共查询到20条相似文献,搜索用时 15 毫秒
1.
基于两原子同时和腔场共振作用制备两原子纠缠态的腔QED方案(英文) 总被引:1,自引:1,他引:0
我们提出了一个将两个远离的原子制备成纠缠态的腔QED方案,该方案基于两个原子同时和一个腔场发生共振作用.在这个方案里,我们利用一个事先制备好的纠缠态将另外两个分离的原子制备成纠缠态.该方案仅包含两个原子和腔场的共振相互作用,不需要用腔场存储量子信息,并且原子和腔场作用时间极短.因此,我们的方案基于目前的腔QED技术是可以实现的. 相似文献
2.
This paper presents a scheme for realizing the frequency
up-conversion between two collective atomic modes. In the scheme two
atomic samples are coupled to a cavity mode. Under the large
detuning condition, the two collective atomic modes are coupled via
the virtual excitation of the cavity mode and the effective
Hamiltonian corresponds to the frequency up-conversion. In the
scheme the cavity mode is only virtually excited and thus the
process is insensitive to cavity decay. 相似文献
3.
We propose a scheme for direct measurement of the Wigner function for a cavity mode. In the scheme the cavity field resonantly interacts with an atomic ensemble. Under certain conditions, the state of the cavity mode is transferred to the atomic system. After a displacement the measurement of the parity of the atomic excitation number directly yields the Wigner function of the initial state of the cavity mode. 相似文献
4.
A feasible scheme for constructing quantum logic gates is proposed on the basis of quantum switches in cavity QED. It is shown that the light field which is fed into the cavity due to the passage of an atom in a certain state can be used to manipulate the conditioned quantum logical gate. In our scheme, the quantum information is encoded in the states of Rydberg atoms and the cavity mode is not used as logical qubits or as a communicating “bus”; thus, the effect of atomic spontaneous emission can be neglected and the strict requirements for the cavity can be relaxed. 相似文献
5.
ZHENGShi-Biao LINLi-Hua JIANGYun-Kun 《理论物理通讯》2003,40(1):103-104
An efficient scheme is proposed for the generation of atomic Schroedinger cat states in an optical cavity. In the scheme N three-level atoms are loaded in the optical cavity. Raman coupling of two ground states is achieved via a laser tield and the cavity mode. The cavity mode is always in the vacuum state and the atoms have no probability of being populated in the excited state. Thus, the scheme is insensitive to both the cavity decay and spontaneous emission. 相似文献
6.
Zong-Liang Liu Shao-Hua Li Chang-Yong Chen 《International Journal of Theoretical Physics》2009,48(8):2365-2371
A scheme for approximate and conditional teleportation of an unknown atomic state via dissipative two-photon interaction in
cavity QED is proposed. In our scheme, the dissipative two-photon interaction Jaynes-Cummings model is used to realize the
approximate and conditional teleportation. We investigate analytically the influence of the cavity mode decay on the teleportation
fidelity and show that the high fidelity teleportation can be implemented in dissipative case. Our scheme does not involve
the Bell-state measurement and an additional atom, only requiring two atoms and one single-mode cavity. The scheme may be
generalized to not only the teleportation of the state of a cavity mode to another mode by means of a single atom but also
the teleportation of the state of a trapped ion. 相似文献
7.
An efficient scheme is proposed for the generation of atomic Schrodinger cat states in an optical cavity. Inthe scheme N three-level atoms are loaded in the optical cavity. Raman coupling of two ground states is achieved via alaser field and the cavity mode. The cavity mode is always in the vacuum state and the atoms have no probability ofbeing populated in the excited state. Thus, the scheme is insensitive to both the cavity decay and spontaneous emission. 相似文献
8.
CHEN Chang-Yong 《理论物理通讯》2008,49(4):871-876
We propose a potentially practical scheme to implement an approximate three-qubit Toffoli gate by a single resonant interaction in dissipative cavity QED in which the cavity mode decay and atomic spontaneous emission are considered. The scheme does not require two-qubit controlled-NOT gates but uses a three-qubit phase gate and two Hadamard gates, where the approximate phase gate can be implemented by only a single dissipative resonant interaction of atoms with the cavity mode. Discussions are made for the advantages and the experimental feasibility of our scheme. 相似文献
9.
Shi-Biao Zheng 《Optics Communications》2007,278(2):345-349
We propose an efficient scheme for realizing squeezing for a cavity mode. In the scheme, a collection of ladder-type three-level atoms are trapped in a cavity and driven by two classical fields. Under certain conditions, the cavity field deterministically evolves to a squeezed state. The scheme can also be used for conditional generation of superpositions of different squeezed vacuum states. 相似文献
10.
Resonant interaction scheme for GHZ state preparation and quantum phase gate with superconducting qubits in a cavity
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A scheme is proposed to generate GHZ state and realize quantum phase gate for superconducting qubits placed in a microwave cavity. This scheme uses resonant interaction between the qubits and the cavity mode, so that the interaction time is short, which is important in view of decoherence. In particular, the phase gate can be realized simply with a single interaction between the qubits and the cavity mode. With cavity decay being considered, the fidelity and success probability are both very close to unity. 相似文献
11.
ZHENG Shi-Biao 《理论物理通讯》2006,45(6):1011-1012
We propose a scheme for realizing dense coding in cavity QED.
The scheme is based on the resonant interaction of two atoms
with a cavity mode. The scheme may be realizable with presently
available techniques in the microwave cavity QED setup. The idea
can also be generalized to the ion trap system. 相似文献
12.
We propose a scheme for implementing a measurement of GHZ entanglement for a multipartite system via cavity QED. In the scheme the atoms interact simultaneously with a highly detuned cavity mode with the assistant of a classical field. The scheme is insensitive to the cavity decay and the thermal field. A set of GHZ states can be exactly distinguished via detecting atomic state in a simple way. 相似文献
13.
We propose a scheme for the generation of a genuine five-atom entangled state in cavity QED. In our scheme, the atoms interact simultaneously with a highly detuned cavity mode with the assistance of a strong classical driving field. Thus the scheme is insensitive to both the cavity decay and the thermal field, which is of importance from the experimental point of view. 相似文献
14.
N. Zhang 《International Journal of Theoretical Physics》2013,52(8):2833-2837
We investigate quantum dense coding based on entangled Bell states in cavity QED. We implement a experimentally feasible new scheme in cavity QED with atomic qubits where the atoms interact with a highly detuned cavity mode with the assistance of a classical field. The scheme is insensitive to the cavity decay and the thermal field. Based on cavity QED techniques, the scheme can be realizable. 相似文献
15.
CHEN Chang-Yong 《理论物理通讯》2008,49(2):355-358
A scheme for approximately and conditionally teleporting an unknown atomic state in dissipative cavity QED is proposed. It is the extension of the scheme of [Phys. Rev. A 69 (2004) 064302], where the cavity mode decay has not been considered and only a time point of system evolution and the corresponding fidelity implementing the teleportation are given. In fact, the cavity mode decay exists really and must be delt with. In this paper, we investigate the influence from the cavity mode decay on the implementation of the approximate and conditional teleportation by means of the dissipative Jaynes Cummings model and then show the analytical expression of the fidelity of realization of the teleportation. Alternatively, our scheme does not involve an additional atom, only requiring two atoms and one single-mode cavity. 相似文献
16.
WU Tao NI Zhi-Xiang YE Liu 《理论物理通讯》2007,48(5):831-833
We present a scheme for transferring an unknown atomic entangled state with a single resonant interaction. This scheme only requires a single resonant interaction of two atoms with a cavity mode and does not use the cavity mode as the memory. Thus the scheme is very simple and the interaction time is very short, which is important, in view of decoherence. Quantum state can be directly transferred from two atoms to another two at, oms with a successful probability of 100 percent. 相似文献
17.
Generation of multi-atom cluster states via an unconventional geometric phase shift in cavity QED
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This paper proposes two schemes to generate the multi-atom cluster states. The
first scheme is based on the interaction of atoms with a highly
detuned cavity mode and a classical field, the second scheme is
based on the interaction of atoms with a cavity mode, strongly
driven by a resonant classical field. 相似文献
18.
19.
本文提出一个通过原子和腔场相互作用传送未知原子纠缠态的新方案,并且成功概率为100%.在这个方案里,我们主要利用两个原子用来接受被传送的原子纠缠态以及一个双模腔作为量子通道.由于腔场的两个模具有不同的频率和正交极化,因此这两个模能够被区分,并且处于腔场的不同区域.原子和腔场通过J-C哈密顿量发生共振相互作用,当原子和其中一个模相互作用时,另外一个模不受影响.该方案既不需要贝尔态测量,也不需要任何操作重构纠缠初态.这个方案也可以推广到传送N个原子的纠缠态. 相似文献
20.
ZHENG Shi-Biao 《理论物理通讯》2007,47(3):555-556
A scheme is presented for generating entangled states for two three-level atoms in a cavity. In the scheme two atoms simultaneously interact with a cavity mode with a small detuning. Thus, the operation time is very short, which is important in view of decoherence. 相似文献