Unbiased estimation of an optical loss at the ultimate quantum limit with twin-beams

Losero, Elena; Berchera, I. Ruo; Meda, A.; Avella, Alessio; Genovese, M.

doi:10.1038/s41598-018-25501-w

Cited by 64 publications

(74 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1(c). The performance of TWB in loss estimation has been theoretically discussed in [98,99,100,101] and demonstrated experimentally in [88,100,101]. In [101] more than 50% sensitivity improvement with respect to the SNL has been reported, and it reached a 100% improvements when compared with conventional two-beams approach, represented in Fig.…”

Section: Sub-shot-noise Imagingmentioning

confidence: 96%

Quantum imaging with sub-Poissonian light: challenges and perspectives in optical metrology

2019

View full text Add to dashboard Cite

Non-classical correlations in optical beams offer the unprecedented opportunity of surpassing conventional limits of sensitivity and resolution in optical measurements and imaging, especially but not only, when a low photon flux down to the single photons are measured. We review the principles of quantum imaging and sensing techniques which exploit sub-Poissonian photon statistics and non-classical photon number correlation, presenting some state-of-the-art achievements in the field. These quantum photonics protocols have the potential to trigger major steps in many applications, such as microscopy and biophotonics and represent an important opportunity for a new deal in radiometry and photometry.Quantum imaging with sub-Poissonian light Limits of Classical (conventional) imagingMeasuring changes in intensity or in phase of an electromagnetic field, after interacting with matter, is the most simple way to extract relevant information on the properties of a system under investigation, whether a biological sample [18] or a digital memory disc [19].The term "imaging" usually (not always) refers to the reconstruction of the whole spatial properties of the sample, namely in 2D or 3D, and it can be achieved in two different modalities, wide field or point-by-point scanning. Wide field imaging is preferable in many cases, since it provides a more compete dynamic pictures but, for static sample, the point by point scanning offers advantages, for example the better z-resolution in confocal microscopy.In any case, the two parameters quantifying the quality (the amount of information) of the image are the resolution, i.e. the minimum distance at which two points can be distinguished, and the sensitivity, i.e. the minimum measurable variation of the physical quantity in a certain point.The quality of an image is always affected by several limitations, some of them avoidable by a careful design of the experiment (aberration, background, artifacts), others imposed by technical limitations of the available actual technology (for instance unavoidable noise or low efficiency of the detector), and others related to more fundamental reasons. In particular diffraction limit and shot-noise limit represent "fundamental" bounds, to resolution and sensitivity, at least when classical states of light are considered. A possibility to overcome these limitations is offered by peculiar properties of quantum light. Diffraction Limit (DL)The diffraction limit, R 0.61λ/N A (with λ being the wavelength of the light and N A the numerical aperture of the imaging system), represents the maximum obtainable imaging resolution in classical far-field imaging/microscopy. Depending on the kind of light radiation involved, namely incoherent or coherent, it takes the name of Abbe or Rayliegh diffraction limit, respectively.

show abstract

Section: Sub-shot-noise Imagingmentioning

confidence: 96%

Quantum imaging with sub-Poissonian light: challenges and perspectives in optical metrology

2019

View full text Add to dashboard Cite

show abstract

“…However, another optimized estimator was reported [113] that is less sensitive to losses. See [114] for a systematic comparison of this new estimator to estimators previously used. This new estimator was used to demonstrate an absolute (unconditional) quantum advantage in absorption estimation for object presenting absorption up to 50% in spatially single-mode measurements [113].…”

Section: Improved Optical Metrologymentioning

confidence: 99%

Imaging with quantum states of light

et al. 2019

View full text Add to dashboard Cite

The production of pairs of entangled photons simply by focusing a laser beam onto a crystal with a non-linear optical response was used to test quantum mechanics and to open new approaches in imaging. The development of the latter was enabled by the emergence of single photon sensitive cameras able to characterize spatial correlations and high-dimensional entanglement. Thereby new techniques emerged such as the ghost imaging of objectswhere the quantum correlations between photons reveal the image from photons that have never interacted with the object -or the imaging with undetected photons by using nonlinear interferometers. Additionally, quantum approaches in imaging can also lead to an improvement in the performance of conventional imaging systems. These improvements can be obtained by means of image contrast, resolution enhancement that exceed the classical limit and acquisition of sub-shot noise phase or amplitude images. In this review we discuss the application of quantum states of light for advanced imaging techniques.

show abstract

“…On one side we focus on absorption measurements, presenting the work done in [2]. Quantum mechanics laws set the ultimate limit to the sensitivity in this kind of measurement, constrained by the probe mean energy [3].…”

Section: Absorption Measurementmentioning

confidence: 99%

Quantum Enhanced Optical Measurements: From Ultra-High Sensitivity in Absorption Measurements to Ghost Microscopy

Losero

Berchera

Avella

et al. 2019

11th Italian Quantum Information Science Conference (IQIS2018)

Self Cite

View full text Add to dashboard Cite

Quantum enhanced optical measurement protocols aim at reducing the uncertainty in the estimation of some physical quantities of a system below the shot-noise limit, classically unavoidable. In particular when small number of photons is used the shot noise can be the main source of uncertainty, in these cases the use of quantum light is of great interest. Note that there are several situations where the number of photons in the probe can not be increased arbitrarily, as when fragile biological samples are under investigation. Two different imaging protocols are discussed in the following.

show abstract

Unbiased estimation of an optical loss at the ultimate quantum limit with twin-beams

Cited by 64 publications

References 60 publications

Quantum imaging with sub-Poissonian light: challenges and perspectives in optical metrology

Quantum imaging with sub-Poissonian light: challenges and perspectives in optical metrology

Imaging with quantum states of light

Quantum Enhanced Optical Measurements: From Ultra-High Sensitivity in Absorption Measurements to Ghost Microscopy

Contact Info

Product

Resources

About