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https://www.readbyqxmd.com/read/28454137/dynamic-stark-shift-induced-by-a-single-photon-packet
#1
D Valente, F Brito, T Werlang
The dynamic Stark shift results from the interaction of an atom with the electromagnetic field. We show how a propagating single-photon wave packet can induce a time-dependent dynamical Stark shift on a two-level system (TLS). A non-perturbative fully quantum treatment is employed, where the quantum dynamics of both the field and the TLS are analyzed. We also provide the means to experimentally access such time-dependent frequency by measuring the interference pattern in the electromagnetic field inside a 1D waveguide...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28448635/excited-state-dynamics-of-bis-dehydroxycurcumin-tert-butyl-ester-a-diketo-shifted-derivative-of-the-photosensitizer-curcumin
#2
Luca Nardo, Angelo Maspero, Andrea Penoni, Giovanni Palmisano, Erika Ferrari, Monica Saladini
Bis-dehydroxycurcumin tert-butyl ester (K2T23) is a derivative of the natural spice curcumin. Curcumin is widely studied for its multiple therapeutic properties, including photosensitized cytotoxicity. However, the full exploitation of curcumin phototoxic potential is hindered by the extreme instability of its excited state, caused by very efficient non radiative decay by means of transfer of the enolic proton to the nearby keto oxygen. K2T23 is designed to exhibit a tautomeric equilibrium shifted toward the diketo conformers with respect to natural curcumin...
2017: PloS One
https://www.readbyqxmd.com/read/28447975/measurement-of-quantum-interference-in-a-silicon-ring-resonator-photon-source
#3
Jeffrey A Steidle, Michael L Fanto, Stefan F Preble, Christopher C Tison, Gregory A Howland, Zihao Wang, Paul M Alsing
Silicon photonic chips have the potential to realize complex integrated quantum information processing circuits, including photon sources, qubit manipulation, and integrated single-photon detectors. Here, we present the key aspects of preparing and testing a silicon photonic quantum chip with an integrated photon source and two-photon interferometer. The most important aspect of an integrated quantum circuit is minimizing loss so that all of the generated photons are detected with the highest possible fidelity...
April 4, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28446946/neural-imaging-using-single-photon-avalanche-diodes
#4
Mohammad Azim Karami, Misagh Ansarian
INTRODUCTION: This paper analyses the ability of single-photon avalanche diodes (SPADs) for neural imaging. The current trend in the production of SPADs moves toward the minimum dark count rate (DCR) and maximum photon detection probability (PDP). Moreover, the jitter response which is the main measurement characteristic for the timing uncertainty is progressing. METHODS: The neural imaging process using SPADs can be performed by means of florescence lifetime imaging (FLIM), time correlated single-photon counting (TCSPC), positron emission tomography (PET), and single-photon emission computed tomography (SPECT)...
January 2017: Basic and Clinical Neuroscience
https://www.readbyqxmd.com/read/28446793/demonstration-of-shot-noise-limited-swept-source-oct-without-balanced-detection
#5
Vala Fathipour, Tilman Schmoll, Alireza Bonakdar, Skylar Wheaton, Hooman Mohseni
Optical coherence tomography (OCT) has been utilized in a rapidly growing number of clinical and scientific applications. In particular, swept source OCT (SS-OCT) has attracted many attentions due to its excellent performance. So far however, the limitations of existing photon detectors have prevented achieving shot-noise-limited sensitivity without using balanced-detection scheme in SS-OCT, even when superconducting single-photon detectors were used. Unfortunately, balanced-detection increases OCT system size and cost, as it requires many additional components to boost the laser power and maintain near ideal balanced performance across the whole optical bandwidth...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28446622/cortical-venous-redness-represents-tissue-circulation-status-in-patients-with-moyamoya-disease
#6
Toshio Machida, Yoshinori Higuchi, Shigeki Nakano, Satoshi Ishige, Atsushi Fujikawa, Yuichi Akaogi, Junichiro Shimada, Yoichi Yoshida, Sigenori Maru, Junichi Ono
BACKGROUND AND PURPOSE: Venous oxygen saturation (SO2) is measured in medical fields to assess tissue circulation insufficiency. This study aimed to elucidate the use of a cortical venous redness measurement to evaluate hemodynamic changes during revascularization surgery for patients with moyamoya disease. METHODS: In this retrospective case-series analysis, we first quantitatively measured and correlated SO2 and R intensity of 24-bit color digital red-green-blue pictures of blood samples from 3 volunteers...
April 26, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28445648/electron-radiolysis-of-ammonium-perchlorate-a-reflectron-time-of-flight-mass-spectrometric-study
#7
Sándor Góbi, Alexandre Bergantini, Andrew M Turner, Ralf I Kaiser
Thin films of ammonium perchlorate (NH4ClO4) were exposed to energetic electrons at 5.5 K to explore the radiolytic decomposition mechanisms. The effects of radiolysis were monitored on line and in situ via Fourier-transform infrared spectroscopy (FTIR) in the condensed phase along with electron impact ionization quadrupole mass spectrometry (EI-QMS) and single-photon photoionization reflectron time-of-flight mass spectrometry (PI-ReTOF-MS) during the temperature programmed desorption (TPD) phase to probe the subliming molecules...
April 26, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28444638/nuclear-cardiology-are-we-using-the-right-protocols-and-tracers-the-right-way
#8
REVIEW
Maurizio Dondi, Thomas Pascual, Diana Paez, Andrew J Einstein
The field of nuclear cardiology has changed considerably over recent years, with greater attention paid to safety and radiation protection issues. The wider usage of technetium-99m (Tc-99m)-labeled radiopharmaceuticals for single-photon emission computed tomography (SPECT) imaging using gamma cameras has contributed to better quality studies and lower radiation exposure to patients. Increased availability of tracers and scanners for positron emission tomography (PET) will help further improve the quality of studies and quantify myocardial blood flow and myocardial flow reserve, thus enhancing the contribution of non-invasive imaging to the management of coronary artery disease...
April 25, 2017: American Journal of Cardiovascular Drugs: Drugs, Devices, and Other Interventions
https://www.readbyqxmd.com/read/28443612/dynamically-unpolarized-single-photon-source-in-diamond-with-intrinsic-randomness
#9
Naofumi Abe, Yasuyoshi Mitsumori, Mark Sadgrove, Keiichi Edamatsu
Polarization is one of the fundamental properties of light, providing numerous applications in science and technology. While 'dynamically unpolarized' single-photon sources are demanded for various quantum applications, such sources have never been explored. Here we demonstrate dynamically unpolarized single-photon emission from a single [111]-oriented nitrogen- vacancy centre in diamond, in which the single-photon stream is unpolarized, exhibiting intrinsic randomness with vanishing polarization correlation between time adjacent photons...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28442568/direct-counterfactual-communication-via-quantum-zeno-effect
#10
Yuan Cao, Yu-Huai Li, Zhu Cao, Juan Yin, Yu-Ao Chen, Hua-Lei Yin, Teng-Yun Chen, Xiongfeng Ma, Cheng-Zhi Peng, Jian-Wei Pan
Intuition from our everyday lives gives rise to the belief that information exchanged between remote parties is carried by physical particles. Surprisingly, in a recent theoretical study [Salih H, Li ZH, Al-Amri M, Zubairy MS (2013) Phys Rev Lett 110:170502], quantum mechanics was found to allow for communication, even without the actual transmission of physical particles. From the viewpoint of communication, this mystery stems from a (nonintuitive) fundamental concept in quantum mechanics-wave-particle duality...
April 25, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28441368/skeletal-scintigraphy
#11
Jaime L Montilla-Soler, Rikesh Makanji
BACKGROUND: Skeletal scintigraphy remains a valuable tool in the initial and subsequent evaluation of the skeletal system in patients with a diagnosis of primary or metastatic neoplasms. METHODS: We discuss radiopharmaceuticals, nuclear medicine imaging techniques, and current as well as future oncological applications in the adult population. Pertinent literature was reviewed to describe the advantages and limitations of available technologies for the evaluation of skeletal metastatic disease...
April 2017: Cancer Control: Journal of the Moffitt Cancer Center
https://www.readbyqxmd.com/read/28439736/early-cardiac-perfusion-defects-after-left-sided-radiation-therapy-for-breast-cancer-is-there-a-volume-response
#12
REVIEW
Orit Kaidar-Person, Timothy M Zagar, Jorge Daniel Oldan, Jason Matney, Ellen L Jones, Shiva Das, Brian C Jensen, Richard C Zellars, Terence Z Wong, Lawrence B Marks
PURPOSE: Cardiac single-photon emission computed tomography (SPECT) is often used to identify defects in myocardial perfusion due to atherosclerotic coronary artery disease. It was also used in studies to evaluate radiation therapy (RT)-associated cardiac abnormalities. In the current review, we aim to evaluate the rates of post-RT cardiac SPECT early perfusion abnormalities and relate this to the irradiated left ventricular volume. METHODS: The studies cited in this systematic review were identified using the preferred reporting items for systematic reviews and meta-analyses (PRISMA) guidelines...
April 21, 2017: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/28439324/contemporary-diagnostic-imaging-of-oral-squamous-cell-carcinoma-a-review-of-literature
#13
REVIEW
Paulina Pałasz, Łukasz Adamski, Magdalena Górska-Chrząstek, Anna Starzyńska, Michał Studniarek
Oral squamous cell carcinoma (OSCC) is the most common cancer of the oral cavity and constitutes 95% of all cancers of this area. Men are affected twice as commonly as women, primarily if they are over 50 years of age. Forty percent of the lesions are localized in the tongue and 30% in the floor of the oral cavity. OSCC often affects upper and lower gingiva, buccal mucous membrane, the retromolar triangle and the palate. The prognosis is poor and the five-year survival rate ranges from 20% (OSCC in the floor of the mouth) to 60% (OSCC in the alveolar part of the mandible)...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28437951/hot-spot-relaxation-time-current-dependence-in-niobium-nitride-waveguide-integrated-superconducting-nanowire-single-photon-detectors
#14
Simone Ferrari, Vadim Kovalyuk, Wladislaw Hartmann, Andreas Vetter, Oliver Kahl, Changhyoup Lee, Alexander Korneev, Carsten Rockstuhl, Gregory Gol'tsman, Wolfram Pernice
We investigate how the bias current affects the hot-spot relaxation dynamics in niobium nitride. We use for this purpose a near-infrared pump-probe technique on a waveguide-integrated superconducting nanowire single-photon detector driven in the two-photon regime. We observe a strong increase in the picosecond relaxation time for higher bias currents. A minimum relaxation time of (22 ± 1) ps is obtained when applying a bias current of 50% of the switching current at 1.7 K bath temperature. We also propose a practical approach to accurately estimate the photon detection regimes based on the reconstruction of the measured detector tomography at different bias currents and for different illumination conditions...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437948/uv-sensitive-superconducting-nanowire-single-photon-detectors-for-integration-in-an-ion-trap
#15
D H Slichter, V B Verma, D Leibfried, R P Mirin, S W Nam, D J Wineland
We demonstrate superconducting nanowire single photon detectors with 76 ± 4% system detection efficiency at a wavelength of 315 nm and an operating temperature of 3.2 K, with a background count rate below 1 count per second at saturated detection efficiency. We propose integrating these detectors into planar surface electrode radio-frequency Paul traps for use in trapped ion quantum information processing. We operate detectors integrated into test ion trap structures at 3.8 K both with and without typical radio-frequency trapping electric fields...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28436461/photon-phonon-photon-transfer-in-optomechanics
#16
Andrey A Rakhubovsky, Radim Filip
We consider transfer of a highly nonclassical quantum state through an optomechanical system. That is we investigate a protocol consisting of sequential upload, storage and reading out of the quantum state from a mechanical mode of an optomechanical system. We show that provided the input state is in a test-bed single-photon Fock state, the Wigner function of the recovered state can have negative values at the origin, which is a manifest of nonclassicality of the quantum state of the macroscopic mechanical mode and the overall transfer protocol itself...
April 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28435961/single-photon-coulomb-explosion-of-methanol-using-broad-bandwidth-ultrafast-euv-pulses
#17
Itamar Luzon, Krishna Jagtap, Ester Livshits, Oleg Lioubashevski, Roi Baer, Daniel Strasser
Single-photon Coulomb explosion of methanol is instigated using the broad bandwidth pulse achieved through high-order harmonics generation. Using 3D coincidence fragment imaging of one molecule at a time, the kinetic energy release (KER) and angular distributions of the products are measured in different Coulomb explosion (CE) channels. Two-body CE channels breaking either the C-O or the C-H bonds are described as well as a proton migration channel forming H2O(+), which is shown to exhibit higher KER. The results are compared to intense-field Coulomb explosion measurements in the literature...
April 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28434828/correlation-between-single-photon-emission-computed-tomography-and-histopathologic-findings-in-condylar-hyperplasia-of-the-temporomandibular-joint
#18
Rafael Martin-Granizo, José Ma Garcia-Rielo, Oscar De la Sen, Lourdes Maniegas, Alberto Berguer, Manuel De Pedro
PURPOSE: To analyse the correlation between the level of activity measured in the single photon emission computed tomography (SPECT) and the pathological findings in patients with condylar hyperplasia (CH). MATERIALS AND METHODS: All patients evaluated in our department between 2007 and 2014 with a diagnosis of condylar hyperplasia who had undergone SPECT, evidenced signs of activity, and had undergone surgery were included. We included 28 patients, of whom 20 were women and 8 men...
March 24, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28434642/-late-life-depression-or-prodromal-alzheimer-s-disease-which-tools-for-the-differential-diagnosis
#19
A-I Gasser, V Salamin, S Zumbach
INTRODUCTION: Depression and Alzheimer's disease are both very frequent in elderly people. Cognitive deficits are the hallmark of Alzheimer's disease, but they are also common in depressed elderly people who often present cognitive deficits such as memory, attention and executive function problems. On the other hand, people with early Alzheimer's disease demonstrate emotional and behavioral disorders generally encountered in depression such as loss of energy, apathy, mood disorder, and irritability...
April 20, 2017: L'Encéphale
https://www.readbyqxmd.com/read/28434223/ultraclean-single-photon-emission-from-a-gan-quantum-dot
#20
Munetaka Arita, Florian Le Roux, Mark J Holmes, Satoshi Kako, Yasuhiko Arakawa
Wide bandgap III-nitride quantum dots (QDs) are promising materials for the realization of solid-state single-photon sources, especially operating at room temperature. However, so far a large degree of inhomogeneous broadening induced by spectral diffusion has compromised their use. Here, we demonstrate the ultraclean emission from single GaN QDs formed at macro-step edges in a GaN/AlGaN quantum well. As a likely consequence of the high growth temperature and hence a reduced defect density, spectral diffusion is heavily suppressed to levels at least one order of magnitude lower than conventional GaN QDs...
April 24, 2017: Nano Letters
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