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Zibrov, Alexander

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Zibrov

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Alexander

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Zibrov, Alexander
Author's Publications: search.filters.isAuthorOfPublication.15336a66-a893-4751-9fc8-572d2ac2a532

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Now showing 1 - 10 of 16
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    Coherence and Raman Sideband Cooling of a Single Atom in an Optical Tweezer
    (American Physical Society, 2013) Thompson, Jeffrey Douglas; Tiecke, Tobias; Zibrov, Alexander; Vuletić, V.; Lukin, Mikhail
    We investigate quantum control of a single atom in a tightly focused optical tweezer trap. We show that inevitable spatially varying polarization gives rise to significant internal-state decoherence but that this effect can be mitigated by an appropriately chosen magnetic bias field. This enables Raman sideband cooling of a single atom close to its three-dimensional ground state (vibrational quantum numbers \(\bar n_x=\bar n_y=0.01, \bar n_z=8)\) even for a trap beam waist as small as \(\omega=900  nm\). The small atomic wave packet with \(\delta x=\delta y=24  nm\) and \(\delta z=270  nm\) represents a promising starting point for future hybrid quantum systems where atoms are placed in close proximity to surfaces.
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    Coupling a Single Trapped Atom to a Nanoscale Optical Cavity
    (American Association for the Advancement of Science (AAAS), 2013) Thompson, Jeffrey Douglas; Tiecke, Tobias; de Leon, Nathalie Pulmones; Feist, J.; Akimov, Alexey; Gullans, Michael John; Zibrov, Alexander; Vuletic, V.; Lukin, Mikhail
    Hybrid quantum devices, in which dissimilar quantum systems are combined in order to attain qualities not available with either system alone, may enable far-reaching control in quantum measurement, sensing, and information processing. A paradigmatic example is trapped ultracold atoms, which offer excellent quantum coherent properties, coupled to nanoscale solid-state systems, which allow for strong interactions. We demonstrate a deterministic interface between a single trapped rubidium atom and a nanoscale photonic crystal cavity. Precise control over the atom's position allows us to probe the cavity near-field with a resolution below the diffraction limit and to observe large atom-photon coupling. This approach may enable the realization of integrated, strongly coupled quantum nano-optical circuits.
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    Quantum Interference of Single Photons from Remote Nitrogen-Vacancy Centers in Diamond
    (American Physical Society (APS), 2012) Sipahigil, Alp; Goldman, Michael Lurie; Togan, E; Chu, Yiwen; Markham, M.; Twitchen, D. J.; Zibrov, Alexander; Kubanek, Alexander; Lukin, Mikhail
    We demonstrate quantum interference between indistinguishable photons emitted by two nitrogen-vacancy (NV) centers in distinct diamond samples separated by two meters. Macroscopic solid immersion lenses are used to enhance photon collection efficiency. Quantum interference is verified by measuring a value of the second-order cross-correlation function g(2)(0)=0.35±0.04<0.5. In addition, optical transition frequencies of two separated NV centers are tuned into resonance with each other by applying external electric fields. Extension of the present approach to generate entanglement of remote solid-state qubits is discussed.
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    Free-Standing Mechanical and Photonic Nanostructures in Single-Crystal Diamond
    (American Chemical Society (ACS), 2012) Burek, Michael; de Leon, Nathalie Pulmones; Shields, Brendan John; Hausmann, Birgit Judith Maria; Chu, Yiwen; Quan, Qimin; Zibrov, Alexander; Park, Hongkun; Lukin, Mikhail; Loncar, Marko
    A variety of nanoscale photonic, mechanical, electronic, and optoelectronic devices require scalable thin film fabrication. Typically, the device layer is defined by thin film deposition on a substrate of a different material, and optical or electrical isolation is provided by the material properties of the substrate or by removal of the substrate. For a number of materials this planar approach is not feasible, and new fabrication techniques are required to realize complex nanoscale devices. Here, we report a three-dimensional fabrication technique based on anisotropic plasma etching at an oblique angle to the sample surface. As a proof of concept, this angled-etching methodology is used to fabricate free-standing nanoscale components in bulk single-crystal diamond, including nanobeam mechanical resonators, optical waveguides, and photonic crystal and microdisk cavities. Potential applications of the fabricated prototypes range from classical and quantum photonic devices to nanomechanical-based sensors and actuators.
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    Conjugate Fabry–Perot Cavity Pair for Improved Astro-Comb Accuracy
    (Optical Society of America, 2012) Li, Chih-Hao; Guoqing, Chang; Glenday, Alexander; Langellier, Nicholas; Zibrov, Alexander; Phillips, David; Kärtner, Franz X.; Szentgyorgyi, Andrew; Walsworth, Ronald
    We propose a new astro-comb mode-filtering scheme composed of two Fabry–Perot cavities (coined “conjugate Fabry–Perot cavity pair”). Simulations indicate that this new filtering scheme makes the accuracy of astro-comb spectral lines more robust against systematic errors induced by nonlinear processes associated with power-amplifying and spectral-broadening optical fibers.
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    Coupling of NV Centers to Photonic Crystal Nanobeams in Diamond
    (American Chemical Society (ACS), 2013) Hausmann, Birgit Judith Maria; Shields, Brendan John; Quan, Qimin; Chu, Yiwen; de Leon, Nathalie Pulmones; Evans, Ruffin; Burek, Michael; Zibrov, Alexander; Markham, M.; Twitchen, D. J.; Park, Hongkun; Lukin, Mikhail; Loncar, Marko
    The realization of efficient optical interfaces for solid-state atom-like systems is an important problem in quantum science with potential applications in quantum communications and quantum information processing. We describe and demonstrate a technique for coupling single nitrogen vacancy (NV) centers to suspended diamond photonic crystal cavities with quality factors up to 6000. Specifically, we present an enhancement of the NV center’s zero-phonon line fluorescence by a factor of 7 in low-temperature measurements.
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    Coherent-Population-Trapping Resonances with Linearly Polarized Light for All-Optical Miniature Atomic Clocks
    (American Physical Society (APS), 2010) Zibrov, Sergei A.; Novikova, Irina; Phillips, David; Walsworth, Ronald; Zibrov, Alexander; Velichansky, Vladimir L.; Taichenachev, Alexey V.; Yudin, Valery I.
    We present a joint theoretical and experimental characterization of the coherent population trapping (CPT) resonance excited on the \(D_1\) line of \(^{87}Rb\) atoms by bichromatic linearly polarized laser light. We observe high-contrast transmission resonances (up to ≈25%), which makes this excitation scheme promising for miniature all-optical atomic clock applications. We also demonstrate cancellation of the first-order light shift by proper choice of the frequencies and relative intensities of the two laser-field components. Our theoretical predictions are in good agreement with the experimental results.
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    Far-Field Optical Imaging and Manipulation of Individual Spins with Nanoscale Resolution
    (Nature Publishing Group, 2010) Maurer, Peter Christian; Maze, J. R.; Stanwix, P. L.; Jiang, L.; Gorshkov, Alexey; Zibrov, A. A.; Harke, B.; Hodges, J. S.; Zibrov, Alexander; Yacoby, Amir; Twitchen, D.; Hell, S. W.; Walsworth, Ronald; Lukin, Mikhail
    A fundamental limit to existing optical techniques for measurementand manipulation of spin degrees of freedom is set by diffraction, which does not allow spins separated by less than about a quarter of a micrometre to be resolved using conventional far-field optics. Here, we report an efficient far-field optical technique that overcomes the limiting role of diffraction, allowing individual electronic spins to be detected, imaged and manipulated coherently with nanoscale resolution. The technique involves selective flipping of the orientation of individual spins, associated with nitrogen-vacancy centres in room-temperature diamond, using a focused beam of light with intensity vanishing at a controllable location, which enables simultaneous single-spin imaging and magnetometry at the nanoscale with considerably less power than conventional techniques. Furthermore, by inhibiting spin transitions away from the laser intensity null, selective coherent rotation of individual spins is realized. This technique can be extended to subnanometre dimensions, thus enabling applications in diverse areas ranging from quantum information science to bioimaging.
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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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    Coherent Optical Transitions in Implanted Nitrogen Vacancy Centers
    (American Chemical Society (ACS), 2014) Chu, Y.; de Leon, Nathalie Pulmones; Shields, B.J.; Hausmann, B.; Evans, R.; Togan, E.; Burek, Michael; Markham, M.; Stacey, A.; Zibrov, Alexander; Yacoby, Amir; Twitchen, D.J.; Loncar, Marko; Park, H.; Maletinsky, P.; Lukin, Mikhail
    We report the observation of stable optical transitions in nitrogen-vacancy (NV) centers created by ion implantation. Using a combination of high temperature annealing and subsequent surface treatment, we reproducibly create NV centers with zero-phonon lines (ZPL) exhibiting spectral diffusion that is close to the lifetime-limited optical line width. The residual spectral diffusion is further reduced by using resonant optical pumping to maintain the NV– charge state. This approach allows for placement of NV centers with excellent optical coherence in a well-defined device layer, which is a crucial step in the development of diamond-based devices for quantum optics, nanophotonics, and quantum information science.