Optical Detection of Single-Electron Spin Decoherence in a Quantum Dot

Abstract

We propose a method based on optically detected magnetic resonance (ODMR) to measure the decoherence time $T_2$ of a single electron spin in a semiconductor quantum dot. The electron spin resonance (ESR) of a single excess electron on a quantum dot is probed by circularly polarized laser excitation. Due to Pauli blocking, optical excitation is only possible for one of the electron-spin states. The photoluminescence is modulated due to the ESR which enables the measurement of electron spin decoherence. We study different possible schemes for such an ODMR setup.

5 pages, 4 figures, v2: minor changes and added references

References in corpus (4)

• Spin-based all-optical quantum computation with quantum dots: understanding and suppressing decoherence
• Shell structure and electron-electron interaction in self-assembled InAs quantum dots
• Detection of Single Spin Decoherence in a Quantum Dot via Charge Currents
• Single Spin Dynamics and Decoherence in a Quantum Dot via Charge Transport

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• Active Control of Probability Amplitudes in a Mesoscale System via Feedback-Induced Suppression of Dissipation and Noise
• Controlling inelastic cotunneling through an interacting quantum dot by a circularly-polarized field