Quantum computation in semiconductor quantum dots of electron-spin asymmetric anisotropic exchange
arXiv:0803.0766 · doi:10.1103/PhysRevA.76.044306
Abstract
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.
4 pages, 1 figure
References in corpus (20)
- Quantum Computation with Quantum Dots
- Elementary gates for quantum computation
- Driven coherent oscillations of a single electron spin in a quantum dot
- A Theory of Fault-Tolerant Quantum Computation
- Universal Quantum Computation with the Exchange Interaction
- Electron Spin Resonance Transistors for Quantum Computing in Silicon-Germanium Heterostructures
- Theory of Decoherence-Free Fault-Tolerant Universal Quantum Computation
- Universal quantum computation with spin-1/2 pairs and Heisenberg exchange
- Anisotropic exchange interaction of localized conduction-band electrons in semiconductor structures
- Dynamical spin-electric coupling in a quantum dot
- Cancellation of Spin-Orbit Effects in Quantum Gates Based on the Exchange Coupling in Quantum Dots
- Reducing Constraints on Quantum Computer Design by Encoded Selective Recoupling
- Anisotropic Spin Exchange in Pulsed Quantum Gates
- Universal Quantum Computation through Control of Spin-Orbit Coupling
- Symmetry of anisotropic exchange interactions in semiconductor nanostructures
- Spin-Orbit Coupling and Time-Reversal Symmetry in Quantum Gates
- Interplay between Zeeman Coupling and Swap Action in Spin-based Quantum Computer Models: Error Correction in Inhomogeneous Magnetic Fields
- Simple Pulses for Universal Quantum Computation with a Heisenberg ABAB Chain
- Universal Quantum Logic from Zeeman and Anisotropic Exchange Interactions
- Exact asymptotic form of the exchange interactions between shallow centers in doped semiconductors