共查询到20条相似文献,搜索用时 46 毫秒
1.
Yuan-hua Li Xiao-lan Li Yi-you Nie 《International Journal of Theoretical Physics》2013,52(7):2395-2399
We present an experimentally feasible protocol for implementing controlled dense coding by using a three-atom GHZ-type state in cavity quantum electrodynamics (QED). In cavity QED system, we have proposed to generate a three-atom GHZ-type state and demonstrated that the probability of implementing controlled dense coding is 100 %. In addition, our approach can be realized with present cavity QED techniques. 相似文献
2.
Yu-chi Zhang Gang Li Peng-fei Zhang Jun-min Wang Tian-cai Zhang 《Frontiers of Physics in China》2009,4(2):190-197
Cavity QED, as a fundamental system and research field, not only illuminates the primary aspects of decoherence and coherence
in quantum dynamics, but also advances quantum information science. Manipulation of single atoms, in the context of cavity
QED, is the essential element and has been becoming a hot issue for the past two decades. In this review paper, we will concentrate
on the experimental aspects for manipulating the neutral atoms strongly coupled to a high-finesse cavity in the optical regime,
including atomic cooling and trapping, different configurations of atom transportation and the wide variety of quantum outgrowths
based on cavity QED, such as one atom laser, single photon source, etc. The cavity QED system at Shanxi University is briefly
introduced.
相似文献
3.
Large payload quantum steganography based on cavity quantum electrodynamics 总被引:1,自引:0,他引:1
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
A large payload quantum steganography protocol based on cavity quantum electrodynamics (QED) is presented in this paper, which effectively uses the evolutionary law of atoms in cavity QED. The protocol builds up a hidden channel to transmit secret messages using entanglement swapping between one GHZ state and one Bell state in cavity QED together with the Hadamard operation. The quantum steganography protocol is insensitive to cavity decay and the thermal field. The capacity, imperceptibility and security against eavesdropping are analyzed in detail in the protocol. It turns out that the protocol not only has good imperceptibility but also possesses good security against eavesdropping. In addition, its capacity for a hidden channel achieves five bits, larger than most of the previous quantum steganography protocols. 相似文献
4.
5.
A quantum logic network is constructed to simulate a cloning machine which copies states near a given one. Meanwhile, a scheme for implementing this cloning network based on the technique of cavity quantum electrodynamics (QED) is presented. It is easy to implement this network of cloning machine in the framework of cavity QED and feasible in the experiment. 相似文献
6.
Fink JM Steffen L Studer P Bishop LS Baur M Bianchetti R Bozyigit D Lang C Filipp S Leek PJ Wallraff A 《Physical review letters》2010,105(16):163601
The quantum properties of electromagnetic, mechanical or other harmonic oscillators can be revealed by investigating their strong coherent coupling to a single quantum two level system in an approach known as cavity quantum electrodynamics (QED). At temperatures much lower than the characteristic energy level spacing the observation of vacuum Rabi oscillations or mode splittings with one or a few quanta asserts the quantum nature of the oscillator. Here, we study how the classical response of a cavity QED system emerges from the quantum one when its thermal occupation-or effective temperature-is raised gradually over 5 orders of magnitude. In this way we explore in detail the continuous quantum-to-classical crossover and demonstrate how to extract effective cavity field temperatures from both spectroscopic and time-resolved vacuum Rabi measurements. 相似文献
7.
In this paper, we propose a scheme for the teleportation of general two-partite entangled state of zero and one photon state from one bimodal cavity to another. The scheme can be realized by using cavity quantum electrodynamics (QED). 相似文献
8.
Following the theoretical protocol described by Fortescue and Lo [Fortescue B and Lo H K 2007 Phys. Rev. Lett. 98 2605011, we present a scheme in which one can distill maximally entangled bi-partite states from a tri-partite W state with cavity QED. Our scheme enables the concrete physical system to realize its protocol. In our scheme, the rate distillation also asymptotically approaches one. Based on the present cavity QED techniques, we discuss the experimental feasibility. 相似文献
9.
We propose a scheme for generating maximally GHZ state for four atoms trapped in a two-mode optical cavity via combination of cavity QED and linear optics system. The GHZ state can be not only generated deterministically with a single resonant interaction in cavity QED, but also can be prepared probabilistically based on cavity QED and linear optics elements. The fidelity of the entangled states is not affected by the atomic spontaneous, cavity decay, and imperfection of the photon-detectors. Finally, we briefly analyze and discuss the experimental feasibility of the proposed scheme. 相似文献
10.
In this paper, a scheme is proposed for remote state preparation (RSP) with cavity quantum electrodynamics (QED). In our scheme, two observers share two-atom nonmaximally entangled state as quantum channels and can realize remote preparation of state of an atom. We also propose a generalization for remote preparation of N-atom entangled state by (N+1)-atom GHZ-like state (N ≥ 2). By this scheme, one single-atom projective measurement is enough for the RSP of a qubit or N-atom entangled state, and the probability of success for RSP is unity. Furthermore, we have considered the case where observers use W-like state as quantum channels to realize RSP of a qubit. We compare our scheme with existing ones. 相似文献
11.
12.
We propose an experimentally feasible protocol for implementing controlled dense coding with a six-atom cluster state in cavity QED. In the scheme, we investigate that the atoms interact simultaneously with the highly detuned single-mode cavity and the strong classical driving field, and thus our scheme is not sensitive to both the cavity decay and the thermal field. In addition, the four-atom entangled states can be exactly distinguished by performing the single-atom measurements in cavity QED, therefore our scheme might be implemented in a simple way. 相似文献
13.
Probabilistic teleportation of an unknown N-atom state using a two-atom nonmaximally entangled state in cavity QED 总被引:1,自引:0,他引:1
下载免费PDF全文
![点击此处可从《中国物理》网站下载免费的PDF全文](/ch/ext_images/free.gif)
We present a scheme for realizing probabilistic teleportation of an unknown N-atom state via cavity QED. This scheme requires only a nonmaximally entangled pair to be used as a quantum channel, so the requirement of entanglement is reduced. In addition, our scheme does not involve the Bell-state measurement and is insensitive to the cavity decay, which is important from the experimental point of view. If the quantum channel is a two-atom maximally entangled state, teleportation of an unknown N-atom state can be realized by a simpler scheme via cavity QED. 相似文献
14.
探讨了阶梯形三能级原子 腔耦合系统中由绝热跟随技术引起的光子Fock态的产生 .结果发现 :对于单模腔QED系统 ,通过受激拉曼绝热跟随技术 ,在微波区域内可实现单光子Fock态的制备 ;对于双模腔QED系统 ,通过斯塔克移动的快绝热跟随技术可实现双光子对Fock态的产生.The behavior of an atom-cavity system using a three-level ladder atom was investigated. It is found that, for one-mode cavity QED, a single photon can be generated via the technique of stimulated Raman adiabatic passage; for two-mode cavity QED, a two-photon pair can be generated via Stark-shift rapid adiabatic passage. 相似文献
15.
We propose an experimentally feasible scheme of implementing perfect quantum dense coding with three-atom W-class state in cavity QED. In this scheme atoms interact simultaneously with a highly detuned cavity field and the cavity is only virtually excited, thus the scheme is insensitive to the cavity decay, which is very important in view of experiment. Moreover, we also propose a scheme of transmitting three bits of classical information by sending one qubit and one classical bit with 3-qubit W-class and GHZ states. 相似文献
16.
利用腔QED技术,我们在本文提出了两个物理方案用来实现最简单版本的Deutsch-Jozsa(D-J)量子算法.第一个方案是比较理想的方案,这个方案可以推广到多个量子比特输入的Deutsch-Jozsa量子算法.我们只需要通过实现控制-非门和一系列单个量子比特操作,就可以简单的实现该方案.我们在这个方案中详细地讨论了基于腔QED技术最简单版本的Deutsch-Jozsa量子算法的实现过程.另一个方案是不需要控制-非门的更简单的方案,但是这个方案仅仅适用于实现这种最简单版本的Deutsch-Jozsa量子算法,这个方案只需要实现单个量子比特操作即可.显然,该方案比第一个方案更简化.我们的这两个方案可能是实现量子计算机的一个重要环节. 相似文献
17.
ZHENG Shi-Biao 《理论物理通讯》2006,45(3):539-541
A scheme is proposed for generating maximally entangled states for two or
more three-level atoms. In the scheme the atoms are sent through a two-mode
cavity one by one and interact with the two-cavity modes sequentially. The
required experimental techniques are within the scope of what can be
obtained in the microwave cavity QED setup. 相似文献
18.
《Physics letters. A》1998,244(6):512-516
We propose a cavity QED technique to generate superpositions of a series of coherent states on a circle through the interaction of the cavity field with only one atom driven by a classical field. 相似文献
19.
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
20.
CAO Shu-Ai FANG Mao-Fa ZHENG Xiao-Juan WANG Xin-Wen LI Ze-Hua 《理论物理通讯》2008,49(1):100-102
We propose an experimentally feasible scheme to implement two-player quantum game in cavity quantum electrodynamics (QED). During the process, the cavity is only virtually excited, thus our scheme is insensitive to the cavity field states and cavity decay. The scheme can be realized in the range of current cavity QED techniques. 相似文献