Shields, Brendan John

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Shields, Brendan John

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Shields

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Brendan John

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Shields, Brendan John

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Integrated Diamond Networks for Quantum Nanophotonics
(American Chemical Society (ACS), 2012) Hausmann, Birgit Judith Maria; Shields, Brendan John; Quan, Qimin; Maletinsky, Patrick; McCutcheon, Murray; Choy, Jennifer Tze-Heng; Babinec, Tom M.; Kubanek, Alexander; Yacoby, Amir; Lukin, Mikhail; Loncar, Marko
We demonstrate an integrated nanophotonic network in diamond, consisting of a ring resonator coupled to an optical waveguide with grating in- and outcouplers. Using a nitrogen-vacancy color center embedded inside the ring resonator as a source of photons, single photon generation and routing at room temperature is observed. Furthermore, we observe a large overall photon extraction efficiency (10%) and high quality factors of ring resonators (3200 for waveguide-coupled system and 12 600 for a bare ring).
Tailoring Light-Matter Interaction with a Nanoscale Plasmon Resonator
(American Physical Society (APS), 2012) de Leon, Nathalie Pulmones; Shields, Brendan John; Yu, C; Englund, Dirk E.; Akimov, Alexey; Lukin, Mikhail; Park, Hongkun
We propose and demonstrate a new approach for achieving enhanced light-matter interactions with quantum emitters. Our approach makes use of a plasmon resonator composed of defect-free, highly crystalline silver nanowires surrounded by patterned dielectric distributed Bragg reflectors. These resonators have an effective mode volume (Veff) 2 orders of magnitude below the diffraction limit and a quality factor (Q) approaching 100, enabling enhancement of spontaneous emission rates by a factor exceeding 75 at the cavity resonance. We also show that these resonators can be used to convert a broadband quantum emitter to a narrow-band single-photon source with color-selective emission enhancement.
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.
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.
Diamond platforms for nanoscale photonics and metrology
(2014-06-06) Shields, Brendan John; Lukin, Mikhail D.; Park, Hongkun; Walsworth, Ronald
Observing and controlling solid state quantum systems is an area of intense research in quantum science today. Such systems offer the natural advantage of being bound into a solid device, eliminating the need for laser cooling and trapping of atoms in free space. These solid state "atoms" can interface directly with photonic channels designed to efficiently couple into larger networks of interacting quantum systems. With all of the tools of semiconductor fabrication technology available, the idea of scalable, chip-based quantum networks is a tantalizing prospect.
Efficient Readout of a Single Spin State in Diamond via Spin-to-Charge Conversion
(American Physical Society (APS), 2015) Shields, Brendan John; Unterreithmeier, Quirin; de Leon, Nathalie Pulmones; Park, Helen; Lukin, Mikhail
Efficient readout of individual electronic spins associated with atomlike impurities in the solid state is essential for applications in quantum information processing and quantum metrology. We demonstrate a new method for efficient spin readout of nitrogen-vacancy (NV) centers in diamond. The method is based on conversion of the electronic spin state of the NV to a charge-state distribution, followed by single-shot readout of the charge state. Conversion is achieved through a spin-dependent photoionization process in diamond at room temperature. Using NVs in nanofabricated diamond beams, we demonstrate that the resulting spin readout noise is within a factor of 3 of the spin projection noise level. Applications of this technique for nanoscale magnetic sensing are discussed.
Deterministic Coupling of a Single Nitrogen Vacancy Center to a Photonic Crystal Cavity
(American Chemical Society, 2010) Englund, Dirk; Shields, Brendan John; Rivoire, Kelley; Hatami, Fariba; Vučković, Jelena; Park, Hongkun; Lukin, Mikhail
We describe and experimentally demonstrate a technique for deterministic, large coupling between a photonic crystal (PC) nanocavity and single photon emitters. The technique is based on in situ scanning of a PC cavity over a sample and allows the precise positioning of the cavity over a desired emitter with nanoscale resolution. The power of the technique is demonstrated by coupling the PC nanocavity to a single nitrogen vacancy (NV) center in diamond, an emitter system that provides optically accessible electron and nuclear spin qubits.