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1.
利用腔场与可移动镜子的作用制备两种非经典态 总被引:1,自引:1,他引:0
描述了在腔场与可移动镜子相互作用系统中,适当选择作用时间,可以制备单模腔场与镜子的纠缠态,或腔场的薛定谔猫态;通过调节腔场的长度、圆频率,以及镜子的质量、振动频率等宏观物理量,可以获得不同的量子态. 相似文献
2.
增光子二模纠缠相干态的纠缠特性及其通过腔量子电动力学的制备 总被引:2,自引:1,他引:1
分析了增光子二模纠缠相干态的纠缠特性,得到共生纠缠度的解析表示式.结果表明:增光子二模纠缠相干态的共生纠缠度与叠加态的相位有非常灵敏的关系.提出了一种制备增光子相干态和增光子二模纠缠相干态的方法,其制备过程为首先把增光子相干态转化为相干态与真空态一种特殊的叠加态(叠加系数与相干态振幅有关),再通过位于高Q腔内的原子与经典激光场的相互作用,从而实现增光子相干态的制备.通过一个飞行原子先后与两个光腔中光场相互作用可以实现增光子二模纠缠相干态的制备. 相似文献
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GUO Jian-Hong 《理论物理通讯》2004,41(1):37-40
The interaction of $N$ two-level atoms with both a two-mode cavity
field and an external classical pumping field, and with the fields being
degenerate in frequency, is studied in the regime where the atoms
and fields are highly detuned. This dispersive interaction
can be used to generate a large number of important entangled coherent states
conditional on the initial atomic states and state-selective measurements.
A dynamical relation is established between the results for the case with continuous
pumping and the case without external driving where the coherent field is
put in as the initial condition. 相似文献
5.
A scheme for generating cluster states via Raman interaction is proposed. In the scheme, we firstly prepare cluster states of multi-cavities with information encoded in the coherent states and then generate cluster states of multiatoms, which encode the information in the ground states of A-type atoms. The advantages of our scheme are that the atomic spontaneous radiation can be efficiently reduced since the cavity frequency is largely detuned from the atomic transition frequency and the Hadamard gate operation of the coherent states is replaced by measuring the coherent states. 相似文献
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We investigate the particle-hole pair excitations of dipolar molecules in an optical lattice, which can be described with an extended Bose-Hubbard model. For strong enough dipole-dipole interaction, the particle-hole pair excitations can form bound states in one and two dimensions. With decreasing dipole-dipole interaction, the energies of the bound states increase and merge into the particle-hole continuous spectrum gradually. The existence regions, the energy spectra and the wave functions of the bound states are carefully studied and the symmetries of the bound states are analyzed with group theory. For a given dipole-dipole interaction, the number of bound states varies in momentum space and a number distribution of the bound states is illustrated. We also discuss how to observe these bound states in future experiments. 相似文献
8.
Mixed symmetry states are studied in the framework of the neutron-proton interacting boson model.It is found that some of the mixed symmetry states with moderate high spins change very fast with respect to the Majorana interaction.Under certain conditions,they become the yrast state or yrare state.These states are difficult to decay and become very stable.This study suggests that a possible new mode of isomers may exist due to the special nature in their proton and neutron degrees of freedom. 相似文献
9.
We present a scheme to prepare an optical “quantum switch”, a superposition of “open” and “closed” states. The scheme is based on the interaction of an Λ-type three-level atom with a single-mode of quantized cavity field and an external classical driving field, in the regime where the atom and fields are highly detuned. We show how this interaction can be used to generate coherent states of the cavity field in contrast to the usual method used in microwave cavity QED of injecting a coherent state into a cavity. A combination of switches could be used to prepare a quantum superposition of coherent field states located simultaneously in two cavities. Compared with previous proposals, our scheme is simplified due to economizes the Ramsey zone and the time required for the state generation is short. 相似文献
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Y R Waghmare 《Pramana》1977,9(1):7-25
A self-consistent procedure for calculating the particle-hole states of nuclei is given. This has been applied to the levels
of16O nucleus. The particle-hole interaction is derived using Landau theory. The basis states are generated using the Brueckner
many-body theory, and used in the random-phase-approximation calculation. The sensitivity of the 3- state at 6.13 MeV with
the interaction is discussed, the other states being reasonably insensitive to such a choice. The effect of renormalization
of the particle-hole interaction, on various states is also discussed. 相似文献
12.
钡原子高激发态的研究 总被引:1,自引:1,他引:0
采用多步激发方式研究了钡原子高激发态光谱特性和组态相互作用,并运用多通道量子亏损理论对实验数据进行了初步分析。通过自电离探测方式可对束缚Rydberg系列和自电离Rydberg系列同时进行研究,显示了多方面的优点 相似文献
13.
Multipartite entanglement in the interaction system between a single-mode microwave cavity field and superconducting charge qubits
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This paper proposes a method of generating multipartite entanglement through using
d.c. superconducting quantum interference devices (SQUID) inside a standing
wave cavity. In this scheme, the d.c. SQUID works in the charge region. It
is shown that, a large number of important multipartite entangled states can
be generated by a controllable interaction between a cavity field and
qubits. It is even possible to produce entangled states involving different
cavity modes based on the measurement of charge qubits states. After such
superpositions states are created, the interaction can be switched off by
the classical magnetic field through the SQUID, and there is no information
transfer between the cavity field and the charge qubits. 相似文献
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The negativity of the discrete Wigner functions (DWFs) is a measure of non-classicality and is often used to quantify the degree of quantum coherence in a system. The study of Wigner negativity and its evolution under different quantum channels can provide insight into the stability and robustness of quantum states under their interaction with the environment, which is essential for developing practical quantum computing systems. The variation of DWF negativity of qubit, qutrit, and two-qubit systems under the action of (non)-Markovian random telegraph noise (RTN) and amplitude damping (AD) quantum channels is investigated. Different negative quantum states that can be used as a resource for quantum computation and quantum teleportation are constructed. The success of quantum computation and teleportation is estimated for these states under (non)-Markovian evolutions. 相似文献
16.
通过分析光学分束器对单光子态的作用关系,提出了一个利用分束器和光子数探测器的单光子纠缠的直接测量方案.方案中用到单光子与空间模纠缠及其两个备份,并让它们通过一个50:50的分束器.选用并发度为纠缠度量,其可由单光子探测器的探测概率直接获得.此方案不需复杂的量子态层析方法,同时只用到在量子信息处理中常用的光学器件,增强了方案在实验上实现的可行性. 相似文献
17.
N.G. AghekyanE.M. Kazaryan A.A. KostanyanH.A. Sarkisyan 《Superlattices and Microstructures》2011,50(3):199-206
Two electronic states in impenetrable spherical quantum nanolayer are discussed. The Coulomb interaction between the electrons is considered as perturbation. The problem is discussed within the frameworks of Russell-Saunders coupling scheme, that is, the spin-orbit interaction is neglected. For this system the analogue of helium atom theory is represented. The dependence of the Coulomb interaction energy of the two electronic system is obtained both upon inner and outer radiuses of the studied nanolayer. The exchange interaction in the spherical nanolayer helium atom and its dependence upon the geometrical parameters of the nanolayer are investigated. It is shown that the exchange time of two electron states could be controlled via changing the geometrical parameters of the nanolayer. 相似文献
18.
WANG Zhong-Jie 《理论物理通讯》2010,54(6):1109-1111
Several schemes have been proposed to prepare two-mode squeezed state and entanglement state between motional states of a single trapped ion and light. Preparation of two-mode squeezed state is based on interaction of a trapped ion located in light cavity with cavity field. Preparation of entanglement state is based on interaction of a trapped ion located in light cavity with cavity field and a traveling wave light field. 相似文献
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20.
Generation of any superposition of coherent states along a straight line via resonant atom-cavity interaction
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This paper proposes a scheme for generating arbitrary
superpositions of several coherent states along a straight line for
a cavity mode. In the scheme, several atoms are sent through a
cavity initially in a strong coherent state. The superposition of
several coherent states with desired coefficients may be generated
if each atom is detected in the excited state after it exits the
cavity. The scheme is based on resonant atom--cavity interaction and
no classical field is required during and after the atom--cavity
interaction. Thus, the scheme is very simple and the interaction
time is very short, which is important in view of decoherence. 相似文献