Molecular electron-spin quantum computers and quantum information processing: pulse-based electron magnetic resonance spin technology applied to matter spin-qubits
Molecular electron-spin quantum computers and quantum information processing: pulse-based electron magnetic resonance spin technology applied to matter spin-qubits
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DOI：
10.1039/b819556k
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发表时间：
2009-06
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通讯作者：
Kazunobu Sato;S. Nakazawa;R. Rahimi;T. Ise;Shinsuke Nishida;Tomohiro Yoshino;Nobuyuki Mori;K. Toyota;D. Shiomi;Y. Yakiyama;Y. Morita;M. Kitagawa;K. Nakasuji;M. Nakahara;H. Hara;Patrick Carl;P. Höfer;T. Takui
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文献类型：
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作者：
Kazunobu Sato;S. Nakazawa;R. Rahimi;T. Ise;Shinsuke Nishida;Tomohiro Yoshino;Nobuyuki Mori;K. Toyota;D. Shiomi;Y. Yakiyama;Y. Morita;M. Kitagawa;K. Nakasuji;M. Nakahara;H. Hara;Patrick Carl;P. Höfer;T. Takui
基于脉冲的电子-核和电子-电子双共振（ENDOR/ELDOR）技术已被应用于分子自旋，以实现固体中基于自旋量子比特的综电子量子计算机/计算（QC）和量子信息处理（QIP）。利用稳定的丙二基自由基等分子自旋和核自旋实体作为物质自旋量子比特，首次进行了基于脉冲内蕴的超密集编码（SDC） QC/QIP实验。本研究中用于量子门操作的自旋量子比特操作技术是基于时间比例相位增量（TPPI）技术，使我们能够区分基于自旋量子比特的纠缠态的相位。TPPI技术首先由Mehring等人（M. Mehring， J. Mende和W. Scherer, Phys）应用。启。（2003,90,153001），已经说明了电子和核自旋态之间的量子纠缠以及电子-核贝尔态之间的相互转换的建立。在QC/QIP实验中发现了电子自旋4π的相位周期性，首次从实验上明确地说明了电子自旋的性质。进行了三方质控实验，证明了可分离态的存在。此外，还介绍了新型电子自旋技术的发展，以操纵多电子自旋量子比特。在这项工作中，首次通过调用一种新的微波双相位旋转技术实现了用于QC/QIP的脉冲相干双ELDOR。因此，本文还讨论了相干-对偶ELDOR在分子电子自旋量子比特系统中的应用，重点是设计适合QC/QIP的分子双电子量子比特系统。g-和/或超精细a -张量工程方法为我们提供了两个和多个电子量子比特系统，这是实现基于物质自旋量子比特的QC/QIP的材料挑战。目标物质自旋量子位元可用于促进脉冲ELDOR技术实现的选择性共振微波激发。除了DiVincenzo的五个标准外，还描述了可扩展电子自旋-量子比特系统作为一维周期鲁棒自旋结构的一般要求。根据要求，提出了嵌入开壳金属阳离子的双链或三链螺旋体代替有机分子自旋量子比特。
Pulse-based Electron–Nuclear and ELectron–electron DOuble Resonance (ENDOR/ELDOR) techniques have been applied to molecular spins in order to implement ensemble electron spin-qubit based quantum computers/computing (QC) and quantum information processing (QIP) in the solid state. Pulsed ENDOR-based QC/QIP experiments for super dense coding (SDC) have for the first time been carried out by the use of molecular electron- and nuclear-spin entities such as the stable malonyl radical as matter spin-qubits. The spin-qubit manipulation technology for quantum gate operations in this work is based on the time-proportional-phase-increment (TPPI) technique, enabling us to distinguish between the phases of spin-qubit based entangled states. The TPPI technique, as firstly applied by Mehring et al. (M. Mehring, J. Mende and W. Scherer, Phys. Rev. Lett., 2003, 90, 153001), has illustrated the establishment of quantum entanglement between electron- and nuclear-spin states and mutual interconversion between the electron–nuclear Bell states. The electron-spin 4π-periodicity in phase shows up in the QC/QIP experiments, explicitly and experimentally illustrating the electron-spin spinor nature for the first time. Tripartite QC experiments have been made, showing the occurrence of separable states. Also, the development of novel electron-spin technology to manipulate multi-electron spin-qubits is described. In this work, the pulsed coherent-dual ELDOR for QC/QIP has for the first time been implemented by invoking a novel microwave dual phase-rotation technique. Thus, applications of the coherent-dual ELDOR to molecular electron spin-qubit systems are also discussed, emphasising designing the molecular two electron-qubit systems appropriate for QC/QIP. g- and/or hyperfine A-tensor engineering approaches give us the two- and multi-electron-qubit systems, which have been a materials challenge to implement matter spin-qubit based QC/QIP. The targeted matter spin-qubits can be used to facilitate selective resonant microwave excitations achieved by the pulsed ELDOR technique. In addition to DiVincenzo's five criteria, general requisites for scalable electron spin-qubit systems as 1D periodic robust spin structures are described. According to the requisites, double- or triple-stranded helicates embedding open-shell metal cations are proposed instead of organic molecular spin-qubits.