Computing with spins: from classical to quantum computing |
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| Institution: | 1. Mentor Graphics, Budapest, Hungary;2. Budapest University of Technology and Economics, Hungary;1. Department of Physical Electronics, School of Electrical Engineering, Faculty of Engineering, Tel Aviv University, Tel-Aviv 69978, Israel;2. School of Mechanical Engineering, Faculty of Engineering, Tel Aviv University, Tel-Aviv 69978, Israel;1. Sorbonne Universités, UPMC Univ Paris 06, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75231 Paris cedex 05, France;2. CNRS UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75231 Paris cedex 05, France;3. Institute of Precision Optical Engineering, Department of Physics, Tongji University, Shanghai 200092, China;4. Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 CNRS-Université De Strasbourg, 23 rue du Loess, 67034 Strasbourg, France;1. Electrical Engineering Department, President University, Jl. Ki Hajar Dewantara, Jababeka Education Park, Cikarang Bekasi, West-Java 17550, Indonesia;2. Electronic and Computer Engineering Department, National Taiwan University of Science and Technology (NTUST), Da-an District, Taipei City 10607, Taiwan |
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| Abstract: | This article reviews the use of single electron spins to compute. In classical computing schemes, a binary bit is represented by the bistable spin polarization of a single electron confined in a quantum dot and subjected to a weak magnetic field. The spin orientation can be either parallel or anti-parallel to the field, so that it becomes a binary variable which can encode logic 0 and logic 1. Coherent superposition of these two polarizations can represent a qubit for quantum computing. By engineering the exchange interaction between closely spaced spins in neighboring quantum dots, it is possible to implement either classical or quantum logic gates. |
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