Quantum Computation Using Artificial Molecules

Jacob M. Taylor

Masahiro Kitagawa

Wu, N J, Kamada, M, Natori, A +1 more

We propose a method for implementation of a quantum computer using artificial molecules. The artificial molecule consists of two coupled quantum dots stacked along z direction and one single electron. One-qubit and two-qubit gates are constructed by one molecule and two coupled molecules, respectively.The ground state and the first excited state of the molecule are used to encode the |0> and |1> states of a qubit. The qubit is manipulated by a resonant electromagnetic wave that is applied directly to the qubit through a microstrip line. The coupling between two qubits in a quantum controlled NOT gate is switched on (off) by floating (grounding) the metal film electrodes. We study the operations of the gates by using a box-shaped quantum dot model and numerically solving a time-dependent Schridinger equation, and demonstrate that the quantum gates can perform the quantum computation. The operating speed of the gates is about one operation per 4ps. The reading operation of the output of the quantum computer can be performed by detecting the polarization of the qubits.

Neil Gershenfeld, Isaac L. Chuang

Nan-Jian Wu, Masurao Kamada, Akiko Natori +1 more

We propose a method for implementing a quantum computer using artificial molecules. The artificial molecule consists of two coupled quantum dots stacked along the z direction and one single electron. One-qubit and two-qubit gates are constructed by one molecule and two coupled molecules, respectively. The ground state and the first excited state of the molecule are used to encode the |0> and |1> states of a qubit. The qubit is manipulated by a resonant electromagnetic wave that is applied directly to the qubit through a microstrip line. The coupling between two qubits in a quantum-controlled NOT gate is switched on (off) by floating (grounding) the metal film electrodes. We study the operations of the gates using a box-shaped quantum dot model and numerically solving a time-dependent Schrödinger equation, and demonstrate that the quantum gates can perform quantum computations. The operating speed of the gates is about one operation per 4 ps. The reading operation of the output of the quantum computer can be performed by detecting the polarization of the qubits.

Martin Philip

The electronic characteristics of molecules and molecular wave functions can be predicted using artificial intelligence. A team of researchers from the University of Warwick, the Technical University of Berlin, and the University of Luxembourg discovered a novel AI technology that might be used to speed up the design of medicinal compounds or new materials. Artificial intelligence and machine learning algorithms are frequently employed to forecast our buying habits and recognize our faces or handwriting. Artificial Intelligence is establishing itself as a critical instrument for scientific discoveries in scientific study. In chemistry, artificial intelligence has proven to be useful in predicting the results of experiments or simulations of quantum systems. To accomplish this, AI must be able to incorporate the fundamental rules of physics in a systematic manner. Quantum computing is a new type of computing that is based on quantum mechanics. It carries out computations using quantum units under control. Quantum computers can only address problems that traditional computers can solve in terms of computable problems, but in terms of computing efficiency, some known quantum algorithms are tenfold quicker than traditional general-purpose computers due to the existence of quantum superposition.