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Artificial Molecular Nanomagnets as Spin-Based Quantum Logic Gates

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Book cover Architecture and Design of Molecule Logic Gates and Atom Circuits

Part of the book series: Advances in Atom and Single Molecule Machines ((AASMM))

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Abstract

Quantum coherence and entanglement give resources to enhance the capabilities of computers well beyond those achievable by present-day or even future classical devices. Quantum information processing can be carried out via a combination of two elementary logic operations: unitary rotations of individual qubits and quantum-gate operations that involve at least two coupled qubits. An outstanding challenge for science and technology is to find suitable realizations of these basic elements. In recent years, magnetic molecular clusters have become candidates to implement the quantum computer hardware. Here, we summarize some of the strategies that have been followed to design and synthesize molecular spin qubits and quantum gates. In particular, we show that molecular clusters containing two Tb3+ ions meet all ingredients required to implement a CNOT quantum logic gate. The definition of control and target qubits is based on the strong magnetic anisotropy and the magnetic inequivalence of the two ions, which can be achieved by chemically engineering dissimilar coordination spheres. The magnetic asymmetry also provides a method to realize a SWAP gate in the same cluster. The synthesis of related molecular structures enables a vast choice of quantum-gate designs. Chemically engineered molecular quantum gates can therefore open promising avenues for the realization of scalable quantum computing architectures.

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Acknowledgements

This work was partly funded by grants MAT2009–13977-C03 (MOLCHIP), CTQ2009–06959, FIS2008–01240 and FIS2009–13364-C02, from the Spanish MICINN and the Consolider-Ingenio project on molecular nanoscience. Funding from the European Research Council Starting Grant FuncMolQIP (to GA) is also acknowledged. G. A. acknowledges Generalitat de Catalunya for the ICREA Academia prize 2008.

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Authors and Affiliations

  1. Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009, Zaragoza, Spain

    Fernando Luis & Olivier Roubeau

  2. Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 645, 08028, Barcelona, Spain

    Guillem Aromí

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  1. Fernando Luis
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  2. Olivier Roubeau
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  3. Guillem Aromí
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Correspondence to Fernando Luis .

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  1. CIN2 (CSIC-ICN), Campus de la UAB, Bellaterra, 08193, Spain

    Nicolas Lorente

  2. , GNS, CNRS, Rue J. Marvig 29, Toulousse Cedex, 31055, France

    Christian Joachim

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Luis, F., Roubeau, O., Aromí, G. (2013). Artificial Molecular Nanomagnets as Spin-Based Quantum Logic Gates. In: Lorente, N., Joachim, C. (eds) Architecture and Design of Molecule Logic Gates and Atom Circuits. Advances in Atom and Single Molecule Machines. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-33137-4_19

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