%0 Journal Article
%J Physica Scripta
%D 2010
%T Recycling of qubits
%A P Rapcan
%A Calsamiglia, John
%A MuĂ±oz-Tapia, Ramon
%A Bagan, Emilio
%A V Buzek
%X We consider a finite number, N, of qubits that encode a pure single qubit state SU(2) covariantly. Given the N-qubit state has already been measured optimally to estimate the single-qubit state, we analyse the maximum information obtainable by a second, and subsequent observers ignorant of important details of the previous measurements. We quantify the information acquired by each observer as a function of N and of the number of independent observers that in succession have independently measured the same ensemble of qubits before him.
%B Physica Scripta
%V T140
%P 014059
%U http://iopscience.iop.org/1402-4896/2010/T140/014059?fromSearchPage=true
%R 10.1088/0031-8949/2010/T140/014059