1,721,059 research outputs found
Long-term outcome after totally thoracoscopic ablation for atrial fibrillation: Are we integrating all the therapies in the treatment of (longstanding-) persistent or postablation atrial fibrillation?
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Statistical characterization of discrete amplitude-modulated coherent states at telecom wavelengths by means of an up-conversion-based photon-number-resolving detector
Full text linkThe successful implementation of quantum communication protocols relies on the proper encoding of information in the degrees of freedom of the employed optical states. Particular interest is devoted to amplitude-phase-shift keying coherent states, which can provide robust solutions in satellite communication systems and guarantee high values of channel capacity. In this work, we implement a sum-frequency-based photon-number-resolving detector, capable of revealing discrete amplitude modulation of coherent states produced at telecom wavelengths. The detection is performed in the visible spectral range and in the photon-number-resolving domain, thus encouraging the use of more complex alphabets in which both amplitude and phase vary
Hybrid discrimination strategy in quantum communication based on photon-number-resolving detectors and mesoscopic twin-beam states
Full text linkState discrimination is a key challenge in the implementation of quantum communication protocols. Most optical communication protocols rely on either coherent states of light or fragile single-photon states, making it often difficult to achieve robustness and security simultaneously. In this work, we propose a hybrid strategy that operates in the mesoscopic intensity regime, leveraging robust quantum states of light. Our approach combines classical and quantum features: reliable state discrimination based on a classical property of light, and security stemming from nonclassical correlations. Specifically, the receiver uses photon-number-resolving detectors to access the mean photon number of the binary thermal signals encoding the information. The communication channel exploits twin-beam states, inherently sensitive to eavesdropping attacks, to provide a layer of security. This strategy is scalable, allowing for straightforward extension to more complex signal alphabets, and offers a promising route for robust and secure quantum communication in the mesoscopic intensity domain
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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