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Chinese Physics Letters

Implementing a Multi-Qubit Quantum Phase Gate Encoded by Photonic Qubit

陆培民, 宋杰, 夏岩

Published Jan 1, 2010• 0 citations
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Abstract

一个协议被建议在一个三模式的洞为 photonic qubits 实现一扇 three-qubit 阶段门。这个想法能被扩大直接实现一扇 N-qubit 阶段门。我们也证明相互作用时间与 qubits 的增加的数字仍然保持未改变。另外，洞腐烂的影响和门忠实和光子损失概率上的原子自发的排放被数字计算也讨论。

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Chinese Physics Letters•Jan 1, 2009•0 citations
一个协议被建议在一个三模式的洞为 photonic qubits 实现一扇 three-qubit 阶段门。这个想法能被扩大直接实现一扇 N-qubit 阶段门。我们也证明相互作用时间与 qubits 的增加的数字仍然保持未改变。另外，洞腐烂的影响和门忠实和光子损失概率上的原子自发的排放被数字计算也讨论。
在这份报纸， three-quhit 的合成和实现交换门被讨论。three-quhit 交换门能被分解成 2 two-qubit 的产品交换门，并且它能由 6 扇 CNOT 门被认识到。尽管结果很简单，研究说明了那，为 multi-qubit 门的矩阵分解的当前的方法不能得到那。然后 three-qubit 的实现与 Ising 在三个旋转系统交换门相互作用被调查，控制脉搏和飘移过程的顺序被给实现门。它需要 23 控制脉搏和 12 个飘移过程。因为相互作用不能随意断断续续地被交换， three-qubit 的实现也在特定的量系统交换门不能简单地下来到 2 two-qubit 交换门。
In recent years, quantum state engineering and quantum information processing using microwave fields and photons have received increasing attention. In addition, multiqubit gates play an important role in quantum information processing. In this work, we propose to encode a photonic qubit via two arbitrary orthogonal eigenstates (with eigenvalues $\ifmmode\pm\else\textpm\fi{}1$, respectively) of the photon-number parity operator. With such encoding, we then present a single-step method to realize a multi-target-qubit controlled-phase gate with one photonic qubit simultaneously controlling $n\ensuremath{-}1$ target photonic qubits, by employing nnn microwave cavities coupled to one superconducting flux qutrit. This proposal can be applied not only to implement nonhybrid multi-target-qubit controlled-phase gates using photonic qubits with various encodings, but also to realize hybrid multi-target-qubit controlled-phase gates using photonic qubits with different encodings. The gate realization requires only a single-step operation. The gate operation time does not increase with the number of target qubits. Because the qutrit remains in the ground state during the entire operation, decoherence from the qutrit is greatly suppressed. As an application, we show how to apply this gate to generate a multicavity Greenberger-Horne-Zeilinger (GHZ) entangled state with general expression. Depending on the specific encodings, we further discuss the preparation of several nonhybrid and hybrid GHZ entangled states of multiple cavities. We numerically investigate the circuit-QED experimental feasibility of creating a three-cavity spin-coherent hybrid GHZ state. This proposal can be extended to accomplish the same tasks in a wide range of physical systems, such as multiple microwave or optical cavities coupled to a three-level natural or artificial atom.
我们建议一个可伸缩的计划产生 multiqubit 由使用一块基本积木的有条件的阶段门，即，弱协调光脉搏 |α 〉与套住的原子从一个洞连续地思考了。在计划，我们使用光的一个协调状态而不是单个光子来源，一盏协调的灯上的人达因测量回答而不是单个光子察觉，它减少实际实验的复杂性。这些大小的结果显示门的任何一个结束或原来的 qubits 的存在以便操作能被重复直到它是成功的。