Publications by authors named "R Starek"
Metabolic Alkalemia in Hypercalciuria Stone Formers: Does It Matter?
Kidney Blood Press Res
December 2024
Article Synopsis
- - The study examines metabolic alkalemia in outpatients with hypercalciuric nephrolithiasis, noting that these patients often use thiazides, which can cause chloride losses and potentially lead to metabolic imbalances.
- - Data collected from patient records showed that only 4.3% of patients had metabolic alkalemia, primarily those using thiazides, and the daily dosage was higher among those with the condition.
- - The findings highlight the prevalence of hypokalemia (37%) in patients with metabolic alkalemia and indicate lower levels of chloride, magnesium, and ionic calcium, suggesting the need for careful monitoring of these patients despite the low overall prevalence.
Article Synopsis
- * The interaction between the two qubits is controllable through a fixed Hamiltonian, and we show that a measurement and feed-forward approach can significantly boost coherence in the target qubit without compromising its purity.
- * We experimentally validated this protocol with photons, achieving coherence enhancement over several iterations, with successful results observed up to five times.
Generation of particular polarization states of light, encoding information in polarization degree of freedom, and efficient measurement of unknown polarization are the key tasks in optical metrology, optical communications, polarization-sensitive imaging, and photonic information processing. Liquid crystal devices have proved to be indispensable for these tasks, though their limited precision and the requirement of a custom design impose a limit of practical applicability. Here we report fast preparation and detection of polarization states with unprecedented accuracy using liquid-crystal cells extracted from common twisted nematic liquid-crystal displays.
View Article and Find Full Text PDFWeak value amplification is a popular method in quantum metrology for enhancing the sensitivity at the expense of the signal intensity. Recently, it was suggested that the trade-off between signal intensity and sensitivity can be improved by using an entangled auxiliary system. Here, we experimentally investigate such entanglement-assisted weak measurement of small conditional phase shifts induced by an interaction between ancilla and meter qubits.
View Article and Find Full Text PDFQuantum tomography is an essential method of the photonic technology toolbox and is routinely used for evaluation of experimentally prepared states of light and characterization of devices transforming such states. The tomography procedure consists of many different sequentially performed measurements. We present considerable tomography speedup by optimally arranging the individual constituent measurements, which is equivalent to solving an instance of the traveling salesman problem.
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