Phys. Rev. Lett. 92, 190402 (2004) [4 pages]Measuring a Photonic Qubit without Destroying ItReceived 5 December 2003; published 12 May 2004 Measuring the polarization of a single photon typically results in its destruction. We propose, demonstrate, and completely characterize a quantum nondemolition (QND) scheme for realizing such a measurement nondestructively. This scheme uses only linear optics and photodetection of ancillary modes to induce a strong nonlinearity at the single-photon level, nondeterministically. We vary this QND measurement continuously into the weak regime and use it to perform a nondestructive test of complementarity in quantum mechanics. Our scheme realizes the most advanced general measurement of a qubit to date: it is nondestructive, can be made in any basis, and with arbitrary strength. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.190402
DOI:
10.1103/PhysRevLett.92.190402
PACS:
03.65.Ta, 03.67.–a, 42.50.Xa
See AlsoReply: G. J. Pryde, J. L. O’Brien, A. G. White, S. D. Bartlett, and T. C. Ralph, Pryde et al. Reply:, Phys. Rev. Lett. 95, 048902 (2005). Reply: Pieter Kok and William J. Munro, Comment on “Measuring a Photonic Qubit without Destroying It”, Phys. Rev. Lett. 95, 048901 (2005). |
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