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Quantum entanglement 1 is a valuable resource in many areas of quantum optics and quantum information processing. One of the most widespread techniques for generating entangled optical states is spontaneous parametric downconversion SPDC 2–5 . SPDC is a second-order nonlinear optical process in which a pump photon is split into a pair of new photons with(More)
The clinical practice of spine navigation has rapidly grown with the development of image-based guidance. In this paper, a brief history of spinal navigation is presented and a review of clinical outcomes for 12,622 pedicle screws placed using the latest technology in the sacral, lumbar and thoracic regions. The clinical evidence demonstrate that(More)
Object localization has applications in many areas of engineering and science. The goal is to spatially locate an arbitrarily shaped object. In many applications, it is desirable to minimize the number of measurements collected while ensuring sufficient localization accuracy. In surgery, for example, collecting a large number of localization measurements(More)
An entanglement-witness approach to quantum coherent-state key distribution and a system for its practical implementation are described. In this approach, eavesdropping can be detected by a change in sign of either of two witness functions: an entanglement witness S or an eavesdropping witness W. The effects of loss and eavesdropping on system operation are(More)
We describe a novel effect involving odd-order dispersion cancellation. We demonstrate that odd- and even-order dispersion cancellation may be obtained in different regions of a single quantum interferogram using frequency-anticorrelated entangled photons and a new type of quantum interferometer. This offers new opportunities for quantum communication and(More)
Using spontaneous parametric down-conversion as a source of correlated photon pairs, correlations are measured between the orbital angular momentum (OAM) in a target beam (which contains an unknown object) and that in an empty reference beam. Unlike previous studies, the effects of the object on off-diagonal elements of the OAM correlation matrix are(More)
David S. Simon,1,2 Nate Lawrence,2 Jacob Trevino,3 Luca Dal Negro,2,3,* and Alexander V. Sergienko2,4,† 1Department of Physics and Astronomy, Stonehill College, 320 Washington Street, Easton, Massachusetts 02357, USA 2Department of Electrical and Computer Engineering & Photonics Center, Boston University, 8 Saint Mary’s St., Boston, Massachusetts 02215, USA(More)
David S. Simon1,2 and Alexander V. Sergienko1,3,4 1Department of Electrical and Computer Engineering, Boston University, 8 Saint Mary’s Street, Boston, Massachusetts 02215, USA 2Department of Physics and Astronomy, Stonehill College, 320 Washington Street, Easton, Massachusetts 02357, USA 3Photonics Center, Boston University, 8 Saint Mary’s Street, Boston,(More)