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Universal quantum imaging

Title
Universal quantum imaging
Funding
ARC | Discovery Projects
Contract (GA) number
DP0985078
Start Date
2009/01/01
End Date
2011/12/31
Open Access mandate
no
Organizations
-
More information
http://purl.org/au-research/grants/arc/DP0985078

 

  • Optical lock-in particle tracking in optical tweezers

    Taylor, Michael A; Knittel, Joachim; Bowen, Warwick P (2013)
    Projects: ARC | Universal quantum imaging (DP0985078)
    We demonstrate a lock-in particle tracking scheme in optical tweezers based on stroboscopic modulation of an illuminating optical field. This scheme is found to evade low frequency noise sources while otherwise producing an equivalent position measurement to continuous measurement. This was demonstrated, and found to yield on average 20dB of noise suppression in the frequency range 10-5000 Hz, where low frequency laser noise and electronic noise was significant, and 35 dB of noise suppression...

    Fundamental constraints on particle tracking with optical tweezers

    Taylor, Michael A.; Knittel, Joachim; Bowen, Warwick P. (2012)
    Projects: ARC | Universal quantum imaging (DP0985078)
    A general quantum limit to the sensitivity of particle position measurements is derived following the simple principle of the Heisenberg microscope. The value of this limit is calculated for particles in the Rayleigh and Mie scattering regimes, and with parameters which are relevant to optical tweezers experiments. The minimum power required to observe the zero-point motion of a levitating bead is also calculated, with the optimal particle diameter always smaller than the wavelength. We show ...

    Quantum limited particle sensing in optical tweezers

    Tay, Jian Wei; Hsu, Magnus T. L.; Bowen, Warwick P. (2009)
    Projects: ARC | Universal quantum imaging (DP0985078)
    Particle sensing in optical tweezers systems provides information on the position, velocity and force of the specimen particles. The conventional quadrant detection scheme is applied ubiquitously in optical tweezers experiments to quantify these parameters. In this paper we show that quadrant detection is non-optimal for particle sensing in optical tweezers and propose an alternative optimal particle sensing scheme based on spatial homodyne detection. A formalism for particle sensing in terms...

    Sagnac Interferometer Enhanced Particle Tracking in Optical Tweezers

    Taylor, M. A.; Knittel, J.; Hsu, M. T. L.; Bachor, H. -A.; Bowen, W. P. (2010)
    Projects: ARC | Universal quantum imaging (DP0985078)
    A setup is proposed to enhance tracking of very small particles, by using optical tweezers embedded within a Sagnac interferometer. The achievable signal-to-noise ratio is shown to be enhanced over that for a standard optical tweezers setup. The enhancement factor increases asymptotically as the interferometer visibility approaches 100%, but is capped at a maximum given by the ratio of the trapping field intensity to the detector saturation threshold. For an achievable visibility of 99%, the ...

    Subdiffraction-limited quantum imaging within a living cell

    Taylor, Michael A.; Janousek, Jiri; Daria, Vincent; Knittel, Joachim; Hage, Boris; Bachor, Hans-A.; Bowen, Warwick P. (2013)
    Projects: ARC | Universal quantum imaging (DP0985078)
    We report both subdiffraction-limited quantum metrology and quantum-enhanced spatial resolution for the first time in a biological context. Nanoparticles are tracked with quantum-correlated light as they diffuse through an extended region of a living cell in a quantum-enhanced photonic-force microscope. This allows spatial structure within the cell to be mapped at length scales down to 10 nm. Control experiments in water show a 14% resolution enhancement compared to experiments with coherent ...

    Biological measurement beyond the quantum limit

    Taylor, Michael A.; Janousek, Jiri; Daria, Vincent; Knittel, Joachi; Hage, Boris; Bachor, Hans-A.; Bowen, Warwick P. (2012)
    Projects: ARC | Universal quantum imaging (DP0985078)
    Quantum noise places a fundamental limit on the per photon sensitivity attainable in optical measurements. This limit is of particular importance in biological measurements, where the optical power must be constrained to avoid damage to the specimen. By using non-classically correlated light, we demonstrated that the quantum limit can be surpassed in biological measurements. Quantum enhanced microrheology was performed within yeast cells by tracking naturally occurring lipid granules with sen...

    Programmable unitary spatial modes manipulation

    Morizur, J-F.; Nicholls, Lachlan; Jian, Pu; Armstrong, Seiji; Treps, Nicolas; Hage, Boris; Hsu, Magnus T. L.; Bowen, Warwick P.; Janousek, Jiri; Bachor, Hans A. (2010)
    Projects: ARC | Universal quantum imaging (DP0985078), EC | HIDEAS (221906)
    Free space propagation and conventional optical systems such as lenses and mirrors all perform spatial unitary transforms. However, the subset of transforms available through these conventional systems is limited in scope. We present here a unitary programmable mode converter (UPMC) capable of performing any spatial unitary transform of the light field. It is based on a succession of reflections on programmable deformable mirrors and free space propagation. We first show theoretically that a ...

    Spatial reshaping of a squeezed state of light

    Morizur, J. -F.; Armstrong, S.; Treps, N.; Janousek, J.; Bachor, H. -A. (2011)
    Projects: ARC | Universal quantum imaging (DP0985078), EC | HIDEAS (221906)

    Programmable unitary spatial mode manipulation

    Morizur, Jean-Francois; Nicholls, Lachlan; Jian, Pu; Armstrong, Seiji; Treps, Nicolas; Hage, Boris; Hsu, Magnus; Bowen, Warwick; Janousek, Jiri; Bachor, Hans-A (2010)
    Projects: ARC | Universal quantum imaging (DP0985078), EC | HIDEAS (221906)
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