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理论物理通讯：英文版

Splitting Unknown Qutrit or Ququart States via Two-Qubit Partially Entangled States Channel

章文, 熊狂炜, 左学勤, 张子云

Published Jan 1, 2013• 0 citations
OpenAlex

Abstract

在这，我们建议二个量信息切开的纸(QIS ) 为经由部分纠缠的三 two-qubit 切开一个未知 single-qutrit 和 single-ququart 状态分别地策划状态。必要大小和操作详细地被给，成功可能性被得出。二个计划能被使用钟状态隧道直接概括到 multi-qutrit 和 multi-ququart 状态的 QIS。

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理论物理通讯：英文版•Jan 1, 2011•2 citations
在这，我们建议二个量信息切开的纸(QIS ) 为经由部分纠缠的三 two-qubit 切开一个未知 single-qutrit 和 single-ququart 状态分别地策划状态。必要大小和操作详细地被给，成功可能性被得出。二个计划能被使用钟状态隧道直接概括到 multi-qutrit 和 multi-ququart 状态的 QIS。
We study multi-qudit states for single-shot detection limits of quantum illumination under white noise environment. We show that the optimal state is not a maximally entangled multipartite state but a combination of a maximally entangled bipartite state, since entanglement between signal states degrades the performance. The behaviors are obtained in the cases of three-qubit, three-qutrit, four-qubit, and four-ququart states, where the multi-qudit states can outperform the two-qubit entangled states. Moreover, we find that quantum correlation of the multi-qudit states can explain the quantum advantage over the two-qubit entangled states, but it is not valid for four-ququart states.
我们在场为在一个网络经由许多代理人的控制从一个发送者移植 multi-qutrit 量信息到接收装置的电视的一个计划。代理人的控制参数经由量纠纷交换被获得。在我们的计划，张和人是 QSS 协议[Phys。加快。一 72 (2005 ) 022303 ] 基于钟状态，纠纷交换被概括到一个 qutrit 盒子。我们的计划拥有比工作有更高的代码能力和更好的安全的优点[Commun。Theor。Phys。44 (2005 ) 847 ] 在为 multi-qubit 的控制远距传物上。
We investigate, in a general form, entanglement of biphoton qutrits and ququarts, i.e. states formed in the processes of, correspondingly, degenerate and non-degenerate spontaneous parametric down-conversion. Indistinguishability of photons and, for ququarts, joint presence of the frequency and polarization entanglement are fully taken into account. In the case of qutrits, the most general three-parametric families of maximally entangled and non-entangled states are found, and anticorrelation of the degree of entanglement and polarization is shown to occur and to be characterized by a rather simple formula. Biphoton ququarts are shown to be two-qudits with the single-photon Hilbert space dimensionality d =4, which differentiates them significantly from the often used two-qubit model ( d =2). New expressions for entanglement quantifiers of biphoton ququarts are derived and discussed. Rather simple procedures for a direct measurement of the degree of entanglement are described for both qutrits and ququarts.
簇状态的新应用为一个任意的 three-qubit 状态的切开的量信息(QIS ) 被调查。在我们的计划，一个 four-qubit 簇状态和一个贝尔状态被一个发送者(艾莉斯) 分享，一个控制器(查理) ，和接收装置(鲍勃) 。发送者和控制器仅仅需要执行钟状态大小(BSM ) ，接收装置能重建由在他知道发送者和控制器的测量结果以后，在他的 qubits 上执行一些适当地单一的转变州的任意的 three-qubit。这个 QIS 计划是确定的。