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901.
Liaqat Ali Murad Ahmad Rameez-ul-Islam Muhammad Imran Manzoor Ikram Iftikhar Ahmad 《Annalen der Physik》2024,536(4):2300277
The quantized momentum eigenstates of neutral atoms offer high resistance to decoherence and thus suggests a viable alternative for quantum informatics tasks including teleportation. In this work, a scheme is suggested to teleport an unknown superposition of two distinct external momentum states of a neutral atom onto the similar momentum states of a distant atom at the receiving end through the off-resonant atomic Bragg diffraction (ABD). In order to teleport this unknown state from the sender, that is, Alice, to the receiver, that is, Bob, a pre-existing entangled link formed through a high-Q cavity at Alice's end and momentum states of a neutral atom at the Bob's end are utilized. Further, while citing the realistic experimental parameters, it is demonstrated that the proposal can easily be implemented experimentally under the prevailing cavity-QED atom-field research scenario. The proposal is also generalized to cover the teleportation of the multipartite entangled momenta states and the case of multipartite GHZ entangled states is elucidated in details. However, the procedure is generic and can be extended to cover the teleportation schematics for any arbitrary atomic momenta states. 相似文献
902.
This article aims to review the developments, both theoretical and experimental, that have in the past decade laid the ground for a new approach to solid state quantum computing. Measurement‐based quantum computing (MBQC) requires neither direct interaction between qubits nor even what would be considered controlled generation of entanglement. Rather it can be achieved using entanglement that is generated probabilistically by the collapse of quantum states upon measurement. Single electronic spins in solids make suitable qubits for such an approach, offering long coherence times and well defined routes to optical measurement. We will review the theoretical basis of MBQC and experimental data for two frontrunner candidate qubits – nitrogen‐vacancy (NV) centres in diamond and semiconductor quantum dots – and discuss the prospects and challenges that lie ahead in realising MBQC in the solid state. 相似文献
903.
The multipartite entanglement transfer from continuous variable system to spin qubits is investigated. We select multi-mode coherent field as continuous variable field. It is found that the qubits can not gain tripartite entanglement for states of close to GHZ state from the multi-mode coherent field. Moreover, the ability of the qubits gain the tripartite entanglement for states close to W state and bipartite entanglement from the continuous variable system is depended on the phase of multi-mode coherent field. 相似文献
904.
We propose a scheme to generate a three-qubit three-level singlet state in cavity QED, by placing three Λ-type SQUIDs in a single mode cavity. In this scheme, we make use of the interaction between the SQUIDs and cavity filed, and the classical pulses. The cavity fields are in vacuum state during the whole operation processes of creating the entanglement, and there is no quantum information transformation between the SQUIDs and cavity fields. Because of the advantage of the SQUID-cavity system, the quality factor of the cavity is greatly relaxed. 相似文献
905.
Partial entropy change and entanglement in the mixed state for a Jaynes-Cummings model with Kerr medium
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By using the algebraic dynamical approach, an atom--field
bipartite system in mixed state is employed to investigate the
partial entropy change and the entanglement in a cavity filled with
Kerr medium. The effects of different nonlinear intensities are
studied. One can find that the Kerr nonlinearity can reduce the
fluctuation amplitudes of the partial entropy changes and the
entanglement of the two subsystems, and also influence their
periodic evolution. Meanwhile, increasing the Kerr nonlinear
strength can convert the anti-correlated behaviour of the partial
entropy change to the positively correlated behaviour. Furthermore,
the entanglement greatly depends on the temperature. When the
temperature or the nonlinear intensity increases to a certain value,
the entanglement can be suppressed greatly. 相似文献
906.
A protocol for quantum dialogue is proposed to exchange directly the communicator's secret messages by using a three-dimensional Bell state and a two-dimensional Bell state as quantum channel with quantum superdence coding, local collective unitary operations, and entanglement swapping. In this protocol, during the process of trans- mission of particles, the transmitted particles do not carry any secret messages and are transmitted only one time. The protocol has higher source capacity than protocols using symmetric two-dimensional states. The security is ensured by the unitary operations randomly performed on all checking groups before the particle sequence is transmitted and the application of entanglement swapping. 相似文献
907.
We propose to use a set of averaged entropies, the multiple entropymeasures (MEMS), to partially quantify quantum entanglement ofmultipartite quantum state. The MEMS is vector-like with m=[N/2]components: [S1, S2,..., Sm], and the $i$-th component Si is the geometric mean of i-qubits partial entropy of the system. The Si measures how strong an arbitrary i qubits from the system are correlated with the rest of the system. It satisfies the conditions for a good entanglement measure. We have analyzed the entanglement properties of the GHZ-state, the W-states, and cluster-states under MEMS. 相似文献
908.
Based on the ground states of the one-dimensional Lipkin-Meshkov-Glick model (LMGM), we show an all-versus-nothing proof of violation of local realism in this model. Moreover, the quantum entanglement swapping is also investigated in terms of the braiding transformations. 相似文献
909.
Considering two identical two-level atoms interacting with two mode thermalfield through a nondegerate two-photon process, we study the entanglement dynamics between two atoms when the atomic coherence exists. It shows that the entanglement is dependent on the initial atomic states, and is greatlyenhanced due to atomic coherence as compared with the case when the atomic coherence is ignored. The results also show that the entanglement can be controlled by changing the relative phases and the amplitudes of the polarized atoms. 相似文献
910.
The entanglement of two moving atoms interacting with a single-mode field via a three-photon process
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In this paper, the entanglement of two moving atoms
induced by a single-mode field via a three-photon process is
investigated. It is shown that the entanglement is dependent on the
category of the field, the average photon number N, the number p
of half-wave lengths of the field mode and the atomic initial state.
Also, the sudden death and the sudden birth of the entanglement are
detected in this model and the results show that the existence of the
sudden death and the sudden birth depends on the parameter and the
category of the mode field. In addition, the three-photon process is a higher
order nonlinear process. 相似文献