Person: Otterbach, Johannes
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Otterbach
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Johannes
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Otterbach, Johannes
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Publication Phonon-Induced Spin-Spin Interactions in Diamond Nanostructures: Application to Spin Squeezing(American Physical Society (APS), 2013) Bennett, Steven; Yao, Norman; Otterbach, Johannes; Zoller, P.; Rabl, P.; Lukin, MikhailWe propose and analyze a novel mechanism for long-range spin-spin interactions in diamond nanostructures. The interactions between electronic spins, associated with nitrogen-vacancy centers in diamond, are mediated by their coupling via strain to the vibrational mode of a diamond mechanical nanoresonator. This coupling results in phonon-mediated effective spin-spin interactions that can be used to generate squeezed states of a spin ensemble. We show that spin dephasing and relaxation can be largely suppressed, allowing for substantial spin squeezing under realistic experimental conditions. Our approach has implications for spin-ensemble magnetometry, as well as phonon-mediated quantum information processing with spin qubits.Publication Dissipative Preparation of Spin Squeezed Atomic Ensembles in a Steady State(American Physical Society (APS), 2013) Dalla Torre, Emanuele; Otterbach, Johannes; Demler, Eugene; Vuletic, Vladan; Lukin, MikhailWe present and analyze a new approach for the generation of atomic spin-squeezed states. Our method involves the collective coupling of an atomic ensemble to a decaying mode of an open optical cavity. We demonstrate the existence of a collective atomic dark state, decoupled from the radiation field. By explicitly constructing this state we find that it can feature spin squeezing bounded only by the Heisenberg limit. We show that such dark states can be deterministically prepared via dissipative means, thus turning dissipation into a resource for entanglement. The scaling of the phase sensitivity taking realistic imperfections into account is discussed.Publication Photon-Photon Interactions via Rydberg Blockade(American Physical Society, 2011) Gorshkov, Alexey; Otterbach, Johannes; Fleischhauer, Michael; Pohl, Thomas; Lukin, MikhailWe develop the theory of light propagation under the conditions of electromagnetically induced transparency in systems involving strongly interacting Rydberg states. Taking into account the quantum nature and the spatial propagation of light, we analyze interactions involving few-photon pulses. We show that this system can be used for the generation of nonclassical states of light including trains of single photons with an avoided volume between them, for implementing photon-photon gates, as well as for studying many-body phenomena with strongly correlated photons.Publication Photonic Phase Gate via an Exchange of Fermionic Spin Waves in a Spin Chain(American Physical Society, 2010) Gorshkov, Alexey; Otterbach, Johannes; Demler, Eugene; Fleischhauer, Michael; Lukin, MikhailWe propose a new protocol for implementing the two-qubit photonic phase gate. In our approach, the pi phase is acquired by mapping two single photons into atomic excitations with fermionic character and exchanging their positions. The fermionic excitations are realized as spin waves in a spin chain, while photon storage techniques provide the interface between the photons and the spin waves. Possible imperfections and experimental systems suitable for implementing the gate are discussed.