![]() ![]() I am thinking of showing and hiding the below div to indicate progress How to identify when the download is completed so as to hide the animation. The download progress bar animation should start with click of "download" button. Our results connect quantum simulation with quantum metrology by unveiling the squeezing power of a large variety of Hamiltonian dynamics that are currently implemented by different quantum simulation platforms.How to implement a download progress bar or an animation gif indicating file downloading in progress on an MVC4 page. ![]() The full squeezing evolution of the planar-rotor model is seemingly reproduced for interactions decaying with distance r as r − α when α < 5 d / 3 in d dimensions. Our central insight is that starting from a coherent spin state, a generic U(1)-symmetric Hamiltonian featuring the Anderson's tower of states generates the same squeezing evolution at short times as the one governed by the paradigmatic one-axis-twisting (or planar-rotor) model of squeezing dynamics. Such states are fundamentally related to the appearance of spontaneous symmetry breaking in quantum systems and, for models with sufficiently high connectivity, they are parametrically close to the eigenstates of a planar rotor (Dicke states), in that they feature an anomalously large value of the total angular momentum. Here we show that robust (i.e., persistent) squeezing dynamics is generated by a very large class of S = 1 / 2 spin Hamiltonians with axial symmetry, in relationship with the existence of a peculiar structure of the low-lying Hamiltonian eigenstates-the so-called Anderson's tower of states. Spin squeezing-a central resource for quantum metrology-can be generated via the nonlinear, entangling evolution of an initially factorized spin state. ![]()
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