Multi-valued logic gates based on ballistic transport in quantum point contacts.
Multi-valued logic gates, which can handle quaternary numbers as inputs, are developed by exploiting the ballistic transport properties of quantum point contacts in series. The principle of a logic gate that finds the minimum of two quaternary number inputs is demonstrated. The device is scalable to allow multiple inputs, which makes it possible to find the minimum of multiple inputs in a single gate operation. Also, the principle of a half-adder for quaternary number inputs is demonstrated. First, an adder that adds up two quaternary numbers and outputs the sum of inputs is demonstrated. Second, a device to express the sum of the adder into two quaternary digits [Carry (first digit) and Sum (second digit)] is demonstrated. All the logic gates presented in this paper can in principle be extended to allow decimal number inputs with high quality QPCs.
Department of Physics, Pusan National University, Busan, 609-735, Republic of Korea.
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Seo
Department of Physics, Pusan National University, Busan, 609-735, Republic of Korea.
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Hong
1] Department of Physics, Pusan National University, Busan, 609-735, Republic of Korea [2] School of Electronics Engineering, Kyungpook National University, Daegu, 702-701, Republic of Korea.
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Lee
Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, 76100, Israel.
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Choi
Korea Research Institute of Standard and Science, Daejeon, 306-600, Republic of Korea.
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Kim
Department of Physics, Pusan National University, Busan, 609-735, Republic of Korea.
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Chung
Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, 76100, Israel.
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Umansky
Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, 76100, Israel.
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Mahalu