Ultrafast optical spin echo for electron spins in semiconductors

Clark, S.M., Fu, K. M.C., Zhang, Q., Ladd, T.D., Stanley, C. and Yamamoto, Y. (2009) Ultrafast optical spin echo for electron spins in semiconductors. Physical Review Letters, 102(24), (doi: 10.1103/PhysRevLett.102.247601)

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Abstract

Spin-based quantum computing and magnetic resonance techniques rely on the ability to measure the coherence time T-2 of a spin system. We report on the experimental implementation of all-optical spin echo to determine the T-2 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 T-2 measurements of systems with dephasing times (T-2(*)) fast in comparison to the time scale for microwave control. This demonstration provides a step toward ultrafast optical dynamic decoupling of spin-based qubits.

Item Type:Articles
Keywords:GaAs, implementation, manipulation, physics, pulse, pulses, quantum dots, semiconductor, semiconductors, system, systems
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Stanley, Professor Colin
Authors: Clark, S.M., Fu, K. M.C., Zhang, Q., Ladd, T.D., Stanley, C., and Yamamoto, Y.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review Letters
Journal Abbr.:Phys. rev. letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114
Published Online:19 June 2009

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