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This Defense Intelligence Reference Document, dated 30 March 2010, was prepared by the Defense Intelligence Agency's Defense Warning Office under its Advanced Aerospace Weapon System Applications Program. It reviews quantum entanglement, nonlocality and EPR experiments, and asks whether nonlocal quantum effects could carry observer-to-observer signals faster than light. The paper describes proposed experiments and an example of real-time Earth control of a Mars rover. It concludes that there is no compelling answer yet and that experimental tests are needed.
From the source:Release of 2026-09-18 Incident: 3/30/10, 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 reviews quantum entanglement and nonlocality with a focus on whether those phenomena might be usable as a means of faster-than-light communication between observers, especially for real-time space operations over interplanetary distances. The report surveys the relevant quantum experiments and no-signal theorems, then examines proposed communication schemes based mainly on momentum-entangled photons, including scenarios involving superluminal and retro-causal signaling. However, it repeatedly acknowledges that the central question remains unresolved experimentally, and it gives substantial attention to the coherence-versus-entanglement tradeoff and other features of standard quantum mechanics that may prevent usable signaling even if non-local correlations are experimentally validated. Overall, the document is an exploratory analysis of whether quantum nonlocality could conceivably support a practical communications application rather than a demonstration of prospective utility.
UNCLASSIFIED/ /P81t errl@IAL ~SI! 8HL'I VIII. Superluminal and Retrocausal Nonlocal Communication As mentioned in the previous section, we will assume for the sake of discussion that nonlocal signaling is possible and will consider its implications for the speed of transmission of signals. For definiteness, schemes for doing this are based on the slit imaging coincidence-free version of the Ghost Interference experiment described above and shown in Figure 7. In that system, the instant at which a nonlocal signal is sent is the arrival of the VLP photon at the fiber-optic system on the left, and the instant at which the signal is received is the arrival of the HLP photon at the camera at the bottom of the diagram. Assuming the workability of this scheme, both the instants of sending and of receiving can be delayed, in principle, by the introduction of delay paths-for example, runs of fiber-optic cables-in the system. In particular, the "send" instant could be made to occur well after the "receive" instant in the system, constituting a direct demonstration of retrocausal signaling. This is shown in Figure 10. Here the cleanup two-slit system S2 becomes the entrance for two 10-km-long runs of fiber-optics that are carefully matched to have identical exit phases at SJ, the end of the fiber runs where the light enters the optical switching arrangement described above. If the index of refraction of the fiber is 1.5, light transiting the 10-km path requires about 50 μs. In the presence of detection noise or the degradation of pattern visibility because of compromises between entanglement and coherence, considerably more photon detection events-say 100-might be required. 10km Apertures 10km Image Slits Path lo Lens = f IR Pass Filler HIJ> 702 nm 0!¥ctSlits BBO VLP JSI nm Path to Lens= f S1 Camera u 1 n [/SJ Figure 10. Slit-Imaging Coincidence-Free Version of the Ghost Interference Experiment Demonstrating Superluminal and Retrocausal Signaling UNCLASSIFIED/ /FOlil OFFI&il.t.k W&lii 8Nk¥ 17
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