Quantum-dot-spin single-photon interface

Using background-free detection of spin-state-dependent resonance fluorescence from a single-electron charged quantum dot with an efficiency of 0:1%, we realize a single spin-photon interface where the detection of a scattered photon with 300 picosecond time resolution projects the quantum dot spin...

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Bibliographic Details
Published in:arXiv.org 2010-05
Main Authors: Yilmaz, S T, Fallahi, P, Imamoglu, A
Format: Article
Language:English
Subjects:
Data processing
Demolition
Eigenvectors
Electron spin
Photonics
Photons
Quantum dots
Quantum entanglement
Quantum phenomena
Quantum theory
Resonance fluorescence
Single electrons
Spin dynamics
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Summary:Using background-free detection of spin-state-dependent resonance fluorescence from a single-electron charged quantum dot with an efficiency of 0:1%, we realize a single spin-photon interface where the detection of a scattered photon with 300 picosecond time resolution projects the quantum dot spin to a definite spin eigenstate with fidelity exceeding 99%. The bunching of resonantly scattered photons reveals information about electron spin dynamics. High-fidelity fast spin-state initialization heralded by a single photon enables the realization of quantum information processing tasks such as non-deterministic distant spin entanglement. Given that we could suppress the measurement back-action to well below the natural spin-flip rate, realization of a quantum non-demolition measurement of a single spin could be achieved by increasing the fluorescence collection efficiency by a factor exceeding 20 using a photonic nanostructure.
ISSN:2331-8422
DOI:10.48550/arxiv.1003.5195