Measuring a photonic qubit without destroying it

G.J. Pryde, JL O'Brien, A.G. White, S.D. Bartlett, T.C. Ralph

Research output: Contribution to journalArticle (Academic Journal)peer-review

120 Citations (Scopus)


A nondeterministic scheme for general measurement of a flying qubit was demonstrated and characterized. The first set of fidelity measures were introduced to characterize the quality of quantum nondemolition (QND) measurement. This measurement uses only linear optics and photodetection of ancillary modes to induce a strong nonlinearity at the single-photon level. It was found that this QND measurement vary continuously into the weak regime and use to perform a nondestructive test of complementarity in quantum mechanics.
Translated title of the contributionMeasuring a photonic qubit without destroying it
Original languageEnglish
Pages (from-to)190402-1 - 190402-4
Number of pages4
JournalPhysical Review Letters
Volume92 (19)
Publication statusPublished - May 2004

Bibliographical note

Publisher: American Physical Society


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