Quantum-Dot-Spin Single-Photon Interface

S. T. Yılmaz, P. Fallahi, and A. Imamoğlu
Phys. Rev. Lett. 105, 033601 – Published 15 July 2010

Abstract

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 classical single spin-photon interface where the detection of a scattered photon with 300 ps 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 nondeterministic distant spin entanglement. Given that we could suppress the measurement backaction to well below the natural spin-flip rate, realization of a quantum nondemolition measurement of a single spin could be achieved by increasing the fluorescence collection efficiency by a factor exceeding 10 using a photonic nanostructure.

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  • Received 26 March 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.033601

©2010 American Physical Society

Authors & Affiliations

S. T. Yılmaz, P. Fallahi, and A. Imamoğlu

  • Institute of Quantum Electronics, ETH Zurich, CH-8093 Zürich, Switzerland

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Issue

Vol. 105, Iss. 3 — 16 July 2010

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