Recycling of qubits

P. Rapčan*, J. Calsamiglia, R. Mũoz-Tapia, E. Bagan, V. Bužek

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)


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.

Original languageEnglish
Article number014059
JournalPhysica Scripta T
Publication statusPublished - 2010


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