搜索结果: 1-15 共查到“知识库 量子声学”相关记录23条 . 查询时间(1.031 秒)
Sharp Transition for Single Polarons in the One-Dimensional Su-Schrieffer-Heeger Model
Model of polaron ground-state energy smooth transition coupling electron phonon coupling phonon coupling dynamics
2014/12/18
We study a single polaron in the Su-Schrieffer-Heeger (SSH) model using four different techniques (three numerical and one analytical). Polarons show a smooth crossover from weak to strong coupling, a...
结合金属膜的YZ-LiNbO3压电基片上声表面波陀螺效应分析
声表面波 陀螺效应 陀螺仪 金属点阵
2012/4/22
在声表面波陀螺效应作用过程中，由于哥氏力的作用比较微弱，导致现有的声表面波陀螺仪的检测灵敏度极低。为了改善哥氏力作用，在声表面波传播路径上分布金属点阵以增加质量负载，将有可能获得良好的灵敏度性能。本文结合研究层状介质中声波传输特性的方法对YZ-LiNbO3压电基片上的金属膜层对陀螺效应的影响做了理论计算。对比分析有无金属膜层的压电基片中陀螺效应的大小，以及不同金属材料对陀螺效应的影响作用，验证了用...
含水合物松散沉积物的声学特性对海上天然气水合物地球物理勘探和资源评价具有重要意义.研制了适用于高压条件下含水合物沉积物声学特性探测的纵横波一体化新型弯曲元换能器,提出利用频谱分析(FFT)和小波分析(WT)相结合的方法获取纵横波速度,并进行了多个轮次的水合物声学特性模拟实验研究.结果表明,新型弯曲元技术可以灵敏探测松散沉积物中水合物的生成和分解,随着水合物饱和度(Sh)的增大,纵横波速度呈规律性增...
含水合物松散沉积物的声学特性对海上天然气水合物地球物理勘探和资源评价具有重要意义.研制了适用于高压条件下含水合物沉积物声学特性探测的纵横波一体化新型弯曲元换能器,提出利用频谱分析(FFT)和小波分析(WT)相结合的方法获取纵横波速度,并进行了多个轮次的水合物声学特性模拟实验研究.结果表明,新型弯曲元技术可以灵敏探测松散沉积物中水合物的生成和分解,随着水合物饱和度(Sh)的增大,纵横波速度呈规律性增...
基于高维两粒子纠缠态的超密编码方案
量子纠缠 Bell态 安全性分析 量子超密编码
2011/5/25
基于通信双方预先共享d维二粒子最大纠缠态非定域相关性,信息发送方Bob只需要向信息接收者Alice传送一个粒子,就可以传送logd22比特经典信息,为保护信息的安全,方案采用诱骗光子技术,安全性等价于改进后的原始量子密钥分配方案（Bennett-Brassard 1984,BB84）.本文讨论了基于高维纯纠缠态超密编码方案.即通过引入一个附加量子比特,信息接收方对手中的纠缠粒子和附加粒子在执行相应...
基于匹配场原理的矢量阵三维声源定位研究
声学 矢量阵 匹配场 Bartlett处理器 三维定位
2011/5/19
将匹配场原理应用到矢量水平阵、矢量垂直阵上通过对声源穷举搜索实现三维定位，研究了声压、振速不同组合的定位性能，并对性能表现进行分析，最后给出了垂直阵、水平阵下性能相对好的组合方法。在垂直阵下，需要应用声压、余弦方向水平振速、正弦方向水平振速组合或者垂直振速、余弦方向水平振速、正弦方向水平振速组合；在水平阵下，需要应用垂直振速、余弦方向水平振速、正弦方向水平振速组合。将匹配场原理应用到矢量水平阵、矢...
The Kondo crossover in shot noise of a single quantum dot with orbital degeneracy
Kondo crossover orbital degeneracy
2010/11/11
We investigate out of equilibrium transport through an orbital Kondo system realized in a single quantum dot, described by the multiorbital impurity Anderson model. Shot noise and current are calculat...
Perturbation theory of the mass enhancement for a polaron coupled to acoustic phonons
Perturbation theory of the mass enhancement acoustic phonons
2010/11/8
We use both a perturbative Green’s function analysis and standard perturbative quantum me-
chanics to calculate the decrease in energy and the effective mass for an electron interacting with acoustic...
Large-amplitude chirped coherent phonons in tellurium mediated by ultrafast photoexcited carrier diffusion
Large-amplitude chirped coherent phonons tellurium ultrafast photoexcited carrier diffusion
2010/11/2
We report femtosecond time-resolved reflectivity measurements of coherent phonons in tellurium
performed over a wide range of temperatures (3K to 296K) and pump laser intensities. A totally
symmetri...
Phonon-assisted decoherence and tunneling in quantum dot molecules
quantum dot phonon decoherence tunneling
2010/11/1
We study the influence of the phonon environment on the electron dynamics in a doped quantum dot molecule.A non-perturbative quantumkinetic theory based on correlation expansion is used in order to de...
Enhanced sequential carrier capture into individual quantum dots and quantum posts controlled by surface acoustic waves
Quantum Dots Quantum Posts Surface Acoustic Waves
2010/11/1
Individual self-assembled Quantum Dots and Quantum Posts are studied under the in uence of
a surface acoustic wave. In optical experiments we observe an acoustically induced switching of the occupanc...
Controlling phonon entanglement and squeezing via one- and two-phonon interference
Controlling phonon entanglement squeezing two-phonon interference
2010/11/1
When ultrafast laser pulse strikes the crystal with a van Hove singularity in the phonon density of states, it creates a pair of anti-correlated in wave vector acoustic phonons. As a result, the atomi...
Reduction of quantum noise in optical interferometers using squeezed light
Reduction quantum noise optical interferometers squeezed light
2010/10/25
We study the photon counting noise in optical interferometers used for gravitational wave detection. In order to reduce quantum noise a squeezed vacuum state is injected into the usually unused input ...
Efficient entanglement distribution for quantum communication against collective noise
Efficient entanglement distribution quantum communication against collective noise
2010/10/4
We present an efficient faithful entanglement distribution scheme for quantum communication against collective noise. Its setup is composed of polarizing beam splitters, half wave plates, polarization...
Quantum capacity under adversarial quantum noise: arbitrarily varying quantum channels
Quantum capacity adversarial quantum noise arbitrarily varying quantum channels
2010/10/3
We investigate entanglement transmission over an unknown channel in the presence of a third party (called the adversary), which is enabled to choose the channel from a given set of memoryless but non...