Ultrafast Optical Spin Echo for Electron Spins in Semiconductors

Journal Article · Fri Jun 19 04:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.102.247601· OSTI ID:21346988

Clark, Susan M ^[1]; Fu, Kai-Mei C ^[2]; Qiang, Zhang; Ladd, Thaddeus D; Yamamoto, Yoshihisa ^[1]; Stanley, Colin ^[3]

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1. Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305-4088 (United States)
2. Information and Quantum Systems, Hewlett-Packard Laboratories, 1501 Page Mill Road, MS1123, Palo Alto, California 94304 (United States)
3. Department of Electronics and Electrical Engineering, Oakfield Avenue, University of Glasgow, Glasgow, G12 8LT (United Kingdom)

Spin-based quantum computing and magnetic resonance techniques rely on the ability to measure the coherence time T{sub 2} of a spin system. We report on the experimental implementation of all-optical spin echo to determine the T{sub 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{sub 2} measurements of systems with dephasing times (T{sub 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.

• OSTI ID: 21346988
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 102; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR MOMENTUM
COMPUTERS
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
INFORMATION
LEPTONS
MAGNETIC RESONANCE
MATERIALS
MICROWAVE RADIATION
PARTICLE PROPERTIES
PULSES
QUANTUM COMPUTERS
QUANTUM INFORMATION
QUBITS
RADIATIONS
RESONANCE
SEMICONDUCTOR MATERIALS
SIGNALS
SPIN
SPIN ECHO