aqora

Implementation of Quantum Controlled-NOT Gates Using Asymmetric Semiconductor Quantum Dots

Alexander A. Balandin, Kang L. Wang

Lecture notes in computer scienceJan 1, 19995 citations

Andreev Quantum Dots for Spin Manipulation

N. M. Chtchelkatchev, Yuli V. Nazarov

We investigate the feasibility of manipulating individual spin in a superconducting junction where Bogoliubov quasiparticles can be trapped in discrete Andreev levels. We call this system an Andreev quantum dot (AQD) to be contrasted with a common semiconductor quantum dot. We show that the AQD can be brought into a spin-1/2 state. The coupling between the spin and superconducting current facilitates manipulation and measurement of this state. We demonstrate that one can operate two inductively coupled AQDs as a XOR gate; this enables quantum computing applications.We investigate the feasibility of manipulating individual spin in a superconducting junction where Bogoliubov quasiparticles can be trapped in discrete Andreev levels. We call this system an Andreev quantum dot (AQD) to be contrasted with a common semiconductor quantum dot. We show that the AQD can be brought into a spin-1/2 state. The coupling between the spin and superconducting current facilitates manipulation and measurement of this state. We demonstrate that one can operate two inductively coupled AQDs as a XOR gate; this enables quantum computing applications.

arXiv:cond-mat/0207684Physical Review LettersJun 4, 2003177 citations

Application of Semiconductor Quantum Dots in Quantum Computing

Fabio Baruffa

Mar 31, 20110 citations

Quantum computation in semiconductor quantum dots of electron-spin asymmetric anisotropic exchange

Xiang Hao, Shiqun Zhu

The universal quantum computation is obtained when there exists asymmetric anisotropic exchange between electron spins in coupled semiconductor quantum dots. The asymmetric Heisenberg model can be transformed into the isotropic model through the control of two local unitary rotations for the realization of essential quantum gates. The rotations on each qubit are symmetrical and depend on the strength and orientation of asymmetric exchange. The implementation of the axially symmetric local magnetic fields can assist the construction of quantum logic gates in anisotropic coupled quantum dots. This proposal can efficiently use each physical electron spin as a logical qubit in the universal quantum computation.The universal quantum computation is obtained when there exists asymmetric anisotropic exchange between electron spins in coupled semiconductor quantum dots. The asymmetric Heisenberg model can be transformed into the isotropic model through the control of two local unitary rotations for the realization of essential quantum gates. The rotations on each qubit are symmetrical and depend on the strength and orientation of asymmetric exchange. The implementation of the axially symmetric local magnetic fields can assist the construction of quantum logic gates in anisotropic coupled quantum dots. This proposal can efficiently use each physical electron spin as a logical qubit in the universal quantum computation.

arXiv:0803.0766Physical Review AOct 30, 200711 citations

Quantum computation on gate-defined semiconductor quantum dots

Li, Hai-Ou, Yao +4 more

中国科学通报：英文版Jan 1, 20120 citations

Functional operations using a near-field optically coupled quantum-dot system

Suguru Sangu, Kiyoshi Kobayashi, Akira Shojiguchi +1 more

We investigate the population dynamics in a three quantum-dot system coupled via an optical near field, which consists of a coherent operation part and an output part. We analytically show that a resonance condition between the two parts depends on initial excitation in the coherent operation part. Using this feature, AND- and XOR-gate operations are demonstrated in the case of symmetrically arranged quantum dots. We also evaluate the effects of asymmetric arrangement on these operations, and show that the coherence plays an important role in an asymmetric system.We investigate the population dynamics in a three quantum-dot system coupled via an optical near field, which consists of a coherent operation part and an output part. We analytically show that a resonance condition between the two parts depends on initial excitation in the coherent operation part. Using this feature, AND- and XOR-gate operations are demonstrated in the case of symmetrically arranged quantum dots. We also evaluate the effects of asymmetric arrangement on these operations, and show that the coherence plays an important role in an asymmetric system.

IEEE Conference on Nanotechnology (IEEE NANO)Jan 23, 20040 citations

Feasibility study of the quantum XOR gate based on coupled asymmetric semiconductor quantum dots

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