Ulvi Yurtsever

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For a large class of quantum states, all local (pointwise) energy conditions widely used in relativity are violated by the renormalized stress-energy tensor of a quantum field. In contrast, certain nonlocal positivity constraints on the quantum stress-energy tensor might hold quite generally, and this possibility has received considerable attention in(More)
We address the problem of identifying underground anomalies (e.g holes) based on gravity measurements.Our approach makes general assumptions about the shape of the hole, e.g that it can described by few wavelet coefficients. Such assumptions are known under the name of sparsity assumptions. Based on the recently developed compressed sensing (CS) methodology(More)
We discuss some mathematical aspects of the problem of inverting gravitational field data to extract the underlying mass distribution. While the forward problem of computing the gravity field from a given mass distribution is mathematically straightforward, the inverse of this forward map has some interesting features that make inversion a difficult(More)
We devise a new technique to enhance transmission of quantum information through linear optical quantum information processors. The idea is based on applying the Quantum Zeno effect to the process of photon absorption. By frequently monitoring the presence of the photon through a quantum non-demolition (QND) measurement the absorption is suppressed. Quantum(More)