Local Quantum Uncertainty in Two-Qubit Separable States: A Case Study

Recent findings suggest, separable states, which are otherwise of no use in entanglement dependent tasks, can also be used in information processing tasks that depend upon the discord type general non classical correlations. In this work, we explore the nature of uncertainty in separable states as measured by local quantum uncertainty. Particularly in two-qubit system, we find separable X-state which has maximum local quantum uncertainty. Interestingly, this separable state coincides with the separable state, having maximum geometric discord. We also search for the maximum amount of local quantum uncertainty in separable Bell diagonal states. We indicate an interesting connection to the tightness of entropic uncertainty with the state of maximum uncertainty.Comment: 11 pages, 2 figures, latex2e, comments welcome, to appear in qi

On Strong Monogamy Conjecture in Four-Qubit System

Monogamy is a defining feature of entanglement, having far reaching applications. Recently, Regula \textit{et.al.} in Phys. Rev. Lett. \textbf{113}, 110501(2014) have proposed a stronger version of monogamy relation for concurrence. We have extended the strong monogamy inequality for another entanglement measure, viz., negativity. In particular, we have concentrated on four-qubit system and provided a detail study on the status of strong monogamy on pure states. Further, we have analytically provided some classes of states for which negativity and squared negativity satisfy strong monogamy. Numerical evidences have also been shown in proper places. Our analysis also provides cases where strong monogamy is violated.Comment: 8 pages, 8 figures, revtex, comments welcom

48770 (GMR17E04)

dpp enhancer - 48770 Id - GMR17E04 Location 2L: 2428913..2432834 Base pairs – 3921 b

An Undergraduate Cell Biology Lab: Western Blotting to Detect Proteins from Drosophila Eye

We have developed an undergraduate laboratory to allow detection and localization of proteins in the compound eye of Drosophila melanogaster, a.k.a fruit fly. This lab was a part of the undergraduate curriculum of the cell biology laboratory course aimed to demonstrate the use of Western Blotting technique to study protein localization in the adult eye of Drosophila. Western blotting, a two-day laboratory exercise, can be used to detect the presence of proteins of interests from total protein isolated from a tissue. The first day involves isolation of proteins from the tissue and SDS-PAGE (sodium dodecyl sulfate-polyacrylamide) gel electrophoresis to separate the denatured proteins in accordance to their molecular weight/s. The separated proteins are then transferred to the Nitrocellulose or Polyvinylidene difluoride (PVDF) membrane in an overnight transfer. The second day lab involves detection of proteins (transferred to the membrane) using Ponceau-S stain, followed by immunochemistry to detect the protein of interest along the total protein transferred to the membrane. The presence of our protein of interest is carried out by using a primary antibody against the protein, followed by binding of secondary antibody which is tagged to an enzyme. The protein band can be detected by using the kit, which provides substrate to the enzyme. The protein levels can be quantified, compared, and analyzed by calculating the respective band intensities. Here, we have used fly eyes to detect the difference in level of expression of Tubulin (Tub) and Wingless (Wg) proteins in the adult eye of Drosophila in our class. The idea of this laboratory exercise is to: (a) familiarize students with the underlying principles of protein chemistry and its application to diverse areas of research, (b) to enable students to get a hands-on-experience of this biochemical technique