Continuous input nonlocal games

We present a family of nonlocal games in which the inputs the players receive are continuous. We study three representative members of the family. For the first two a team sharing quantum correlations (entanglement) has an advantage over any team restricted to classical correlations. We conjecture that this is true for the third member of the family as well.     

Superluminal tunnelling times as weak values

Abstract

We consider the tunnelling particle as a pre- and post-selected system and prove that the tunnelling time is the expectation value of the position of a ‘clock’ degree of freedom weakly coupled to it. Such a value, called a ‘weak value’, typically falls outside the eigenvalue spectrum of the operator. The appearance of unusual weak values has been associated with a unique interference structure called ‘superoscillations’ (band-limited functions which on a finite interval, approximate functions with spectra well outside their band). It is proposed that superoscillations play an important role in the interferences which give rise to superluminal effects. To demonstrate that, we consider a certain simple tunnelling barrier which allows a wave packet to travel in zero time and negligible distortion, a distance arbitrarily longer than the width of the wave packet. The peak is shown to result from a superoscillatory superposition at the tail. Similar reasoning applies to the dwell time. For this system, both the Wigner time (related to the group velocity) and a clock time correspond to superluminal velocities.     

Instantaneous measurements of nonlocal variables

Abstract

Relativistic causality imposes rigid restrictions on nondemolition (repeatable) measurements of nonlocal variables. We show that there are no causal restrictions on demolition (nonrepeatable) measurements: all Hermitian operators of multipartite quantum system can be measured instantaneously, provided unlimited supply of entanglement resources.     

Vicissitudes of the impetus for growth and change among emerging adults.

The aim of this study was to understand why some emerging adults pursue their goals in effective ways while others become involved in projects or set goals that collapse after a period of time. In order to examine the inner processes which may explain this phenomenon, in-depth interviews were conducted with 70 emerging adults aged 21 to 26. The interviews revealed two main modes in the pursuit of goals among emerging adults. In the "doing-oriented" mode, individuals were extensively invested in a constant pursuit for its own sake, hardly thinking about what they do, and why. In contrast, in the "reflective-oriented" mode, emerging adults were highly reflective about their behaviors, motivations, and future projected plans. Integrating developmental and psychoanalytic thinking, our data propose new understandings of the inner processes through which emerging adults may experience and direct their lives. (PsycINFO Database Record (c) 2010 APA, all rights reserved)