Charge-to-spin conversion of electron entanglement states and spin-interaction-free solid-state quantum computation

Abstract

Without resorting to spin-spin coupling, we propose a scalable spin quantum computing scheme assisted with a semiconductor multiple-quantum-dot structure. The techniques of single electron transitions and the nanostructure of quantum-dot cellular automata (QCA) are used to generate charge entangled states of two electrons, which are then converted into spin entanglement states using single-spin rotations only. Deterministic two-qubit quantum gates are also manipulated using only single-spin rotations with the help of QCA. A single-shot readout of spin states can be carried out by coupling the multiple dot structure to a quantum point contact. As a result, deterministic spin-interaction-free quantum computing can be implemented in semiconductor nanostructure.

5 pages, 4 figures, the revised version of quant-ph/0502002 for publication in Phys. Rev. B (to be appear on the issue of Oct. 15, 2007)

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Cited by in corpus (7)

• Exact Master Equation and Non-Markovian Decoherence for Quantum Dot Quantum Computing
• Non-equilibrium theory of charge qubit decoherence in the quantum point contact measurement
• Manipulating quantum coherence of charge states in interacting double-dot Aharonov-Bohm interferometers
• Precision control of charge coherence in parallel double dot systems through spin-orbit interaction
• Spin flip locking by the tunneling and relaxation in a driven double quantum dot with spin-orbit coupling
• All-electric single electron spin-to-charge conversion
• Universal quantum computation with quantum-dot cellular automata in dephasing-free subspace