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理论物理通讯：英文版

Preparation of n-Atom GHZ State and Implementation of Quantum-State Transfer via Cavity Decay

Chen, Du, Qian-Hua, Lin Lin, Gong-Wei, Zhihua, Xiu-Min

Published Jan 1, 2008• 1 citation
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Abstract

我们建议准备 n 原子 Greenberger Horne Zeilinger (GHZ ) 的计划经由与单个光子的脉搏交往的两方面的洞说，并且从一个原子完成量状态转移(QST ) 到另一个原子。纠纷粒子对和在 qubits 之间联合的控制具有在 QST 进程的没有需要。一些实际的量噪音仅仅减少计划的成功可能性但是没在准备状态的忠实上有影响。另外，我们的计划的成功可能性在理想的盒子中接近统一。

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我们建议准备 n 原子 Greenberger Horne Zeilinger (GHZ ) 的计划经由与单个光子的脉搏交往的两方面的洞说，并且从一个原子完成量状态转移(QST ) 到另一个原子。纠纷粒子对和在 qubits 之间联合的控制具有在 QST 进程的没有需要。一些实际的量噪音仅仅减少计划的成功可能性但是没在准备状态的忠实上有影响。另外，我们的计划的成功可能性在理想的盒子中接近统一。
一个其他的计划为产生 theGreenberg-Horne-Zeilinger (GHZ ) 被建议， W 与多重 superconductingquantum 干扰纠缠的状态打字一块单个模式的微波洞地里的设备(枪乌) qubits。在这个计划，没有在枪乌和洞之间的量信息的转移，洞总是在真空，因此，洞的质量上的要求极大地被松开。另外，在 W 的产生的过程期间纠缠了状态，现在的方法不包含中间的层次的真实刺激。因此，由于精力，中介的松驰铺平的 decoherence 被最小化。
我们在场一个物理计划到电视港口经由洞腐烂的一个未知原子纠缠的状态。在远距传物过程，四粒子的 Greenberger—Horne—Zeilinger (GHZ ) 状态被用作量隧道，和二个未知纠缠的原子，处于 thefour-particJe GHZ 状态的四个原子中的二个分别地在四个漏的洞被套住。从四个洞外面基于光子漏缝的联合察觉，我们电视能与某些概率和高保真度移植一个未知纠缠的状态到二个另外的遥远的原子。
We propose schemes to prepare n-atom Greenberger–Horne–Zeilinger (GHZ) state via two-sided cavities interacting with single-photon pulses, and achieve quantum state transfer (QST) from one atom to another atom. Entanglement particle pair and the control of coupling between qubits are of no need in the QST process. Some practical quantum noises only decrease the success probabilities of the schemes but have no influence on the fidelity of prepared state. In addition, the success probabilities of our schemes are close to unity in the ideal case.
We show a way to use an optical device set-up to generate the four-particle Greenberger–Horne–Zeilinger (GHZ) state of atoms, which are trapped separately in leaky cavities. Based on cavity decay, photons are transferred from the atom–cavity systems to a symmetric series of beam splitters and photon detectors. The events of photon detection on the output modes of the beam splitters project the state of the atom–cavity systems onto the GHZ state. It is briefly pointed out how this scheme can be extended to generate GHZ states of 4 m atoms.