Author
C. G. Parazzoli
Bio: C. G. Parazzoli is an academic researcher. The author has contributed to research in topics: Photon & Interferometry. The author has an hindex of 3, co-authored 3 publications receiving 73 citations.
Topics: Photon, Interferometry, Light beam, Light field, Laser beam quality
Papers
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20 Apr 2017
TL;DR: In this paper, the authors proposed and implemented a procedure for enhancing the sensitivity with which one can determine the phase shift experienced by a thermal light beam possessing on average fewer than four photons in passing through an interferometer.
Abstract: We propose and implement a procedure for enhancing the sensitivity with which one can determine the phase shift experienced by a thermal light beam possessing on average fewer than four photons in passing through an interferometer. Our procedure entails subtracting exactly one (which can be generalized to m) photon from the light field exiting an interferometer containing a phase-shifting element in one of its arms. As a consequence of the process of photon subtraction, the mean photon number and signal-to-noise ratio (SNR) of the resulting light field are increased, leading to an enhancement of the SNR of the interferometric signal for that fraction of the incoming data that leads to photon subtraction.
36 citations
TL;DR: In this paper, a quantum procedure for enhancing the sensitivity with which one can determine the phase shift experienced by a weak light beam possessing thermal statistics in passing through an interferometer was proposed.
Abstract: We propose and implement a quantum procedure for enhancing the sensitivity with which one can determine the phase shift experienced by a weak light beam possessing thermal statistics in passing through an interferometer. Our procedure entails subtracting exactly one (which can be generalized to m) photons from the light field exiting an interferometer containing a phase-shifting element in one of its arms. As a consequence of the process of photon subtraction, and somewhat surprisingly, the mean photon number and signal-to-noise ratio of the resulting light field are thereby increased, leading to enhanced interferometry. This method can be used to increase measurement sensitivity in a variety of practical applications, including that of forming the image of an object illuminated only by weak thermal light.
32 citations
Patent•
18 Jan 2010
TL;DR: In this paper, a method and apparatus for steering a radio frequency beam is presented, where the radio frequency is emitted from an array of antenna elements at a first angle into a lens at a location for the lens.
Abstract: A method and apparatus are present for steering a radio frequency beam. The radio frequency beam is emitted from an array of antenna elements at a first angle into a lens at a location for the lens. The first angle of the radio frequency beam is changed to a second angle when the radio frequency beam exits the lens. The second angle changes when the location at which the radio frequency beam enters the lens changes. The second angle of the radio frequency beam is changed to a third angle when the radio frequency beam with the second angle passes through a negative index metamaterial lens located over the lens.
14 citations
Cited by
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Patent•
03 Dec 2012
TL;DR: In this paper, the authors present a system, methods, and devices for consumers using RFID-tagged items for multichannel shopping using smartphones, tablets, and indoor navigation.
Abstract: The present invention relates to systems, methods, and devices for consumers using RFID-tagged items for multichannel shopping using smartphones, tablets, and indoor navigation, preservation of consumer's privacy related to RFID-tagged items that they leave a retail store with, and automatically reading and locating retail inventory without directly using store labor. Robots and aerial mobile automated RFID reading devices are disclosed.
76 citations
TL;DR: For the resolution of two sub-Rayleigh sources, the new methods have been shown theoretically and experimentally to outperform direct imaging and approach the true quantum limits.
Abstract: The wave-particle duality of light introduces two fundamental problems to imaging, namely, the diffraction limit and the photon shot noise. Quantum information theory can tackle them both in one ho...
67 citations
TL;DR: In this paper, the effects of the initial photon statistics on those of the state from which the photons have been subtracted or to which they have been added are analyzed based on two closely related moment-generating functions.
Abstract: The subtraction or addition of a prescribed number of photons to a field mode does not, in general, simply shift the probability distribution by the number of subtracted or added photons. Subtraction of a photon from an initial coherent state, for example, leaves the photon statistics unchanged and the same process applied to an initial thermal state increases the mean photon number. We present a detailed analysis of the effects of the initial photon statistics on those of the state from which the photons have been subtracted or to which they have been added. Our approach is based on two closely related moment-generating functions, one that is well established and one that we introduce.
59 citations
TL;DR: In this article, the authors used conditional measurements to engineer the excitation mode of the field through the simultaneous subtraction of photons from two-mode squeezed vacuum states, leading to a family of quantum-correlated multiphoton states with tunable mean photon numbers and degree of correlation.
Abstract: The quantum theory of electromagnetic radiation predicts characteristic statistical fluctuations for light sources as diverse as sunlight, laser radiation, and molecule fluorescence. Indeed, these underlying statistical fluctuations of light are associated with the fundamental physical processes behind their generation. In this contribution, we experimentally demonstrate that the manipulation of the quantum electromagnetic fluctuations of two-mode squeezed vacuum states leads to a family of quantum-correlated multiphoton states with tunable mean photon numbers and degree of correlation. Our technique relies on the use of conditional measurements to engineer the excitation mode of the field through the simultaneous subtraction of photons from two-mode squeezed vacuum states. The experimental generation of nonclassical multiphoton states by means of photon subtraction unveils novel mechanisms to control fundamental properties of light. As a remarkable example, we demonstrate the engineering of a quantum state of light with up to ten photons, exhibiting nearly Poissonian photon statistics, that constitutes an important step towards the generation of entangled lasers. Our technique enables a robust protocol to prepare quantum states with multiple photons in high-dimensional spaces and, as such, it constitutes a novel platform for exploring quantum phenomena in mesoscopic systems.
52 citations
Patent•
25 Feb 2009
TL;DR: In this article, the negative index metamaterial lens is formed from the designed negative index unit cells, which are selected for the discrete components of a negative index materials lens to bend a beam generated by the phased array antenna to around 90 degrees from a vertical orientation to form an initial design.
Abstract: A method and apparatus for a negative index metamaterial lens. The method is used for creating a negative index metamaterial lens for use with a phased array antenna. A design is created for the negative index materials lens that is capable of bending a beam generated by the phased array antenna to around 90 degrees from a vertical orientation to form an initial design. The initial design is modified to include discrete components to form a discrete design. Materials are selected for the discrete components. Negative index metamaterial unit cells are designed for the discrete components to form designed negative index metamaterial unit cells. The designed negative index metamaterial unit cells are fabricated to form fabricated designed negative index metamaterial unit cells. The negative index metamaterial lens is formed from the designed negative index metamaterial unit cells.
46 citations