While the increase of infertility all over the world is difficult to assess given the inconsistencies in defining infertility, about 15% of couples have difficulty in conceiving a baby at some point in their lives. At...
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We present further progress, in the form of analytical results, on the Wigner entropy conjecture set forth by Van Herstraeten and Cerf [Phys. Rev. A 104, 042211 (2021)] and Hertz et al. [J. Phys. A: Math. Theor. 50, 3...
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We present further progress, in the form of analytical results, on the Wigner entropy conjecture set forth by Van Herstraeten and Cerf [Phys. Rev. A 104, 042211 (2021)] and Hertz et al. [J. Phys. A: Math. Theor. 50, 385301 (2017)]. Said conjecture asserts that the differential entropy defined for non-negative, yet physical, Wigner functions is minimized by pure Gaussian states while the minimum entropy is equal to 1+lnπ. We prove this conjecture for the qubits formed by Fock states |0〉 and |1〉 that correspond to non-negative Wigner functions. In particular, we derive an explicit form of the Wigner entropy for those states lying on the boundary of the set of Wigner non-negative qubits. We then consider general mixed states and derive a sufficient condition for the conjecture's validity. Lastly, we elaborate on the states which are in accordance with our condition.
Beam-displacement measurements are widely used in optical sensing and communications; however, their performance is affected by numerous intrinsic and extrinsic factors, including beam profile, propagation loss, and r...
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Beam-displacement measurements are widely used in optical sensing and communications; however, their performance is affected by numerous intrinsic and extrinsic factors, including beam profile, propagation loss, and receiver architecture. Here we present a framework for designing a classically optimal beam-displacement transceiver, using quantum estimation theory. We consider the canonical task of estimating the position of a diffraction-limited laser beam after passing through an apertured volume characterized by Fresnel-number product DF. As a rule of thumb, higher-order Gaussian modes provide more information about beam displacement, but are more sensitive to loss. Applying quantum Fisher information, we design mode combinations that optimally leverage this trade-off, and show that a greater than tenfold improvement in precision is possible, relative to the fundamental mode, for a practically relevant DF=100. We also show that this improvement is realizable with a variety of practical receiver architectures. Our findings extend previous works on lossless transceivers, may have immediate impact on applications, such as atomic force microscopy and near-field optical communication, and pave the way towards globally optimal transceivers using nonclassical laser fields.
This paper the concept of the winding number and the computation of the winding number of the digital image in an abstract cellular complex is initiated. The notion of free homotopy on the abstract cellular complex be...
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Cut meshes are a type of mesh that is formed by allowing embedded boundaries to "cut" a simple underlying mesh resulting in a hybrid mesh of cut and standard elements. While cut meshes can allow complex boun...
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Laser–plasma instability(LPI)is one of the main obstacles to achieving predictable and reproducible fusion at high gain through laser-driven inertial confinement fusion(ICF).In this paper,for the first time,we show a...
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Laser–plasma instability(LPI)is one of the main obstacles to achieving predictable and reproducible fusion at high gain through laser-driven inertial confinement fusion(ICF).In this paper,for the first time,we show analytically and confirm with three-dimensional particle-incell simulations that angular incoherence provides suppression of the instability growth rate that is additional to and much stronger than that provided by the well-known temporal and spatial incoherence usually used in ICF *** the model used in our calculations,the maximum field ratio between the stimulated Raman scattering and the driving pulses drops from 0.2 for a Laguerre–Gaussian pulse with a single nonzero topological charge to 0.05 for a super light spring with an angular momentum spread and random relative *** particular,angular incoherence does not introduce extra undesirable hot *** provides a novel method for suppressing LPI by using light with an angular momentum spread and paves the way towards a low-LPI laser system for inertial fusion energy with a super light spring of incoherence in all dimensions of time,space,and angle,and may open the door to the use of longer-wavelength lasers for inertial fusion energy.
Copepods are among the most abundant organisms on the planet and play critical functions in aquatic *** copepods,populations of the Eurytemora affinis species complex are numerically dominant in many coastal habitats ...
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Copepods are among the most abundant organisms on the planet and play critical functions in aquatic *** copepods,populations of the Eurytemora affinis species complex are numerically dominant in many coastal habitats and serve as food sources for major ***,certain populations possess the unusual capacity to invade novel salinities on rapid time *** their ecological importance,high-quality genomic resources have been absent for calanoid copepods,limiting our ability to comprehensively dissect the genome architecture underlying the highly invasive and adaptive capacity of certain ***,we present the first chromosome-level genome of a calanoid copepod,from the Atlantic clade(Eurytemora carolleeae)of the *** species *** genome was assembled using high-coverage PacBio long-read and Hi-C sequences of an inbred line,generated through 30 generations of full-sib *** genome,consisting of 529.3 Mb(contig N50=4.2 Mb,scaffold N50=140.6 Mb),was anchored onto four *** annotation predicted 20,262 protein-coding genes,of which ion transport-related gene families were substantially expanded based on comparative analyses of 12 additional arthropod ***,we found genome-wide signatures of historical gene body methylation of the ion transport-related genes and the significant clustering of these genes on each *** genome represents one of the most contiguous copepod genomes to date and is among the highest quality marine invertebrate *** such,this genome provides an invaluable resource to help yield fundamental insights into the ability of this copepod to adapt to rapidly changing environments.
In many drylands around the globe, vegetation self-organizes into regular spatial patterns in response to aridity stress. We consider the regularly-spaced vegetation bands, on gentle hill-slopes, that survive low rain...
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New stochastic algorithms for solving Laplace equation with mixed-type boundary conditions are considered. Methods of estimation of integrals for the normal derivative of the solution of the equation along the boundar...
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In the radiative Vlasov-Maxwell equations, the Lorentz force is modified by the addition of radiation reaction forces. The radiation forces produce damping of particle energy but the forces are no longer divergence-fr...
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