occasional meanderings in physics' brave new world
- Name: Kea
- Location: New Zealand
Marni D. Sheppeard
Tuesday, July 10, 2007
There have been some interesting sessions this afternoon. I can only mention a couple, since the queue behind me is growing. D. Terno spoke about work with E. Livine on quantum causal histories in the context of quantum information. Causal diagrams are constrained by the requirement that one wants QM to work, and there is a natural way to associate allowable diagrams with standard quantum circuit diagrams. The relevant paper is Phys. Rev. D75 (2007) 084001. Later on M. Tajmar spoke about an observed non-classical frame dragging effect on spinning superconducting rings. Vibrational effects were dealt with using a subtraction technique between clockwise and anticlockwise modes. A question at the end prompted the remark that the observed 'magnetic' interaction between the 4 gyroscopes on Gravity Probe B may be due to this quantum effect.