Spin echo of electron spins in semiconductors using ultrafast, small-angle, optical pulses

Susan M. Clark; Kai-Mei C. Fu; Qiang Zhang; Thaddeus D. Ladd; Colin R. Stanley; Yoshihisa Yamamoto

doi:10.1117/12.841210

15 February 2010 Spin echo of electron spins in semiconductors using ultrafast, small-angle, optical pulses

Susan M. Clark, Kai-Mei C. Fu, Qiang Zhang, Thaddeus D. Ladd, Colin R. Stanley, Yoshihisa Yamamoto

Proceedings Volume 7611, Advances in Photonics of Quantum Computing, Memory, and Communication III; 76110J (2010) https://doi.org/10.1117/12.841210
Event: SPIE OPTO, 2010, San Francisco, California, United States

Abstract

Spin-based quantum computing and magnetic resonance techniques rely on the ability to measure the coherence time, T₂, of a spin system. We report on the experimental implementation of all-optical spin echo to determine the T₂ time of a semiconductor electron-spin system. We use three ultrafast optical pulses to rotate spins an arbitrary angle and measure an echo signal as the time between pulses is lengthened. Unlike previous spin-echo techniques using microwaves, ultrafast optical pulses allow clean T₂ measurements of systems with dephasing times (T ^*₂ ) fast in comparison to the timescale for microwave control. We measure a 7 μs coherence time, which is similar to previous measurements in quantum dots and indicates that nuclear spin diffusion is the primary mechanism for decoherence. This demonstration is a critical step towards optical, dynamic decoupling, which can eliminate fast decoherence and can be integrated into quantum computer architectures based on opticallycontrolled spin qubits.

Citation Download Citation

Susan M. Clark, Kai-Mei C. Fu, Qiang Zhang, Thaddeus D. Ladd, Colin R. Stanley, and Yoshihisa Yamamoto "Spin echo of electron spins in semiconductors using ultrafast, small-angle, optical pulses", Proc. SPIE 7611, Advances in Photonics of Quantum Computing, Memory, and Communication III, 76110J (15 February 2010); https://doi.org/10.1117/12.841210

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