Abstract
Spin-based quantum computing and magnetic resonance techniques rely on the ability to measure the coherence time of a spin system. We report on the experimental implementation of all-optical spin echo to determine the 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 measurements of systems with dephasing times () fast in comparison to the time scale for microwave control. This demonstration provides a step toward ultrafast optical dynamic decoupling of spin-based qubits.
- Received 3 April 2009
DOI:https://doi.org/10.1103/PhysRevLett.102.247601
©2009 American Physical Society
Synopsis
Optical echoes cut through the noise
Published 22 June 2009
The demonstration of all-optical spin-echo measurements may provide a route toward decoupling spins from noise sources.
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