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Future Fellowships - Grant ID: FT140100650

Title
Future Fellowships - Grant ID: FT140100650
Funding
ARC | Future Fellowships
Contract (GA) number
FT140100650
Start Date
2014/01/01
End Date
2018/12/31
Open Access mandate
no
Organizations
-
More information
http://purl.org/au-research/grants/arc/FT140100650

 

  • Non-destructive profilometry of optical nanofibres

    Madsen, Lars S.; Baker, Christopher; Rubinsztein-Dunlop, Halina; Bowen, Warwick P. (2016)
    Projects: ARC | Future Fellowships - Grant ID: FT140100650 (FT140100650)
    Single-mode optical nanofibres are a central component of a broad range of applications and emerging technologies. Their fabrication has been extensively studied over the past decade, but imaging of the final sub-micrometre products has been restricted to destructive or low-precision techniques. Here we demonstrate an optical scattering-based scanning method that uses a probe nanofibre to locally scatter the evanescent field of a sample nanofibre. The method does not damage the sample nanofib...

    Quantum Thermodynamics Beyond the Rotating Wave Approximation

    Bennett, James S.; Madsen, Lars S.; Rubinsztein-Dunlop, Halina; Bowen, Warwick P. (2017)
    Projects: ARC | Future Fellowships - Grant ID: FT140100650 (FT140100650)
    We consider a thermodynamic system in which the working fluid is a quantized harmonic oscillator subjected to periodic squeezing operations at a rate much larger than its resonance frequency. When the oscillator--bath coupling is treated with the conventional rotating wave approximation (RWA) we find that the system can behave as a heat pump. Without the RWA a much richer picture emerges, including refrigeration and heat engine behaviors, and a new method of parametric cooling of the oscillat...

    Quantum enhanced feedback cooling of a mechanical oscillator using nonclassical light

    Sch?fermeier, Clemens; Kerdoncuff, Hugo; Hoff, Ulrich B.; Fu, Hao; Huck, Alexander; Bilek, Jan; Harris, Glen I.; Bowen, Warwick P.; Gehring, Tobias; Andersen, Ulrik L. (2016)
    Projects: ARC | Future Fellowships - Grant ID: FT140100650 (FT140100650)
    Laser cooling is a fundamental technique used in primary atomic frequency standards, quantum computers, quantum condensed matter physics and tests of fundamental physics, among other areas. It has been known since the early 1990s that laser cooling can, in principle, be improved by using squeezed light as an electromagnetic reservoir; while quantum feedback control using a squeezed light probe is also predicted to allow improved cooling. Here, we implement quantum feedback control of a micro-...

    Microphotonic Forces from Superfluid Flow

    D. L. McAuslan; G. I. Harris; C. Baker; Y. Sachkou; X. He; E. Sheridan; W. P. Bowen (2016)
    Projects: ARC | Future Fellowships - Grant ID: FT140100650 (FT140100650)
    In cavity optomechanics, radiation pressure and photothermal forces are widely utilized to cool and control micromechanical motion, with applications ranging from precision sensing and quantum information to fundamental science. Here, we realize an alternative approach to optical forcing based on superfluid flow and evaporation in response to optical heating. We demonstrate optical forcing of the motion of a cryogenic microtoroidal resonator at a level of 1.46 nN, roughly 1 order of magnitude...

    Thin film superfluid optomechanics

    Baker, Christopher G.; Harris, Glen I.; McAuslan, David L.; Sachkou, Yauhen; He, Xin; Bowen, Warwick P. (2016)
    Projects: ARC | Future Fellowships - Grant ID: FT140100650 (FT140100650)
    Excitations in superfluid helium represent attractive mechanical degrees of freedom for cavity optomechanics schemes. Here we numerically and analytically investigate the properties of optomechanical resonators formed by thin films of superfluid $^4$He covering micrometer-scale whispering gallery mode cavities. We predict that through proper optimization of the interaction between film and optical field, large optomechanical coupling rates $g_0>2\pi \times 100$ kHz and single photon cooperati...

    Phonon antibunching effect in coupled nonlinear micro/nanomechanical resonator at finite temperature

    Guan, Shengguo; Bowen, Warwick; Liu, Cunjin; Duan, Zhenglu (2017)
    Projects: ARC | Future Fellowships - Grant ID: FT140100650 (FT140100650)
    In this study, we investigate the phonon antibunching effect in a coupled nonlinear micro/nanoelectromechanical system (MEMS/NEMS) resonator at a finite temperature. In the weak driving limit, the optimal condition for phonon antibunching is given by solving the stationary Liouville-von Neumann master equation. We show that at low temperature, the phonon antibunching effect occurs in the regime of weak nonlinearity and mechanical coupling, which is confirmed by analytical and numerical soluti...

    A Quantum Optomechanical Interface Beyond the Resolved Sideband Limit

    Bennett, James S.; Khosla, Kiran; Madsen, Lars S.; Vanner, Michael R.; Rubinsztein-Dunlop, Halina; Bowen, Warwick P. (2015)
    Projects: ARC | Future Fellowships - Grant ID: FT140100650 (FT140100650), ARC | Discovery Projects - Grant ID: DP140101638 (DP140101638)
    Mechanical oscillators which respond to radiation pressure are a promising means of transferring quantum information between light and matter. Optical--mechanical state swaps are a key operation in this setting. Existing proposals for optomechanical state swap interfaces are only effective in the resolved sideband limit. Here, we show that it is possible to fully and deterministically exchange mechanical and optical states outside of this limit, in the common case that the cavity linewidth is...

    High bandwidth on-chip capacitive tuning of microtoroid resonators

    Baker, Christopher G.; Bekker, Christiaan; McAuslan, David L.; Sheridan, Eoin; Bowen, Warwick P. (2016)
    Projects: ARC | Linkage Projects - Grant ID: LP140100595 (LP140100595), ARC | Future Fellowships - Grant ID: FT140100650 (FT140100650)
    We report on the design, fabrication and characterization of silica microtoroid based cavity opto-electromechanical systems (COEMS). Electrodes patterned onto the microtoroid resonators allow for rapid capacitive tuning of the optical whispering gallery mode resonances while maintaining their ultrahigh quality factor, enabling applications such as efficient radio to optical frequency conversion, optical routing and switching applications.

    Quantum optomechanics beyond the quantum coherent oscillation regime

    Khosla, Kiran; Brawley, George A.; Vanner, Michael R.; Bowen, Warwick P. (2017)
    Projects: ARC | Future Fellowships - Grant ID: FT140100650 (FT140100650), ARC | Discovery Projects - Grant ID: DP140100734 (DP140100734)
    Interaction with a thermal environment decoheres the quantum state of a mechanical oscillator. When the interaction is sufficiently strong, such that more than one thermal phonon is introduced within a period of oscillation, quantum coherent oscillations are prevented. This is generally thought to preclude a wide range of quantum protocols. Here, we introduce a pulsed optomechanical protocol that allows ground state cooling, general linear quantum non-demolition measurements, optomechanical s...

    Quantum enhanced optomechanical magnetometry

    Li, Bei-Bei; Bilek, Jan; Hoff, Ulrich B.; Madsen, Lars S.; Forstner, Stefan; Prakash, Varun; Schäfermeier, Clemens; Gehring, Tobias; Bowen, Warwick P.; Andersen, Ulrik L. (2018)
    Projects: ARC | Future Fellowships - Grant ID: FT140100650 (FT140100650), ARC | Discovery Projects - Grant ID: DP140100734 (DP140100734)
    The resonant enhancement of both mechanical and optical response in microcavity optomechanical devices allows exquisitely sensitive measurements of stimuli such as acceleration, mass and magnetic fields. In this work, we show that quantum correlated light can improve the performance of such sensors, increasing both their sensitivity and their bandwidth. Specifically, we develop a silicon-chip based cavity optomechanical magnetometer that incorporates phase squeezed light to suppress optical s...
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