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Dutt, M

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Dutt

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Dutt, M

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2008 - 20103

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Author's Publications: search.filters.isAuthorOfPublication.6a58cb1c-da08-41e2-ac7d-0f812873a4ce

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    Quantum entanglement between an optical photon and a solid-state spin qubit
    (Nature Publishing Group, 2010) Togan, E; Chu, Y.; Trifonov, Alexei; Jiang, L.; Maze, J.; Childress, Lilian I.; Dutt, M; Sørensen, A. S.; Hemmer, Philip; Zibrov, Alexander; Lukin, Mikhail
    Quantum entanglement is among the most fascinating aspects of quantum theory1. Entangled optical photons are now widely used for fundamental tests of quantum mechanics2 and applications such as quantum cryptography1. Several recent experiments demonstrated entanglement of optical photons with trapped ions3, atoms4, 5 and atomic ensembles6, 7, 8, which are then used to connect remote long-term memory nodes in distributed quantum networks9, 10, 11. Here we realize quantum entanglement between the polarization of a single optical photon and a solid-state qubit associated with the single electronic spin of a nitrogen vacancy centre in diamond. Our experimental entanglement verification uses the quantum eraser technique5, 12, and demonstrates that a high degree of control over interactions between a solid-state qubit and the quantum light field can be achieved. The reported entanglement source can be used in studies of fundamental quantum phenomena and provides a key building block for the solid-state realization of quantum optical networks13, 14.
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    Strong Magnetic Coupling Between an Electronic Spin Qubit and a Mechanical Resonator
    (American Physical Society, 2009) Rabl, P; Cappellaro, P; Dutt, M; Jiang, Liang; Maze, J. R.; Lukin, Mikhail
    We describe a technique that enables a strong coherent coupling between a single electronic spin qubit associated with a nitrogen-vacancy impurity in diamond and the quantized motion of a magnetized nanomechanical resonator tip. This coupling is achieved via careful preparation of dressed spin states which are highly sensitive to the motion of the resonator but insensitive to perturbations from the nuclear-spin bath. In combination with optical pumping techniques, the coherent exchange between spin and motional excitations enables ground-state cooling and controlled generation of arbitrary quantum superpositions of resonator states Optical spin readout techniques provide a general measurement toolbox for the resonator with quantum limited precision.
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    Coherence of an Optically Illuminated Single Nuclear Spin Qubit
    (American Physical Society, 2008) Jiang, Liang; Dutt, M; Togan, E; Childress, Lily; Cappellaro, Paola; Taylor, Jacob; Lukin, Mikhail
    We investigate the coherence properties of individual nuclear spin quantum bits in diamond [Dutt et al., Science, 316, 1312 (2007)] when a proximal electronic spin associated with a nitrogen-vacancy (NV) center is being interrogated by optical radiation. The resulting nuclear spin dynamics are governed by time-dependent hyperfine interaction associated with rapid electronic transitions, which can be described by a spin-fluctuator model. We show that due to a process analogous to motional averaging in nuclear magnetic resonance, the nuclear spin coherence can be preserved after a large number of optical excitation cycles. Our theoretical analysis is in good agreement with experimental results. It indicates a novel approach that could potentially isolate the nuclear spin system completely from the electronic environment.