Title | Recycling of qubits |
Publication Type | Journal Article |
Year of Publication | 2010 |
Authors | Rapcan, P, Calsamiglia, J, Muñoz-Tapia, R, Bagan, E, Buzek, V |
Journal | Physica Scripta |
Volume | T140 |
Pagination | 014059 |
ISSN | 0031-8949 |
Abstract | 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. |
URL | http://iopscience.iop.org/1402-4896/2010/T140/014059?fromSearchPage=true |
DOI | 10.1088/0031-8949/2010/T140/014059 |
