AAWSAP DIRD, Quantum Tomography of Negative Energy States in the Vacuum, January 2011

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/ /POK OPPIClltt l:191! 8HL'f
~ . ~ r
H dip-int =ex'® E;(x,t) • g(t) where e is the electron charge and g(t) is a smooth test
(or smearing) function that is equal to 1 during the measurement and smoothly
vanishing elsewhere. Using first-order time -dependent perturbation theory, Marecki [S,
6] derived the probability of excitation:
Pexc(g,1) =J::dr ds g(r)g(s)GU(r-s)(Ei(i, r) E1(1,s)) s , (14)
where G U(r - s) =Jdq(Olx;(r) I~)(~ lx j (s)I0) is the electronic two-point function, rand
s are dummy time and integration variables, and Jdrdsg(r)g(s) is the temporal
sensitivity in the measurement process.
The balanced homodyne detector consists of an arrangement of two photodiodes,
whose outputs are subtracted, and illuminated with an auxiliary coherent state of the
rad iation field (i.e., the loca l oscil lator, LO; see Figure 15) . Per the discussion in
Section IIIB-4, the LO is used as a tool to investigate the properties of a certain state S
of the quantum radiation field under study, and so on a BHD the state Sis optically
mixed with the coherent LO state (see References [5] or [6] for further details). The
quantum field S de-balances the detector (stochastic process of measurement) . The
expectation va lue of the observable corresponding to the electronic charge collected at
the point P in Figure 15 (i.e., the BHD current) is the difference of excitation
r r
probabilities of the two photodiodes [5, 6]: (1)5 = Pexc(g,x )-P.:,Jg,y) , where positions
xand y correspond to the positions .:! and y in Figure 15. Further calculations and
other theoretical considerations lead to the following final result for (l)s [5, 6]:
(J)5 = a e, • f:Lo . • ( E;(i, t0 ) + E;(~,t0 ) ls where Ue/ depends on the electronic structure
of the PIN semiconductor in the photod iode, E{0 is the electric field of the LO
(corresponding to Fin Figure 15), to is the LO phase that can easily be varied in
, r
experiments, and all field operators E;( x, t) are restricted to the frequency ro of the LO.
UNCLASSIFIED/ /FOA Qffl&I.t..k Y§E 8,.L'&'
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