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This Defense Intelligence Reference Document from the Defense Intelligence Agency is dated 11 January 2011. It was produced in FY 2010 under the Advanced Aerospace Weapons System Applications (AAWSA) Program. It reviews negative, or sub-vacuum, energy found in squeezed light and the Casimir effect, and explains quantum optical homodyne tomography as a way to measure and map that energy in the lab. It proposes balanced homodyne detector arrays that could help detect anomalous aerospace platforms using engineered spacetime propulsion.
UNCLASSIFIED//F811. 8FFll!l*L 1!1!11! l!IIU:!Y between the strength of the negative energy density/flux and the behavior of the detector. It is curious that Davies and Ottewill did not consider using quantum optical homodyne tomography as a tool to test their hypothesis, because this is already a mature experimental discipline. In what follows we outline the basics of quantum optical homodyne tomography and its application to detecting and measuring negative energy density/flux states in squeezed light and in the Casimir effect. Basic Notions of Quantum Optical Homodyne Tomography Tomography, from the Greek word for slice, is a method to infer the shape of a hidden object from its shadows (or projections) under various angles. Quantum tomography is the application of this idea to quantum mechanics. In optical homodyne tomography, the Wigner function or, more generally, the quantum state plays the role of the hidden object. The observable "quantum shadows" are the quadrature distributions and are measured using homodyne detection. From these distributions the Wigner function is reconstructed. See Figure 3 for an illustration of quantum optical homodyne tomography. The vertical 2-dimensional plane seen in the figure is fictitious and is shown for illustrative purposes only. Figure 3. Illustration of Quantum Optical Homodyne Tomography (courtesy of Ulf Leonhardt). The Wigner function (3-dimensional hill on the right) is reconstructed in quantum phase space (gridded plane formed by quadratures q and p) from its experimentally measured projections (curve in vertical 2-dimensional plane), which represents the scanning process of tomography. The vertical axis is the magnitude of the Wigner (quasi probability) function. Quantum tomography was developed for the simple reason that a fundamental feature of quantum mechanics prevents us from seeing physical objects in their full quantum complexity. This is due to the intrinsic fuzziness in the quantum nature of energy and matter according to the Heisenberg Uncertainty Principle, which prevents us from simultaneously and precisely measuring the complementary features (e.g., position and momentum or energy and time) comprising quantum states. For this reason we cannot 16 UNCLASSIFIED/ ,'l"1!11\ l!ll"l"l!l*L 1!181! 8fll!~'
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Report, from the dia collection. The PDF is mirrored here; the original link is above. 51 pages are in the text index: search them above, or from the library's search.