. The distinct advantage is that the operation time is only limited by the available laser intensity, not by the inherent mechanisms such as off-resonant excitations. This makes it promising to obtain entanglernent of multiple coherent and squeezing states with desired amplitudes in a reasonable time.

关键词： multipartite entanglement GHZ state trapped ions

Entangled Fields in Multiple Cavities by Interaction with One Three-Level Atom

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Communications in Theoretical Physics 2006年第1期45卷 151-153页

作者： ZHAN Zhi-Ming LI Jia-Hua yang wen-xing LI Wei-Bin School of Physics ＆ Information Engineering Jianghan University Wuhan 430056 China Department of Physics Huazhong University of Science and Technology Wuhan 430074 China Center for Cold Atom Physics the Chinese Academy of Sciences Wuhan 430071 China

We present a scheme to entangle fields in multiple cavities. Our scheme is based on the resonant interaction of a ≡-type three-level atom with the cavity fields for precalculated interaction time, which enables us to generate a quantum entangled Greenberger-Horn-Zeilinger （GHZ） state of fields in multiple cavities. In principle, the scheme can be also generalized to generate N-party GHZ state. The required experimental techniques are within the scope of what can be obtained in the microwave cavity QED set up.

关键词： cavity GHZ state ≡-type atom

Carrier-Envelope-Phase Control of Single-Electron Transport in Coupled Quantum Dots

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Chinese Physics Letters 2013年第11期30卷 102-105页

作者： yang wen-xing CHEN Ai-Xi BAI Yan-Feng LU Jia-Wei Department of Physics Southeast UniversityNanjing 210096 Department of Applied Physics School of Basic ScienceEast China Jiaotong UniversityNanchang 330013

We propose a scheme for controlling the coherent transport of a single electron through a closed three-level structure in coupled quantum *** coherent transport is externally controlled by applying a weak few-cycle pulse with an adjustable carrier-envelope phase(CEP).It is revealed numerically that there exists a significant dependence of the electron transport on the *** results illustrate the potential to utilize few-cycle pulses for the excitation in coupled quantum dot systems through control of the CEP,as well providing guidance in the design for possible experimental implementations.

关键词： coherent quantum utilize

Modulated Terahertz Transmission through Sub-Wavelength Cu Grating by Liquid Water

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Chinese Physics Letters 2010年第1期27卷 64-66页

作者：陈华吴秀梅杨文星 Department of Physics Southeast University Nanjing 210096

Submerging the sub-wavelength Cu wire grating in liquid water, we prove that the transmission ration can be changed pronouncedly from 0.1THz to 1.7THz. The modulation of terahertz responses by liquid water is explained by the increasing effective electron mass in the plasmon picture. Due to this response, we extract the index of liquid water, and our results provide a potential application of using metal grating to detect real solvated condition biomaterials in the THz frequency range.

关键词： Chinese climate network complex systems small world community

Loupe-assisted versus microscopic varicocelectomy： s there an intraoperative anatomic difference？

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Asian Journal of Andrology 2014年第1期16卷 112-114页

作者： Hao Zhang Xiao-Peng Liu Xiao-Jian yang wen-Tao Huang xing-xing Ruan Heng-Jun Xiao Liao-Yuan Li Xin Gao Yan Zhang Department of Urology The Third Affiliated Hospital of Sun Yat-sen University Guangzhou China

The aim of this study was to compare the intraoperative difference in anatomic details between Ioupe-assisted and microscopic varicocelectomy within the same spermatic cord. Between April 2011 and August 2011, 26 men with 33 sides containing grade 2-3 varicocele were enrolled in this study. First, one surgeon performed the open inguinal varicocelectomy under x 3.5 Ioupe magnification. The presumed vascular channels and lymphatics were isolated and marked without ligation. Another surgeon then microsurgically dissected and checked the same spermatic cord using an operating microscope to judge the results in terms of the ligation of the internal spermatic veins and the preservation of the arteries and lymphatics. There were significant differences in the average number of internal spermatic arteries （1.51 vs 0.97）, internal spermatic veins （5.70 vs 4.39） and lymphatics （3.52 vs 1.61） between the microscope and Ioupe-assisted procedures （P 〈 0.001, P 〈 0.001, P 〈 0.001, respectively）. Meanwhile, in varicocele repair with Ioupe magnification, an average of 1.30 β± 1.07 （43/33） internal spermatic veins per side were missed, among the overlooked veins, 1.12 ± 0.93 （37/33） were adhered to the preserved testicular artery, as well as 0.55 ± 0.79 lymphatics and 0.36 ± 0.55 arteries that were to be ligated. In conclusion, microscopic varicocelectomy could preserve more internal spermatic arteries and lymphatics and could ligate more veins than the Ioupe-assisted procedure. To some degree, Ioupe magnification is inadequate for the reliable identification and dissection of the tiny vessels of the spermatic cord, as most of the overlooked veins were adhered to the preserved testicular artery.

关键词： intraoperative difference Ioupe-assisted microscopic varicocelectomy

Lenalidomide regulates the CCL21/CCR7/ERK1/2 axis to inhibit migration and proliferation in diffuse large B-cell lymphoma

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Oncology Research 2025年第1期33卷 199-212页

作者： wen yang BIN TANG DAN XU wenXIU yang Department of Pathology Guizhou Medical UniversityThe Affiliated Hospital of Guizhou Medical UniversityGuiyang550004China

Background:The prognostic significance of the chemokine receptor CCR7 in diffuse large B-cell lymphoma(DLBCL)has been reported ***,the detailed mechanisms of CCR7 in DLBCL,particularly regarding its interaction with lenalidomide treatment,are not fully ***:Our study utilized bioinformatics approaches to identify hub genes in SU-DHL-2 cell lines treated with lenalidomide compared to control *** data and clinical information from 122 patients with DLBCL were analyzed to assess the correlation of CCR7 and p-ERK1/2 expression with the prognosis of ***,in vitro and in vivo experiments were conducted to clarify the role of CCR7 in the response of DLBCL to lenalidomide ***:Our bioinformatics analysis pinpointed CCR7 as a hub gene in the context of lenalidomide treatment in ***,31.14%and 36.0%(44/122)of DLBCL cases showed positive expression for CCR7 and ERK1/2 respectively,establishing them as independent prognostic factors for adverse outcomes in DLBCL via multivariate Cox regression ***,our studies demonstrated that the external application of the protein CCL21 promoted proliferation,migration,invasion,and activation of the ERK1/2 pathway in SU-DHL-2 and OCI-LY3 cell lines with high levels of CCR7 *** effect was mitigated by CCR7 silencing through siRNA,application of ERK inhibitors,or lenalidomide *** vivo experiments reinforced the efficacy of lenalidomide,significantly reducing tumor growth rate,tumor mass,serum total LDH levels,and expression of CCR7 and p-ERK1/2 in a SUDHL-2 xenograft model in nude mice(p<0.05).Conclusion:Our study clarifies the potential role of the CCL21/CCR7/ERK1/2 axis in the therapeutic effects of lenalidomide in DLBCL treatment.

关键词： CCR7 CCL21 ERK1/2 Lenalidomide Diffuse large B-cell lymphoma(DLBCL)