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Optically induced multispin entanglement in a semiconductor quantum well

Nature Materials volume 2, pages 175–179 (2003)Cite this article

Abstract

According to quantum mechanics, a many-particle system is allowed to exhibit non-local behaviour, in that measurements performed on one of the particles can affect a second one that is far away. These so-called entangled states are crucial for the implementation of most quantum information protocols and, in particular, gates for quantum computation. Here we use ultrafast optical pulses and coherent techniques to create and control spin-entangled states in an ensemble of non-interacting electrons bound to donors (at least three) and at least two Mn2+ ions in a CdTe quantum well. Our method, relying on the exchange interaction between localized excitons and paramagnetic impurities, can in principle be applied to entangle an arbitrarily large number of spins.

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Figure 1: Generic level structure of a system of paramagnetic impurities coupled to a single localized exciton in a quantum-well.
Figure 2: Spontaneous resonant Raman scattering data.
Figure 3: Time-domain experiments.
Figure 4: Frequency versus magnetic field.

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Acknowledgements

We acknowledge support from The Petroleum Research Fund, administered by the ACS (American Chemical Society), for partial support of this research. Work also supported by the NSF (National Science Foundation) under Grants No. PHY 0114336 and No. DMR 0072897, by the AFOSR(Air Force Office of Scientific Research) under contract F49620-00-1-0328 through the MURI program and by the DARPA-SpinS program. A.V.B. acknowledges partial support from CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), Argentina.

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Authors and Affiliations

  1. FOCUS Center and Department of Physics, The University of Michigan, Ann Arbor, 48109-1120, Michigan, USA

    Jiming Bao, Andrea V. Bragas & Roberto Merlin

  2. Department of Physics, University of Notre Dame, Notre Dame, 46556, Indiana, USA

    Jacek K. Furdyna

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  1. Jiming Bao
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  2. Andrea V. Bragas
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Correspondence to Roberto Merlin.

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Bao, J., Bragas, A., Furdyna, J. et al. Optically induced multispin entanglement in a semiconductor quantum well. Nature Mater 2, 175–179 (2003). https://doi.org/10.1038/nmat839

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