Bulletin of the American Physical Society
47th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 61, Number 8
Monday–Friday, May 23–27, 2016; Providence, Rhode Island
Session C4: Hybrid Quantum Systems |
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Chair: Ana Maria Rey, University of Colorado Room: 554AB |
Tuesday, May 24, 2016 2:00PM - 2:12PM |
C4.00001: Cooling of the Mechanical Motion of Diamond Nanocrystals in a Magneto-Gravitational Trap in High Vacuum Jen-Feng Hsu, Peng Ji, Charles W. Lewandowski, Brian D'Urso We present a magneto-gravitational trap for diamagnetic particles, such as diamond nanocrystals, with stable trapping from atmospheric pressure to high vacuum. Characterization and feedback cooling of the mechanical motion of the trapped particle are described. This static trap is achieved by permanent magnets and ferromagnetic pole pieces. The magnetic field confines the particle in two dimensions, while confinement in the third dimension relies on gravity. The weak trapping forces result in mechanical oscillation frequencies in the extremely low to super low frequency range and exceptionally high sensitivity to external forces. Particles can be trapped for an indefinite length of time without active cooling. With feedback, the mechanical motion can be cooled by several orders of magnitude. With trapped diamond nanocrystals containing nitrogen-vacancy centers, the system has potential as a platform for experiments in quantum nanomechanics. [Preview Abstract] |
Tuesday, May 24, 2016 2:12PM - 2:24PM |
C4.00002: Strain engineering of diamond silicon vacancy centers in MEMS cantilevers Srujan Meesala, Young-Ik Sohn, Haig Atikian, Jeffrey Holzgrafe, Mian Zhang, Michael Burek, Marko Loncar The silicon vacancy (SiV) center in diamond has recently attracted attention as a solid state quantum emitter due to its attractive optical properties. We fabricate diamond MEMS cantilevers, and use electrostatic actuation to apply controlled strain fields to single SiV centers implanted in these devices. The strain response of the four electronic transitions of the SiV at 737 nm is measured via cryogenic (4 K) photoluminescence excitation. We demonstrate over 300 GHz of tuning for the mean transition frequency between the ground and excited states, and over 100 GHz of tuning for the orbital splittings within the ground and excited states. The interaction Hamiltonian for strain fields is inferred, and large strain susceptibilities of the order 1 PHz/strain are measured. We discuss prospects to utilize our device to reduce phonon-induced decoherence in SiV spin qubits, and to exploit the large strain susceptibilities for hybrid quantum systems based on nanomechanical resonators. [Preview Abstract] |
Tuesday, May 24, 2016 2:24PM - 2:36PM |
C4.00003: Electron spin control of optically levitated nanodiamonds in vacuum Thai Hoang, Jonghoon Ahn, Jaehoon Bang, Tongcang Li Electron spins of diamond nitrogen-vacancy (NV) centers are important quantum resources for nanoscale sensing and quantum information. Combining such NV spin systems with levitated optomechanical resonators will provide a hybrid quantum system for many novel applications. Here we optically levitate a nanodiamond and demonstrate electron spin control of its built-in NV centers in low vacuum. We observe that the strength of electron spin resonance (ESR) is enhanced when the air pressure is reduced. To better understand this novel system, we also investigate the effects of trap power and measure the absolute internal temperature of levitated nanodiamonds with ESR after calibration of the strain effect. [Preview Abstract] |
Tuesday, May 24, 2016 2:36PM - 2:48PM |
C4.00004: Optical hyperpolarization and inductive readout of $^{31}P$ donor nuclei in natural abundance single crystal $^{29}Si$ Thomas Alexander, Holger Haas, Rahul Deshpande, Patryk Gumann, David Cory We optically polarize and inductively detect $^{31}P$ donor nuclei in single crystal silicon at high magnetic fields ($6.7T$). Samples include both natural abundance $^{29}Si$ and an isotopically purified $^{28}Si$ sample. We observe dipolar order in the $^{29}Si$ nuclear spins through a spin-locking measurement. This provides a means of characterizing spin transport in the vicinity of the $^{31}P$ donors. [Preview Abstract] |
Tuesday, May 24, 2016 2:48PM - 3:00PM |
C4.00005: A Rydberg atom-photon-superconductor quantum interface J.A. Isaacs, D.W. Booth, M.A. Beck, J.D. Pritchard, T Xia, R. McDermott, M. Saffman Hybrid quantum computation bridges disparate quantum technologies in order to achieve fast gates with long coherence times. Our implementation (Phys. Rev. A \textbf{89}, 010301(R) (2014)) combines superconducting circuit-QED with singly trapped Rydberg atoms. Introducing typical AMO techniques into cryogenic environments required the development of several novel approaches that we will discuss in our talk. Our current experiment involves trapping cesium atoms inside a 4~K cryostat, transporting them first horizontally and then vertically up to a superconducting coplanar waveguide resonator. After transport we use a novel two-photon Rydberg excitation via the $6S_{1/2}\rightarrow5D_{5/2}$ quadrupole transition to enable direct excitation of $nP_{3/2}$ states for strong electric-dipole coupling to the cavity. This excitation scheme significantly reduces the Doppler mismatch compared to previous two-photon excitation schemes to enable high fidelity operations. First optical spectroscopy and Rabi oscillation results will be shown along with microwave cavity coupling data. Experimental and theoretical efforts toward increasing fidelity of our operations by minimizing sensitivity of the Rydberg atoms to stray external electric fields will be discussed. [Preview Abstract] |
Tuesday, May 24, 2016 3:00PM - 3:12PM |
C4.00006: Realization of a cryogenic interface to an ultracold atomic chamber Aditya Date, Ke Wang, Airlia Shaffer, Yogesh Sharad Patil, Keith Schwab, Mukund Vengalattore The control and manipulation of ultracold atoms in close proximity to cryogenic material surfaces opens up novel avenues for quantum sensing with cold atoms. However, integrating cryogenics with cold atomic systems presents the dual challenges of reducing thermal radiation load while allowing optimal optical access. Here, we present the realization of a unique interface between a cryogenic system and a room-temperature ultracold atomic chamber which allows for the optical trapping of cold atoms within microns of a sub-10 K cryogenic surface. Our interface serves as a platform for a cold-atoms based precision magnetic microscope for probing exotic condensed matter systems such as correlated electronic materials, as well as a platform for the realization of hybrid quantum systems. [Preview Abstract] |
Tuesday, May 24, 2016 3:12PM - 3:24PM |
C4.00007: Cavity coupling of atomic spin and motion Jonathan Kohler, Justin Gerber, Nicolas Spethmann, Sydney Schreppler, Dan Stamper-Kurn Optical cavities have been used to realize sensitive, quantum limited measurements of both the spin and mechanical degrees of freedom of atomic ensembles. We have previously demonstrated cavity assisted measurement and control of a spin-oscillator, where the total atomic spin precesses around an external magnetic field. The spin-oscillator can realize an effective negative mass oscillator, for excitations around its highest energy state. In this talk, I will present our most recent work toward coupling the mechanical and spin degree of freedom of one or more atomic ensembles, with the goal of realizing Coherent Quantum Noise Cancelation for back-action evading measurements. [Preview Abstract] |
Tuesday, May 24, 2016 3:24PM - 3:36PM |
C4.00008: Spin noise in mixed Spin Systems Erik Bauch, Paul Junghyun, Swati Singh, Trithep Devakul, Adrian Feguin, Connor Hart, Ronald Walsworth The spin noise due to interaction of multiple spin species in mixed spin systems provides a fundamental limit to ultra-sensitive ensemble sensing and quantum information applications. In our work, we investigate the interaction of dense nuclear 13C spins with electronic nitrogen spins using Nitrogen-Vacancy centers in diamond. Our work shows experimentally and theoretically, that under certain conditions, spin noise is greatly suppressed and the coherence time of NV centers improved by order of magnitudes, providing a pathway to engineering high density ensemble samples with long coherence times at room temperature. [Preview Abstract] |
Tuesday, May 24, 2016 3:36PM - 3:48PM |
C4.00009: Cavity magnomechanics Chang-Ling Zou, Xufeng Zhang, Liang Jiang, Hong Tang Recently, cavity magnonics has attracted much attention for potential applications of coherent information transduction and hybrid quantum devices. The magnon is a collective spin wave excitation in ferromagnetic material. It is magnetically tunability, with long coherence time and non-reciprocical interaction with electro-magnetic fields. We report the coherent coupling between magnon, microwave photon and phonon. First, we demonstrate strong coupling and ultrastrong coupling between the magnon in YIG sphere and microwave photon in three-dimensional cavity. Then, based on the hybridized magnon-photon modes, we observe the triply resonant magnon-mcirowave photon-phonon coupling, where the ultrahigh-Q mechanical vibration of YIG sphere is dispersively coupled with the magnon via magnetostrictive interaction. We observe interesting phenomena, including electromagnetically induced transparency/absorption and parametric amplification. In particular, benefit from the large tunability of the magnon, we demonstrate a tunable microwave amplifier with gain as high as 30 dB. The single crystal YIG also has excellent optical properties, and thus provide a unique platform bridging MHz, GHz and THz information carriers. Finally, we present the latest progress towards coherent magnon to optical photon conversion. [Preview Abstract] |
Tuesday, May 24, 2016 3:48PM - 4:00PM |
C4.00010: Atom-assisted quadrature squeezing of a mechanical oscillator inside a dispersive cavity Asoka Biswas, Anil Kumar Chauhan Measurement of position of a mesoscopic harmonic oscillator below standard quantum limit in cavity optomechanics has seen a growing interest in recent times. If the oscillator is suspended inside the cavity (with both the mirrors fixed) at a position where the cavity frequency becomes extremum (a membrane-in-the-middle setup), large squeezing can be achieved by conditional measurement of thermal photons; however the cavity decay degrades such squeezing. Here we propose an atom-cavity-oscillator hybrid scheme, in which the effect of cavity decay is eliminated via dispersive coupling of the cavity mode. The atom in $\Lambda$ configuration is considered to be trapped on either side of the membrane inside the cavity. We show that a considerable amount of squeezing (far beyond the 3 dB limit) can be achieved that is not affected by spontaneous emission of the atom. The squeezing depends upon the initial preparation of the atomic states. Further, the external classical fields, that drive the atomic transition and the cavity mode, control the degree of squeezing and can also lead to a strong effective atom-oscillator coupling. Effect of thermal phonon bath on squeezing is studied in terms of the squeezing spectrum. The results are supported by the detailed analytical calculations. [Preview Abstract] |
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