11,605 research outputs found
Decomposition of SU(N) connection and Effective Theory of SU(N) QCD
We give a general decomposition of SU(N) connection and derive a generalized
Skyrme-Faddeev action as the effective action of SU(N) QCD in the low energy
limit. The result is obtained by separating the topological degrees which
describes the non-Abelian monopoles from the dynamical degree of gauge
potential, and integrating all the dynamical degrees of SU(N) QCD.Comment: retex, 7 page
Criterion on remote clocks synchronization within a Heisenberg scaling accuracy
We propose a quantum method to judge whether two spatially separated clocks
have been synchronized within a specific accuracy . If the measurement
result of the experiment is obviously a nonzero value, the time difference
between two clocks is smaller than ; otherwise the difference is beyond
. On sharing the 2-qubit bipartite maximally entangled state in this
scheme, the accuracy of judgement can be enhanced to
. This criterion is consistent with Heisenberg
scaling that can be considered as beating standard quantum limit, moreover, the
unbiased estimation condition is not necessary.Comment: 5 pages, 1 figur
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