The Effect of Intragroup Communication on Preference Shifts in Groups

We use a laboratory gift-exchange game to examine decisions made by groups under three different procedures that dictate how group members interact and reach decisions in comparison to individuals acting alone. We find that group decisions do deviate from those of individuals, but the direction and magnitude of gift exchange depend critically on the procedure. This suggests that no general statements can be made concerning the propensity of groups to exhibit reciprocal or other-regarding behavior relative to individuals. The rules governing how group members can express their preferences and expectations to other group members are critical for determining group outcomes.group behavior, teams, decision making, social preferences

Weak-Light, Zero to -\pi Lossless Kerr-Phase Gate in Quantum-well System via Tunneling Interference Effect

We examine a Kerr phase gate in a semiconductor quantum well structure based on the tunnelling interference effect. We show that there exist a specific signal field detuning, at which the absorption/amplification of the probe field will be eliminated with the increase of the tunnelling interference. Simultaneously, the probe field will acquire a -\pi phase shift at the exit of the medium. We demonstrate with numerical simulations that a complete 180^\circ phase rotation for the probe field at the exit of the medium is achieved, which may result in many applications in information science and telecommunication