We show that a passing gravitational wave may influence the spin entropy and spin negativity of a system of N massive spin-1/2 particles, in a way that is characteristic of the radiation. We establish the specific conditions under which this effect may be nonzero. The change in spin entropy and negativity, however, is extremely small. Here, we propose and show that this effect may be amplified through entanglement swapping. Relativistic quantum information theory may have a contribution towards the detection of gravitational wave.

This paper investigates discrete and continuous hand-drawn loops and marks in mid-air as a selection input for gesture-based menu systems on optical see-through head-mounted displays (OST HMDs). We explore two fundamental methods of providing menu selection: the marking menu and the loop menu, and a hybrid method which combines the two. The loop menu design uses a selection mechanism with loops to approximate directional selections in a menu system. We evaluate the merits of loop and marking menu selection in an experiment with two phases and report that 1) the loop-based selection mechanism provides smooth and effective interaction; 2) users prioritize accuracy and comfort over speed for mid-air gestures; 3) users can exploit the flexibility of a final hybrid marking/loop menu design; and, finally, 4) users tend to chunk gestures depending on the selection task and their level of familiarity with the menu layout.

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