共查询到20条相似文献,搜索用时 686 毫秒
1.
A scheme is proposed for generating three-dimensional maximally entangled states for two atoms. In the scheme the atoms are trapped in a two-mode cavity. The scheme only requires a single resonant interaction of the atoms with the cavity modes. Therefore, the scheme is very simple and required interaction time is very short, which is important in view of decoherence. 相似文献
2.
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
3.
Chui-Ping Yang 《Physics letters. A》2008,372(18):3168-3175
We propose a new scheme for realizing a distant two-qubit controlled-U gate with nearest qubit-qubit interaction. The present scheme does not need measurement. Furthermore, it is noted that the two-qubit CNOT gates required by the scheme are greatly reduced when compared with the conventional method based on SWAP operations. The scheme is useful in quantum computing with solid-state systems where only interaction between nearest systems is available. 相似文献
4.
Generation of entangled coherent states for two cavity modes via resonant interaction with a V-type three-level atom
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This paper proposes a scheme for the generation of entangled coherent states for two cavity modes. In the scheme a V-type three-level atom is sent through a two-mode cavity filled with a coherent field. After the atom cavity interaction and detection of the atomic state the cavity modes may evolve to a superposition of two-mode coherent states. As the scheme is based on resonant atom-cavity interaction, the required interaction time is short, which is important in view of the decoherence. Moreover, additional classical pulses are unnecessary before and after the atom-cavlty interaction. 相似文献
5.
We propose a scheme for implementing the Grover search algorithm
with two superconducting quantum interference devices (SQUIDs) in a
cavity. Our scheme only requires single resonant interaction of the
SQUID-cavity system and the required interaction time is very short.
The simplicity of the process and the reduction of the interaction
time are important for restraining decoherence. 相似文献
6.
文章提出一个在高品质腔中利用选择性相互作用制备Bell态和W态的方案。该方案通过参数的选择来严格控制囚禁原子和腔场之间的相互作用,在所需要的子空间里实现共振跃迁,而让原子的其它跃迁处于大失谐,从而可以绝热去除。因此,本方案可以有效抑制原子的自发辐射,而且不需要对腔中原子独立寻址,使其在实验上更容易实现。 相似文献
7.
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
8.
We present a scheme to entangle fields in multiple cavities. Our scheme is based on the resonant interaction of a Ξ-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. 相似文献
9.
We put forward a scheme for preparation of an entangled multiparty W state between different modes of radiation field inside high-Q cavity QED. Our scheme is based on the interaction of a two-level atom with the cavity field with the assistance of a strong classical driving field for precalculated interaction time. In principle, the scheme can be extended to prepare an N-party W state. The required experimental techniques are within the scope of what can be obtained in the microwave cavity QED setup. 相似文献
10.
WU Huai-Zhi YANG Zhen-Biao SU Wan-Jun ZHONG Zhi-Rong HUANG Jian-Min 《理论物理通讯》2008,49(5):1165-1168
We propose two schemes for quantum information splitting via W-class state. The first scheme is based on the interaction of single atom with single-mode field, while the second scheme is based on the simultaneous interaction of two atoms with single-mode cavity. For the first scheme, the difIiculty of two atoms required to be simultaneously sent through one cavity is avoid. For the second scheme, it is immune to thermal field. Both schemes are experimentally feasible based on current cavity QED techniques. 相似文献
11.
YANG Zhen-Biao 《理论物理通讯》2006,46(11)
An alternative scheme is proposed for preparing the superpositions of coherent states with controllable weighting factors along a straight line for a cavity field. The scheme is based on the interaction of a single-mode cavity field with a resonant two-level atom driven by a strong classical field. It is in contrast to the previous methods used in cavity QED of injecting a coherent state into a cavity via a microwave source. In the scheme, the interaction between the cavity mode and atoms is fully resonant, thus the required interaction time is greatly shortened. Moreover, the present scheme requires smaller numbers of operations. In view of decoherence, a reduction of interaction time and numbers of operations for the state preparation is very important for experimental implementation of quantum state engineering. 相似文献
12.
Approximate and Conditional Teleportation of an Unknown Atomic State Without Bell-State Measurement with Two-Photon Interaction 总被引:1,自引:0,他引:1
CHEN Chang-Yong 《理论物理通讯》2006,45(1):79-82
A scheme for approximately and conditionally teleporting an unknown atomic state via two-photon interaction in cavity QED is proposed. It is the
extension of the scheme of Ref. [11] [Phys. Rev. A 69 (2004) 064302],
which is based on Jaynes-Cummings model in QED and where only a time point of
system evolution and the corresponding fidelity implementing the teleportation
are given. In our scheme, the two-photon interaction Jaynes-Cummings model is used to realize the approximate and conditional teleportation. Our scheme does
not involve the Bell-state measurement and an additional atom, only requiring
two atoms and one single-mode cavity. The fidelity of the scheme is higher
than that of Ref. [11]. 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
13.
Two simple schemes for implementing Toffoli gate via atom--cavity field interaction in cavity quantum electrodynamics
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This paper proposes two schemes for implementing three-qubit Toffoli
gate with an atom (as target qubit) sent through a two-mode cavity
(as control qubits). The first scheme is based on the large-detuning
atom--cavity field interaction and the second scheme is based on the
resonant atom-field interaction. Both the situations with and
without cavity decay and atomic spontaneous emission are considered.
The advantages and the experimental feasibility of these two schemes
are discussed. 相似文献
14.
采用高精度格式求解二维Navier-Stokes方程研究超声速射流与同向超声速后台阶流动相互作用的流场基本结构及规律,分别应用5阶WENO格式、6阶中心差分格式离散对流项和黏性项,时间推进采用3阶Runge-Kutta格式,并应用消息传递接口(message passing interface,MPI)非阻塞式通信实现并行化.分别研究了超声速后台阶流动、超声速射流的基本结构特征,以此讨论和分析超声速后台阶流动/射流相互作用的特征,以及不同来流条件对波系结构、涡结构、剪切层、膨胀扇等的影响,尤其是来流剪切层和射流剪切层的相互作用,形成复杂的波系结构及相互干扰的流动现象. 相似文献
15.
YANG Zhen-Biao 《理论物理通讯》2006,46(5):919-922
An alternative scheme is proposed for preparing the superpositions of coherent states with controllable weighting factors along a straight line for a cavity field. The scheme is based on the interaction of a single-mode cavity field with a resonant two-level atom driven by a strong classical field. It is in contrast to the previous methods used in cavity QED of injecting a coherent state into a cavity via a microwave source. In the scheme, the interaction between the cavity mode and atoms is fully resonant, thus the required interaction time is greatly shortened. Moreover, the present scheme requires smaller numbers of operations. In view of decoherence, a reduction of interaction time and numbers of operations for the state preparation is very important for experimental implementation of quantum state engineering. 相似文献
16.
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
17.
Teleportation of two-atom entangled state in resonant cavity quantum electrodynamics 总被引:4,自引:0,他引:4
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An alternative scheme is presented for teleportation of a two-atom
entangled state in cavity quantum electrodynamics (QED). It is based
on the resonant atom--cavity field interaction. In the scheme, only
one cavity is involved, and the number of the atoms needed to be
detected is decreased compared with the previous scheme. Since the
resonant atom--cavity field interaction greatly reduces the
interaction time, the decoherence effect can be effectively
suppressed during the teleportation process. The experimental
feasibility of the scheme is discussed. The scheme can easily be
generalized to the teleportation of N-atom
Greeninger--Horne--Zeilinger (GHZ) entangled states. The number of
atoms needed to be detected does not increase as the number of the
atoms in the GHZ state increases. 相似文献
18.
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
19.
A robust scheme is presented for realizing entangled states for two atoms trapped in separate cavities connected by an optical fiber. The first atom is initially in a superposition of the excited state and an auxiliary ground state not coupled to the first cavity, while the second one is initially in the ground state coupled to the second cavity. The scheme involves two atom-cavity-fiber interactions accompanied by the monitoring of the cavity decay and atomic spontaneous emission. The two atoms evolve to an entangled state through exchanging an excitation after the first interaction. The states with the excitation failing to be transferred are eliminated when a photon is detected during the second interaction. Therefore, the scheme is insensitive to the decoherence effect and detection inefficiency. 相似文献
20.
This paper proposes an alternative scheme for generating four-photon W state via cavity QED. The scheme bases on the resonant interaction of a A-type three level atom with two bimodal cavities. The detection of atom collapses the cavity to the desired state. Comparing with previous schemes, the advantage of this scheme is that the interaction time can be greatly shortened since it uses the resonant interaction between atom and cavities. Moreover, the proposed scheme is more experimentally feasible than the previous ones. 相似文献