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This Defense Intelligence Reference Document, dated 11 January 2011, was prepared by the Defense Intelligence Agency's Defense Warning Office under the Advanced Aerospace Weapons System Applications program. It reviews negative, or sub-vacuum, energy found in the Casimir effect and squeezed light, and describes quantum optical homodyne tomography for measuring it. It proposes balanced homodyne detector systems to map negative energy. It also suggests that arrays of such sensors could detect anomalous aerospace platforms that use engineered spacetime effects for propulsion.
From the source:Release of 2026-09-18 Incident: 1/11/11, Las Vegas, Nevada. Released with redactions. This document is a Defense Intelligence Reference Document (DIRD), a technical reference format used by the Defense Intelligence Agency (DIA) to capture baseline knowledge on a specific topic for later analytic use. DIRDs are best understood as reference and synthesis products rather than as original research. It is one of 38 DIRDs produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP) between 2009 and 2011. Because AAWSAP’s scope permitted a broad range of supporting topics, not every DIRD in the series directly concerns aerospace systems or future threat assessment. The following summary reflects the DIRD’s scope and framing at the time of writing and should not be read as implying current validation of the concepts discussed. This DIRD examines how negative-energy, or “sub-vacuum,” states in quantum fields might be detected and mapped. Its practical scope is limited to the laboratory-scale measurement of minute quantum effects, though it extrapolates from those effects to consider theoretical relevance to concepts such as warp drives, wormholes, or gravitational control. By reviewing previously identified laboratory examples such as the Casimir effect and squeezed light states, the report identifies the core technical challenge as mapping their spatial and temporal structures reliably. To address this, it proposes quantum optical homodyne tomography as a method to reconstruct and quantify the vacuum fluctuations associated with these states. The document acknowledges that only microscopic, transient negative-energy effects have been realized in laboratory settings. It remains unknown whether larger or longer-lived distributions of such effects can be generated or stabilized, particularly given the experimentally unresolved constraints imposed by quantum inequalities. Overall, this DIRD functions as a measurement- and diagnostics-oriented review intended to lay experimental groundwork for a far more ambitious, highly speculative negative-energy research agenda.
UNCLASSIFIED/ /FOA QFFIEJIAL l::ISI! 9Ht'I" where g(ffi) is the Fourier transform of g(t) and is sharply peaked around ffi =0. In general, almost all results of quantum field theory in a vacuum state or under the influence of external conditions (i.e., in vacuum states "deformed" by boundary conditions or external fields) are derivable from the spectral density. This quantity is usually known analytically, and it is of great interest to measure it for interesting quantum field states. Because the ground state is stationary, the quantum noise in the Casimir cavity is time independent, i.e., it is independent of the phase of the LO, and thus the spectral density is also time-independent. Marecki [S, 6] derived the diagonal part of the spectral density for the y-components of the quantum electric field between two parallel, perfectly conducting plates (positioned at x = 0 and x = a) in a Casimir cavity (see Figure 2): r r m3 +<X) cryy(m,x,x) =- L [Q(mnL)-Q(ml 2x-nLI) ] (17)2 4rc n=-CX) for y = 0, where L = 2a is twice the distance between the plates and the function Q(x) is defined as . . Q(x) = sznx + cosx _ sznx. x 2x x3 Note that the diagonal terms of the spectral density are the important quantities to be measured because they will be dominant if the photodiodes are separated by a sufficiently large distance [5, 6]. Spectral densities reveal much finer details of the quantum ground state than already-measured Casimir forces do. By exploring the freedom of choosing the locations of the photodiodes inside the Casimir cavity as well as the polarizations, phases and frequencies of the LO, one can obtain a detailed characterization of one- and two -point functions of any state S of the quantum electric field. Therefore, an application of this particular type of BHD measurement, via Equations (16) and (17), amounts to a tomography of the ground state of the Casimir cavity. For the experimental detection of the Casimir spectral density with a BHD-type device, the Casimir cavity plates are separated by a = 1 micrometers while the photodiodes inside it are of submicrometer width in the x-direction and submillimeter length in the y-direction (see Figure 16). Photodiodes of several nanometers in size have already been constructed and their high quantum efficiency versions are under development, see Reference [60] and the references cited therein for more technical information. As shown in Figure 16, a coherent state in the TEl mode of the Casimir cavity with a very small wavenumber in the y-d irection provides an appropriate LO. A BHD with such a LO and the photodiodes located as shown in Figure 17 would be sensitive only to the y component of the quantum electric field. Figure 18 shows a schematic of the BHD apparatus with a LO. In the figure, the linearly polarized signal field S (if present) is optically mixed with a coherent state (LO), which is polarized orthogonally to S, on the polarizing beam splitter (PBSl). The half wave plate (HWP) reflects the planes of polarization with respect to its optical axis, thereby inducing a n/4 shift of the plane of UNCLASSIFIED/ /fOtt OfflEJIAL l::l§E 8,.LY 39
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