Phys. Rev. Lett. 85, 2925–2928 (2000)Better Schemes for Quantum Interrogation in Lossy ExperimentsReceived 11 February 2000; published in the issue dated 2 October 2000 We show that several schemes exist for improving the efficiency of quantum interrogations (or “interaction-free” measurements), which in principle are limited by lossy experimental components. We show how one new scheme (the “Helstrom” scheme) can efficiently detect the presence of a bomb which has been designed to foil standard quantum interrogations by arming itself when there is high probability of a photon being in the region. This particular new scheme can probe a region of space with a greater probability of success than a person in that region determining they are being probed. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.2925
DOI:
10.1103/PhysRevLett.85.2925
PACS:
42.50.Ar, 03.65.Bz, 03.67.-a, 42.25.Hz
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