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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//509 QFFllillllL t!I.JI!! OHLI 12 • (II) '\-,'y,~ I "'V"'"1f'Vy~,i\~\/,t"'\&11.I' -2 Figure 14. Experimentally Measured Squeezed State. (courtesy of P. Marecki) This graph of vacuum dB noise vs. relative optical phase angle shows an experimentally measured squeezed state (plot (I)) and a normal (undisturbed) vacuum state (plot (II)). The deep valleys with negative dB values in plot (I) are sub-vacuum regions with sub-vacuum (negative) energy density (see also, Figure 1 for a comparison). When applied to pulsed sources, the frequency-domain BHD technique implies that averaging over many individual laser pulses takes place. However, in time-domain BHD, each laser pulse generates a signal that is observed in real time and yields a single value of a field quadrature. Repeated measurements of a large number of laser pulses produce a quantum probability distribution associated with this quadrature. When transform-limited LD pulses are used, time-domain BHD gives the complete information about the quantum state in the spatial-temporal mode that matches that of the LO. Hansen et al. [4] point out that time-domain BHD is technically challenging, because 1) the electronics must ensure time resolution of individual laser pulses and 2) the measured quadrature values must not be influenced by low-frequency noise. The detector must provide ultralow noise, high subtraction, and a flat amplification profile in the entire frequency range from DC to at least the LO pulse repetition rate. See Reference [4] for a complete description of their device as shown in Figure 13. 35 UNCLASSIFIED//F81it 8FFiliIAI!: 1!181! &••1::Y
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