Measuring a photonic qubit without destroying it

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dc.creatorPryde, G. J.
dc.creatorO'Brien, J. L.
dc.creatorWhite, A. G.
dc.creatorBartlett, S. D.
dc.creatorRalph, T. C.
dc.date2003-12-05
dc.date.accessioned2026-07-07T11:40:45Z
dc.date.available2026-07-07T11:40:45Z
dc.descriptionMeasuring the polarisation of a single photon typically results in its destruction. We propose, demonstrate, and completely characterise a \emph{quantum non-demolition} (QND) scheme for realising such a measurement non-destructively. This scheme uses only linear optics and photo-detection of ancillary modes to induce a strong non-linearity at the single photon level, non-deterministically. We vary this QND measurement continuously into the weak regime, and use it to perform a non-destructive test of complementarity in quantum mechanics. Our scheme realises the most advanced general measurement of a qubit: it is non-destructive, can be made in any basis, and with arbitrary strength.
dc.description4 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/quant-ph/0312048
dc.identifierhttp://arxiv.org/abs/quant-ph/0312048
dc.identifierPhys.Rev.Lett.92:190402,2004
dc.identifierdoi:10.1103/PhysRevLett.92.190402
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200348
dc.subjectQuantum Physics
dc.titleMeasuring a photonic qubit without destroying it
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