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Resonant Transmission Through Two Impurities in a Narrow Quantum Wire
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作者 宋小龙 赵志云 +1 位作者 汪源 施耀铭 《Journal of Shanghai University(English Edition)》 CAS 2003年第4期361-365,共5页
We study electron transmission through two impurities in a narrow quantum wire by solving Dyson's equations for single electron Green functions. We have verified that, for the delta-function potential of two impur... We study electron transmission through two impurities in a narrow quantum wire by solving Dyson's equations for single electron Green functions. We have verified that, for the delta-function potential of two impurities, the Green function can be factorized into a product of the ‘free’ Green function and current transmission amplitude. Meanwhile Green function and current transmission amplitude obey Fisher-Lee's relation. An analytical expression of the electron transmission amplitude for intrasubband and intersubband is obtained as a function of Fermi energy and the distance between two impurities. The resonant behavior of the current transmission amplitude are detail discussed. 展开更多
关键词 resonant transmission quantum wire evanescent mode.
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Scheme for realizing quantum computation and quantum information transfer with superconducting qubits coupling to a 1D transmission line resonator
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作者 施振刚 谌雄文 +1 位作者 朱喜香 宋克慧 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第3期910-914,共5页
This paper proposes a simple scheme for realizing one-qubit and two-qubit quantum gates as well as multiqubit entanglement based on de-SQUID charge qubits through the control of their coupling to a 1D transmission lin... This paper proposes a simple scheme for realizing one-qubit and two-qubit quantum gates as well as multiqubit entanglement based on de-SQUID charge qubits through the control of their coupling to a 1D transmission line resonator (TLR). The TLR behaves effectively as a quantum data-bus mode of a harmonic oscillator, which has several practical advantages including strong coupling strength, reproducibility, immunity to 1/f noise, and suppressed spontaneous emission. In this protocol, the data-bus does not need to stay adiabatically in its ground state, which results in not only fast quantum operation, hut also high-fidelity quantum information processing. Also, it elaborates the transfer process with the 1D transmission line. 展开更多
关键词 dc-SQUID charge qubits 1D transmission line resonator quantum logic gates quantum information transfer
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Extraordinary Acoustic Transmission in a Helmholtz Resonance Cavity-Constructed Acoustic Grating
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作者 余思远 倪旭 +4 位作者 徐叶龙 何程 Priyanka Nayar 卢明辉 陈延峰 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第4期64-67,共4页
We investigate both experimentally and numerically a complex structure, where 'face-to-face' Helmholtz resonance cavities (HRCs) are introduced to construct a one-dimensional acoustic grating. In this system, pair... We investigate both experimentally and numerically a complex structure, where 'face-to-face' Helmholtz resonance cavities (HRCs) are introduced to construct a one-dimensional acoustic grating. In this system, pairs of HRCs can intensely couple with each other in two forms: a bonding state and an anti-bonding state, analogous to the character of hydrogen molecule with two atoms due to the interference of wave functions of sound among the acoustic local-resonating structures. The bonding state is a 'bright' state that interferes with the Fabry-Pbrot resonance mode, thereby causing this state to break up into two modes as the splitting of the extraordinary acoustic transmission peak. On the contrary, the anti-bonding state is a 'dark' state in which the resonance mode remains entirely localized within the HRCs, and has no contribution to the acoustic transmission. 展开更多
关键词 of on in Extraordinary Acoustic transmission in a Helmholtz Resonance Cavity-Constructed Acoustic Grating mode HRC is FP
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A simple scheme to generate χ-type four-charge entangled states in circuit QED 被引量:2
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作者 高贵龙 宋付权 +4 位作者 黄寿胜 王辉 袁先漳 王明锋 姜年权 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第4期331-335,共5页
We propose a simple scheme to generate x-type four-charge entangled states by using SQUID-based charge qubits capacitively coupled to a transmission line resonator (TLR). The coupling between the superconducting qub... We propose a simple scheme to generate x-type four-charge entangled states by using SQUID-based charge qubits capacitively coupled to a transmission line resonator (TLR). The coupling between the superconducting qubit and the TLR can be effectively controlled by properly adjusting the control parameters of the charge qubit. The experimental feasibility of our scheme is also shown. 展开更多
关键词 x-type entangled state superconducting quantum interference device transmission line resonator superconducting charge qubit
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One-dimensional PT-symmetric acoustic heterostructure 被引量:1
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作者 Hai-Xiao Zhang Wei Xiong +1 位作者 Ying Cheng Xiao-Jun Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第12期289-294,共6页
The explorations of parity-time(PT)-symmetric acoustics have resided at the frontier in physics,and the pre-existing accessing of exceptional points typically depends on Fabry-Perot resonances of the coupling interlay... The explorations of parity-time(PT)-symmetric acoustics have resided at the frontier in physics,and the pre-existing accessing of exceptional points typically depends on Fabry-Perot resonances of the coupling interlayer sandwiched between balanced gain and loss components.Nevertheless,the concise PT-symmetric acoustic heterostructure,eliminating extra interactions caused by the interlayer,has not been researched in depth.Here we derive the generalized unitary relation for one-dimensional(1D)PT-symmetric heterostructure of arbitrary complexity,and demonstrate four disparate patterns of anisotropic transmission resonances(ATRs)accompanied by corresponding spontaneous phase transitions.As a special case of ATR,the occasional bidirectional transmission resonance reconsolidates the ATR frequencies that split when waves incident from opposite directions,whose spatial profiles distinguish from a unitary structure.The derived theoretical relation can serve as a predominant signature for the presence of PT symmetry and PT-symmetry-breaking transition,which may provide substantial support for the development of prototype devices with asymmetric acoustic responses. 展开更多
关键词 acoustic PT-symmetric heterostructure anisotropic transmission resonance occasional bidirectional transmission resonance
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Electronic transport through a periodic array of quantum-dot rings
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作者 薛海斌 张瀚尹 +2 位作者 聂一行 李志坚 梁九卿 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第4期381-387,共7页
Using the tight-binding approximation and the transfer matrix method, this paper studies the electronic transport properties through a periodic array of quantum-dot (QD) rings threaded by a magnetic flux. It demonst... Using the tight-binding approximation and the transfer matrix method, this paper studies the electronic transport properties through a periodic array of quantum-dot (QD) rings threaded by a magnetic flux. It demonstrates that the even^odd parity of the QD number in a single ring and the number of the QD rings in the array play a crucial role in the electron transmission. For a single QD ring, the resonance and antiresonance transmission depend not only on the applied magnetic flux but also on the difference between the number of QDs on the two arms of the ring. For an array of QD rings, the transmission properties are related not only to the even-odd parity of the number No of QDs in the single ring but also to the even-odd parity of the ring number N in the array. When the incident electron energy is aligned with the site energy, for the array of N rings with No = odd the antiresonance transmission cannot occur but the resonance transmission may occur and the transmission spectrum has N resonance peaks (N - 1 resonance peaks) in a period for N = odd (for N = even). For the array of N rings with No = even the transmission properties depend on the flux threading the ring and the QD number on one arm of the ring. These results may be helpful in designing QD devices. 展开更多
关键词 quantum dots electronic transport antiresonance transmission resonance transmission
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1→N quantum controlled phase gate realized in a circuit QED system 被引量:4
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作者 GAO GuiLong CAI GenChang +4 位作者 HUANG.ShouSheng TANG LongYing GU WenJing WANG MingFeng JIANG-NianQuan 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第8期1422-1426,共5页
We propose an effective method to realize the quantum phase gate the system in which the transmon qubits are capacitively coupled to of one qubit simultaneously controlling N qubits. We use a superconducting transmiss... We propose an effective method to realize the quantum phase gate the system in which the transmon qubits are capacitively coupled to of one qubit simultaneously controlling N qubits. We use a superconducting transmission line resonator driven by a strong microwave field. In our scheme, the phase gate can be realized in a time (nanosecond-scale) much shorter than deco herence time (microsecond-scale), and it is more immune to the l/(charge noise and has longer dephasing time due to the fa vorable properties of the transmon qubits in the system. 展开更多
关键词 phase gate transmon qubit transmission line resonator
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A SCATTERING MATRIX MODEL OF SEMICONDUCTOR SUPERLATTICES IN MULTIDIMENSIONAL WAVE-VECTOR SPACE AND ITS DIFFUSION LIMIT
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作者 P.DEGOND ZHANGKAIJUN 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2003年第2期167-190,共24页
The authors first establish a quantum microscopic scattering matrix model in multidimen-sional wave-vector space, which relates the phase space density of each superlattice cell withthat of the neighbouring cells. The... The authors first establish a quantum microscopic scattering matrix model in multidimen-sional wave-vector space, which relates the phase space density of each superlattice cell withthat of the neighbouring cells. Then, in the limit of a large number of cells, a SHE (SphericalHarmonics Expansion)-type model of diffusion equations for the particle number density in theposition-energy space is obtained. The crucial features of diffusion constants on retaining thememory of the quantum scattering characteristics of the superlattice elementary cell (like e.g.transmission resonances) are shown in order. Two examples are treated with the analyticallycomputation of the diffusion constants. 展开更多
关键词 SUPERLATTICES Scattering matrix model Diffusion approximation Spherical harmonics expansion DRIFT-DIFFUSION Energy transport transmission resonance
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One-Step Generation of Multi-Qubit GHZ and W States in Superconducting Transmon Qubit System
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作者 高贵龙 蔡根畅 +2 位作者 黄寿胜 王明锋 姜年权 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第2期205-208,共4页
We propose a one-step method to prepare multi-qubit GHZ and W states with transmon qubits capacitively coupled to a superconducting transmission line resonator(TLR).Compared with the scheme firstly introduced by Wang ... We propose a one-step method to prepare multi-qubit GHZ and W states with transmon qubits capacitively coupled to a superconducting transmission line resonator(TLR).Compared with the scheme firstly introduced by Wang et al.[Phys.Rev.B 81(2010) 104524],our schemes have longer dephasing time and much shorter operation time because the transmon qubits we used are not only more robust to the decoherence and the unavoidable parameter variations,but also have much stronger coupling constant with TLR.Based on the favourable properties of transmons and TLR,our method is more feasible in experiment. 展开更多
关键词 transmon transmission line resonator GHZ state W state
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Robust Quantum Computing in Decoherence-Free Subspaces with Double-Dot Spin Qubits
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作者 冯志波 张春丽 周运清 《Communications in Theoretical Physics》 SCIE CAS CSCD 2014年第2期181-186,共6页
We present a scheme for implementing robust quantum gates in decoherence-free subspaces(DFSs) with double-dot spin qubits. Through the resonator-assisted interaction, the controllable interqubit couplings can be achie... We present a scheme for implementing robust quantum gates in decoherence-free subspaces(DFSs) with double-dot spin qubits. Through the resonator-assisted interaction, the controllable interqubit couplings can be achieved only by adjusting the qubit transition frequencies. We construct a set of logic gates on the DFS-encoded qubits to eliminate the collective noise effects, and thus the gate fidelities can be enhanced remarkably. This proposal may offer a potential approach to realize the robust quantum computing with spin qubits. 展开更多
关键词 decoherence-free subspace double-dot spin qubit transmission line resonator
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Efficient design of rotary traveling wave oscillator array via geometric programming
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作者 Li-jia CHEN Hua-feng ZHANG +1 位作者 Jin-fang ZHOU Kang-sheng CHEN 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2009年第12期1815-1823,共9页
This paper presents an efficient method for globally optimizing and automating component sizing for rotary traveling wave oscillator arrays. The lumped equivalent model of transmission lines loaded by inverter pairs i... This paper presents an efficient method for globally optimizing and automating component sizing for rotary traveling wave oscillator arrays. The lumped equivalent model of transmission lines loaded by inverter pairs is evaluated and posynomial functions for oscillation frequency, power dissipation, phase noise, etc. are formulated using transmission line theory. The re- sulting design problem can be posed as a geometric programJning problem, which can be efficiently solved with a convex opti- mization solver. The proposed method can compute the global optima more efficiently than the traditional iterative scheme and various design problems can be solved with the same circuit model. The globally optimal trade-off curves between competing objectives are also computed to carry out robust designs and quickly explore the design space. 展开更多
关键词 Rotary traveling wave oscillator array (RTWOA) Clock distribution transmission line resonator Global optimi-zation Geometric programming (GP)
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