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fficient Scheme for Implementing a Fredkin Gate via Resonant Interaction with Two-Mode Cavity Quantum Electrodynamics 总被引:1,自引:0,他引:1 下载免费PDF全文
A scheme for implementing a Fredkin gate with an atom sent through a microwave cavity is proposed. The scheme is based on the resonant atom-cavity interaction so that the gating time is sharply short, which is important in view of decoherence. 相似文献
3.
Hong-Fu Wang Shou Zhang Yong-Fang Zhao Kyu-Hwang Yeon 《International Journal of Theoretical Physics》2009,48(11):3262-3267
We propose a quantum mechanical algorithm for solving quadratic residue equation z
2=b (mod M) based on Grover quantum search. The quantum algorithm will take O(
?M\sqrt{M}
) steps for finding the solutions to the equation by exploiting the properties of quantum superposition and interference effect,
while classical algorithm to the same problem will take O(M) steps. The success probability of the algorithm approaches to unity and the cost of the algorithm mainly depends on the
calculations of quadratic residue modulo M and the number of iterations. Furthermore, we show that the algorithm can be used to solve the prime factorization problem,
and the computing complexity is O(
?N\sqrt{N}
). 相似文献
4.
Considering the spin degree of freedom of the Dirac field, we study the entanglement behavior of a different class of communication channel and teleportation of three-dimensional single particle state in noninertial frames. Numerical analysis shows that the communication channel in our scheme can offer enough distillable entanglement for the teleportation protocol. Moreover, the teleportation protocol could work well if Rob's acceleration is not very big, but the fidelity of the teleportation is still reduced due to the Unruh effect. 相似文献
5.
The phase properties of the superposed squeezed states are studied. The superposed squeezed states are obtained by inserting
two squeezers in a Mach-Zehnder interferometer one for each arm. The visibility of the states as a measure of the coherence
of the generated photons in the nonlinear interferometer is analyzed. And the mean-square phase fluctuations are also considered
to analyze the phase properties of the superposed squeezed states. The quantities are obtained as a function of gain and the
input phase, when the amplified input is a coherent state, a number state, a thermal state, a displaced number state, or a
coherent thermal state. 相似文献
6.
Hong-Fu Wang Shou Zhang Kyu-Hwang Yeon 《International Journal of Theoretical Physics》2010,49(11):2723-2733
We propose a scheme to implement a two-bit conditional quantum phase gate and generate a multi-atom cluster state and a two-atom
three-dimensional entangled state based on photon emission and absorption processes. In the scheme, a Λ-type atom and a V-type atom are individually trapped in two spatially separated cavities connected by an optical fiber. By choosing the interaction
time and the ratio of coupling parameters appropriately, the gate operation and entanglement generation can be determinately
achieved. We also discuss the influence of photon Leakage on the fidelities of the gate and entanglement and show that the
scheme is scalable and feasible in the experimental realization and further utilization. 相似文献
7.
Pairwise thermal entanglement in a three-qubit Heisenberg XX model with a nonuniform magnetic field and Dzyaloshinski-- Moriya interaction 下载免费PDF全文
Pairwise thermal entanglement in a three-qubit Heisenberg XX model is investigated when a nonuniform magnetic field and the Dzyaloshinski-Moriya interaction are included. We find that the nonuniform magnetic field and Dzyaloshinski-Moriya interaction are the more efficient control parameters for the increase of entanglement and critical temperature. For both the nearest neighbour sites and the next nearest neighbour sites, the magnetic field can induce entanglement to a certain extent and the Dzyaloshinski-Moriya interaction can enhance the entanglement to a stable value. The steady value of the nearest neighbour site entanglement C 12 is larger than the next nearest neighbour site entanglement C 13 . An interesting phenomenon is that the entanglement curve of C 12 appears a peak value when the Dzyaloshinski-Moriya interaction is considered in a nonuniform magnetic field. 相似文献
8.
Shi-Lei Su Long Zhu Qi Guo Hong-Fu Wang Ai-Dong Zhu Shou Zhang Kyu-Hwang Yeon 《Optics Communications》2012,285(20):4134-4139
We present a simplified symmetry analyzer (SA) with cross-Kerr nonlinearity, quantum non-demolition photon number measurement and basic optical elements. Based on the present symmetry analyzer (SA), all the Bell states can be discriminated nondestructively with nearly unity probability. In addition, with the help of cross-phase modulation (XPM) induced by giant cross-Kerr nonlinearity, three-photon Greenberger–Horne–Zeilinger (GHZ) state can also be discriminated determinately and nondestructively, which is supposed to be meaningful in quantum information processing. 相似文献
9.
We propose a multi-bit dense coding scheme by using only an Einstein-Podolsky-Rosen(EPR) channel and assistant qubits.It is shown that no matter how many classical bits there are,the quantum channel is always a Bell state.The present dense coding process can also prepare non-local multi-particle Greenberger-Horne-Zeilinger(GHZ) states at one of the participants.The quantum circuits for this dense coding process are constructed,the deterministic implementation method in an optical system based on the cross-Kerr nonlinearities is shown. 相似文献
10.
We present a scheme to prepare cluster-type entangled squeezed vacuum states (CTESVS) by considering the two-photon interaction between a two-level atom and a high-quality cavity, driven by a strong classical field. After the realization of simple atomic measurements, the generation of CTESVS in four separate cavities is accomplished within the cavity decay time. In the case of large atom=cavity detuning, the scheme is immune to the effect of atomic spontaneous emission. 相似文献