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In a strongly coupled cavity quantum electrodynamics (QED) system, the second-order correlation function g(τ) of the transmitted probe light from the cavity is determined by the nonlinearity of the atom in the cavity. Therefore, the system provides a platform for controlling the photon statistics by manipulating nonlinearity. In this paper, we experimentally demonstrate nonreciprocal quantum statistics in a cavity QED system with several atoms strongly coupled to an asymmetric optical cavity, which is composed of two mirrors with different transmittivities.
View Article and Find Full Text PDFObservation of Three-Photon Cascaded Emission from Triexcitons in Giant CsPbBr Quantum Dots at Room Temperature.
Nano Lett
October 2024
Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel.
Article Synopsis
- Colloidal semiconductor nanocrystals, particularly giant CsPbBr nanocrystals, show promise for producing time-correlated and entangled photons through cascaded multiexcitonic emissions, despite challenges from nonradiative decay.
- The study demonstrates successful room-temperature spectroscopy of three-photon cascades from triexcitons, revealing strong correlation values that indicate weak binding of excitonic states.
- By analyzing fluorescence lifetimes and photon statistics, the researchers confirm emissions from higher multiexcitonic states and propose ways to control the statistics of emitted photons in future applications.
Development and validation of a noise insertion algorithm for photon-counting-detector CT.
Med Phys
September 2024
Department of Radiology, Mayo Clinic, Rochester, Minnesota, USA.
Background: Inserting noise into existing patient projection data to simulate lower-radiation-dose exams has been frequently used in traditional energy-integrating-detector (EID)-CT to optimize radiation dose in clinical protocols and to generate paired images for training deep-learning-based reconstruction and noise reduction methods. Recent introduction of photon counting detector CT (PCD-CT) also requires such a method to accomplish these tasks. However, clinical PCD-CT scanners often restrict the users access to the raw count data, exporting only the preprocessed, log-normalized sinogram.
View Article and Find Full Text PDFA comparison between the measurement of quantum spatial correlations using qCMOS photon-number resolving and electron multiplying CCD camera technologies.
Sci Rep
June 2024
School of Physics and Astronomy, University of Glasgow, Glasgow, UK.
Cameras with single-photon sensitivities can be used to measure the spatial correlations between the photon-pairs that are produced by parametric down-conversion. Even when pumped by a single-mode laser, the signal and idler photons are typically distributed over several thousand spatial modes yet strongly correlated with each other in their position and anti-correlated in their transverse momentum. These spatial correlations enable applications in imaging, sensing, communication, and optical processing.
View Article and Find Full Text PDFGottesman-Kitaev-Preskill Encoding in Continuous Modal Variables of Single Photons.
Phys Rev Lett
April 2024
Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot, CNRS UMR 7162, 75013 Paris, France.
GKP states, introduced by Gottesman, Kitaev, and Preskill, are continuous variable logical qubits that can be corrected for errors caused by phase space displacements. Their experimental realization is challenging, in particular, using propagating fields, where quantum information is encoded in the quadratures of the electromagnetic field. However, traveling photons are essential in many applications of GKP codes involving the long-distance transmission of quantum information.
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