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Proceedings Paper

Spin echo of electron spins in semiconductors using ultrafast, small-angle, optical pulses
Author(s): Susan M. Clark; Kai-Mei C. Fu; Qiang Zhang; Thaddeus D. Ladd; Colin R. Stanley; Yoshihisa Yamamoto
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Paper 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.

Paper Details

Date Published: 15 February 2010
PDF: 8 pages
Proc. SPIE 7611, Advances in Photonics of Quantum Computing, Memory, and Communication III, 76110J (15 February 2010); doi: 10.1117/12.841210
Show Author Affiliations
Susan M. Clark, Stanford Univ. (United States)
Kai-Mei C. Fu, Hewlett-Packard Labs (United States)
Qiang Zhang, Stanford Univ. (United States)
National Institute of Informatics (Japan)
Thaddeus D. Ladd, HRL Labs., LLC (United States)
Colin R. Stanley, Univ. of Glasgow (United Kingdom)
Yoshihisa Yamamoto, Stanford Univ. (United States)
National Institute of Informatics (Japan)

Published in SPIE Proceedings Vol. 7611:
Advances in Photonics of Quantum Computing, Memory, and Communication III
Zameer U. Hasan; Alan E. Craig; Philip R. Hemmer; Charles M. Santori, Editor(s)

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