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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.
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UNCLASSIFIED/ /PIHi: 8PPl!ltllt ".JI! OICE I signal a detector L,~ I vacuum ii' local oscillator ( <>Lo) detector Figure 12. Balanced Homodyne Detector Using A Single Effective Fictitious Beam Splitter to Account for Detection Losses and Mode Mismatch. (courtesy of Ulf Leonhardt) The consequence of an effective 11 and Eq. (12) is that the marginal distributions pr(q,8) must become a function of the effective 11 [38]: where the pr(x,8) inside the integral is defined by Eq. (10) and xis a dummy integration variable. Equation (13) defines the measured quadrature histograms that are used to build the transmission profiles in the tomographic process, which is discussed in the following section. Outline of Experimental Procedure The key process of quantum tomography is to picture the "shape" of a quantum object in phase space using the Wigner representation. The marginal distributions [Eq. (10) or (13)] correspond to the tomographic transmission profiles of the Wigner function W(q,p), i.e., to shadows projected onto a line in quantum phase space. Because of the Heisenberg Uncertainty Principle, we cannot measure simultaneously and precisely the position q and the momentum p, and we cannot observe the Wigner function directly as a probability distribution. However, we can measure the quadrature histograms [i.e., the first line in Eq. (10)], and by varying the phase 8 we observe the quantum object under different angles. Given the pr(q,8), the mathematics of computerized tomography can be applied to deduce the Wigner function. 32 UNCLASSIFIED/ /P&tl 9PPI!Itllt ~:!II!! e••tY
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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.