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By virtue of the generalised Hermann--Feynmam theorem we re-derive the energy average formula of photon gas. This is another useful application of the theorem. 相似文献
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This paper realizes a nondestructive and complete Bell-state analysis for atomic qubit systems by a designed nondestructive and complete Bell-state analyser. In the scheme, Bell states are completely discriminated by two bits of classical informations which comes from the locality single atom detection on two auxiliary atoms, during which the Bell states are not affected. The needed devices are well within the bounds of current technology, and then the scheme is experimentally feasible. 相似文献
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This paper solves the newly constructed nonlinear master equation drho /d t =kappa [ 2fleft( Nright) arho (1/fleft( N-1right) )% a^# -a^# arho -rho a^# a] , where f(N) is an operator-valued function of N=a^# a, for describing amplitude damping channel, and derives the infinite operator sum representation of quasi-Kraus operators for the density operator. It also shows that in this nonlinear process the initial pure number state density operator will evolve into the binomial field (a mixed state) when fleft( Nright) =1/sqrtN+1. 相似文献
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