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11.
Teleportation of a two-atom entangled state using a single EPR pair in cavity QED 总被引:1,自引:0,他引:1
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We propose a scheme for teleporting a two-atom entangled state in
cavity quantum electrodynamics (QED). In the scheme, we choose a
single Einstein--Podolsky--Rosen (EPR) pair as the quantum channel which
is shared by the sender and the receiver. By using the atom--cavity-field
interaction and introducing an additional atom, we can teleport
the two-atom entangled state successfully with a probability of 1.0.
Moreover, we show that the scheme is insensitive to cavity decay
and thermal field. 相似文献
12.
Application of quantum algorithms to direct measurement of concurrence of a two-qubit pure state
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This paper proposes a method to measure directly the concurrence of an arbitrary two-qubit pure state based on a generalized Grover quantum iteration algorithm and a phase estimation algorithm. The concurrence can be calculated by applying quantum algorithms to two available copies of the bipartite system, and a final measurement on
the auxiliary working qubits gives a better estimation of the concurrence. This method opens new prospects of entanglement measure by the application of quantum algorithms. The implementation of the protocol would be an important step toward quantum information processing and more complex entanglement measure of the finite-dimensional quantum system with an arbitrary number of qubits. 相似文献
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合成联苯衍生物的改良方法 总被引:4,自引:0,他引:4
联苯衍生物可以通过Ullmann反应和Gomberg-Bachmann反应来合成。后者是芳香胺的重氮盐在苯中于低温经NaOH(NaOAc)分解来完成的,属于非均相反应,且重氮盐不稳定,故产率很低(15~35%)。Hey发展了该反应,将芳香胺转变为亚硝基乙酰芳胺后与苯加热即得目的物,收率提高至40~70%,但手续复杂。为了克服上述缺点,1962年,Cadogan将芳胺、苯、亚硝酸戊酯一起加热即得产物,产率较高(30~35%)。新近,又有人用芳胺的氟硼酸重氮盐在苯中分解偶联,而 相似文献
16.
本文研究了具有不同耦合系数的两个二能级原子与双模腔场相互作用系统中原子偶极振幅平方压缩随时间的演化规律.并讨论了两个原子与双模腔场的相对耦合常数(R=g1/g2)和腔场的初态对原子偶极振幅平方压缩的影响. 相似文献
17.
We study the effect of Kerr medium on the intrinsic decoherence of a system which consists of two two-level atoms and a optical cavity. The entanglement of the system is calculated by making use of concurrence. Our results show that the intrinsic decoherence is very sensitive to the nonlinear coupling constant of Kerr medium. Both the oscillation period and the amplitude of the concurrence increase with the increasing nonlinear coupling constant. 相似文献
18.
Implementation of n-qubit Deutsch--Jozsa algorithm using resonant interaction in cavity QED
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We propose a scheme to implement the n-qubit Deutsch--Jozsa
algorithm based on resonant interaction between the atoms and a
single-mode cavity. In the scheme, the resonant transitions between
two ground states and one excited state of an atom are changed
alternately by adjusting the cavity frequency appropriately, and the
operations required to complete the algorithm can be significantly
simplified following the increment of the number of qubits. The
implementation of the scheme in experiment would show the full power
of quantum algorithm and would be significative and important for
more complicated quantum algorithm in cavity quantum electrodynamics. 相似文献
19.
In this paper a quantum dialogue scheme is proposed by using N batches of single
photons. The same secret message is encoded on each batch of single photons by the
sender with two different unitary operations, and then the N batches of single
photons are sent to the receiver. After eavesdropping check, the message is encoded
on the one remaining batch by the receiver. It is shown that the
intercept-and-resend attack and coupling auxiliary modes attack can be resisted more
efficiently, because the photons are sent only once in our quantum dialogue scheme. 相似文献
20.
A scheme is proposed to generate an N-qubit cluster-type entangled squeezed vacuum state (CTESVS) based on the two-photon interaction between a two-level atomand the cavity fields with the cavity QED system. The CTESVS in N separate cavities can be effectively obtained after performing a simple one-qubit measurement on the atom. The influence of cavity decay on the CTESVS is also discussed. 相似文献