Quantum-Dot Spin-State Preparation with Near-Unity Fidelity

We have demonstrated laser cooling of a single electron spin trapped in a semiconductor quantum dot. Optical coupling of electronic spin states was achieved using resonant excitation of the charged quantum dot (trion) transitions along with the heavy-light hole mixing, which leads to weak yet finite...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2006-04, Vol.312 (5773), p.551-553
Main Authors: Atatüre, Mete, Dreiser, Jan, Badolato, Antonio, Högele, Alexander, Karrai, Khaled, Imamoglu, Atac
Format: Article
Language:English
Subjects:
Classical and quantum physics: mechanics and fields
Cooling
Electric potential
Electron spin
Electrons
Exact sciences and technology
Lasers
Magnetic fields
Nanotechnology
Optical transition
Physics
Pumping
Quantum information
Quantum theory
Raman scattering
Spin resonance
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Summary:We have demonstrated laser cooling of a single electron spin trapped in a semiconductor quantum dot. Optical coupling of electronic spin states was achieved using resonant excitation of the charged quantum dot (trion) transitions along with the heavy-light hole mixing, which leads to weak yet finite rates for spin-flip Raman scattering. With this mechanism, the electron spin can be cooled from 4.2 to 0.020 kelvin, as confirmed by the strength of the induced Pauli blockade of the trion absorption. Within the framework of quantum information processing, this corresponds to a spin-state preparation with a fidelity exceeding 99.8%.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1126074