|Title:||Experimental observation of a topological phase in the maximally entangled state of a pair of qubits|
|Abstract:||Quantum mechanical phase factors can be related to dynamical effects or to the geometrical properties of a trajectory in a given space—either parameter space or Hilbert space. Here, we experimentally investigate a quantum mechanical phase factor that reflects the topology of the SO(3) group: since rotations by pi around antiparallel axes are identical, this space is doubly connected. Using a pair of nuclear spins in a maximally entangled state, we subject one of the spins to a cyclic evolution. If the corresponding trajectory in SO(3) can be smoothly deformed to a point, the quantum state at the end of the trajectory is identical to the initial state. For all other trajectories the quantum state changes sign.|
|Rights:||©2007 The American Physical Society|
|Publisher:||The American PHysical Society|
|Citation:||Du, J.; Zhu, J.; Shi, M.; Peng, X.; Suter, D.: Experimental observation of a topological phase in the maximally entangled state of a pair of qubits. In: Physical Review A Jg. 76(2007), 042121.|
|Appears in Collections:||Suter, Dieter Prof. Dr.|
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