Ultrasensitive measurement of microcantilever displacement below the shot-noise limit

Pooser, Raphael C.; Lawrie, Benjamin J.

doi:10.1364/optica.2.000393

Cited by 162 publications

(111 citation statements)

References 52 publications

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“…The first state is usually obtained by splitting a single pseudo-thermal beam through a beam-splitter. In this case it holds (derived from Eq.s (47) and (48) considering M independent modes and with the substitution η j → T j ):…”

Section: Theory Of Conventional Gimentioning

confidence: 99%

Photon-number correlation for quantum enhanced imaging and sensing

Meda¹,

Losero²,

Samantaray³

et al. 2017

J. Opt.

101

106

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In this review we present the potentialities and the achievements of the use of non-classical photon number correlations in twin beams (TWB) states for many applications, ranging from imaging to metrology. Photon number correlations in the quantum regime are easy to be produced and are rather robust against unavoidable experimental losses, and noise in some cases, if compared to the entanglement, where loosing one photon can completely compromise the state and its exploitable advantage. Here, we will focus on quantum enhanced protocols in which only phase-insensitive intensity measurements (photon number counting) are performed, which allow probing transmission/absorption properties of a system, leading for example to innovative target detection schemes in a strong background. In this framework, one of the advantages is that the sources experimentally available emit a wide number of pairwise correlated modes, which can be intercepted and exploited separately, for example by many pixels of a camera, providing a parallelism, essential in several applications, like wide field sub-shot-noise imaging and quantum enhanced ghost imaging. Finally, non-classical correlation enables new possibilities in quantum radiometry, e.g. the possibility of absolute calibration of a spatial resolving detector from the on-off-single photon regime to the

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Section: Theory Of Conventional Gimentioning

confidence: 99%

Photon-number correlation for quantum enhanced imaging and sensing

Meda¹,

Losero²,

Samantaray³

et al. 2017

J. Opt.

101

106

View full text Add to dashboard Cite

show abstract

“…This problem is similar to the beam displacement problem analyzed in Ref. [28], where the entire beam is deflected of a certain angle and it is detected by a quadrant detector. The difference is that the structure causing the deflection in our case is more complex, in the sense that at each position of the sample incoming light is deflected at a different angle, or no angle at all, as pictured in figure 1.…”

Section: Introductionmentioning

confidence: 83%

Quantum enhanced imaging of nonuniform refractive profiles

Ortolano

Berchera

Predazzi

2019

Int. J. Quantum Inform.

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In this work quantum metrology techniques are applied to the imaging of objects with a non-uniform refractive spatial profile. A sensible improvement on the classical accuracy is shown to be found when the "Twin Beam State" (TWB) is used. In particular exploiting the multimode spatial correlation, naturally produced in the Parametric Down Conversion (PDC) process, allows a 2D reconstruction of complex spatial profiles, thus enabling an enhanced imaging. The idea is to use one of the spatially multimode beam to probe the sample and the other as a reference to reduce the noise. A similar model can be also used to describe wave front distortion measurements. The model is meant to be followed by a first experimental demonstration of such enhanced measurement scheme.

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“…In recent years, multi-spatial-mode (MSM) quadrature squeezing, which explores the transverse spatial degree freedom of light, has received intensive investigations due to its promising applications in a variety of directions such as quantum entanglement and information [6][7][8][9][10][11][12][13][14][15][16][17], ultra-sensitive measurement of nanometer displacement [18,19], quantum-enhanced metrology like sub-shot-noise or super-resolution quantum imaging imaging [20][21][22][23] and detection of gravitational waves [24][25][26]. In general, MSM squeezing involves a large number of squeezed spatial modes, implying localized spatial squeezing and thus reduction of local intensity fluctuation.…”

mentioning

confidence: 99%

Beam Focusing and Reduction of Quantum Uncertainty in Width at the Few-Photon Level via Multi-Spatial-Mode Squeezing

2019

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We show for the first time that it is possible to realize laser beam focusing at the few-photon level in the four-wave-mixing process, and at the same time, reducing the quantum uncertainty in width. The reduction in quantum uncertainty results directly from the strong suppression of local intensity fluctuations. This surprising effect of simultaneous focusing and reduction of width uncertainty is enabled by multi-spatial-mode squeezing, and is not possible via any classical optical approach or single-spatial-mode squeezing. Our results open promising possibilities for quantum-enhanced imaging, bio-sensing and metrology including measurements of nanometer displacement.

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Ultrasensitive measurement of microcantilever displacement below the shot-noise limit

Cited by 162 publications

References 52 publications

Photon-number correlation for quantum enhanced imaging and sensing

Photon-number correlation for quantum enhanced imaging and sensing

Quantum enhanced imaging of nonuniform refractive profiles

Beam Focusing and Reduction of Quantum Uncertainty in Width at the Few-Photon Level via Multi-Spatial-Mode Squeezing

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