Recycling of qubits
| Authors | |
|---|---|
| Year of publication | 2010 |
| Type | Article in Periodical |
| Magazine / Source | Physica Scripta |
| MU Faculty or unit | |
| Citation | |
| Web | http://iopscience.iop.org/1402-4896/2010/T140/014059/ |
| Field | Informatics |
| Keywords | Quantum information processing; qubits |
| Description | 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. |
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