Theory of Fast Optical Spin Rotation in a Quantum Dot Based on Geometric Phases and Trapped States

2007/03/03 by Sophia E. Economou, T. L. Reinecke · 3 citations
Physics and Astronomy · #Quantum and electron transport phenomena #Quantum optics and atomic interactions #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevlett.99.217401

arxiv created 2007/03/03 · openalex publication_date 2007/11/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

A method is proposed for the optical rotation of the spin of an electron in a quantum dot using excited trion states to implement operations significantly faster than those of most existing proposals. Key ingredients are the geometric phase induced by 2pi hyperbolic secant pulses, use of coherently trapped states and use of naturally dark states. Our proposal covers a variety of quantum dots by addressing different parameter regimes. Numerical simulations with typical parameters for InAs self-assembled quantum dots, including their dissipative dynamics, give fidelities of the operations in excess of 99%.

Citations

• Stimulated and Spontaneous Optical Generation of Electron Spin Coherence in Charged GaAs Quantum Dots
• The Physical Implementation of Quantum Computation
• Fidelity of single qubit maps

Cited by

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• Fast two-qubit gates for quantum computing in semiconductor quantum dots using a photonic microcavity
• Quantum computing by optical control of electron spins