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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/ /FOR OFFI@IAk WSli OPtklf Contents Foreword and Introduction ....................................................................................iv I. Quantum Entanglement, Nonlocality, and EPR Experiments ............................... 1 II. The Quantum No-Signal Theorems .................................................................... 4 III. Nonlocality Versus Special Relativity? ............................................................. 5 IV. Momentum Domain Entanglement and EPR Experiments .................................. 5 V. Coherence-Entanglement Complementarity ..................................................... 10 VI. Nonlocal Communication Versus Signaling ..................................................... 11 VII. A Transactional Analysis of the Nonlocal Communication Test ...................... 13 VIII. Superluminal and Retrocausal Nonlocal Communication ............................. 17 IX. Paradoxes and Nonlocal Communication ........................................................ 18 X. Superluminal Communication without Paradoxes ............................................ 19 XI. Example: Real-Time Earth Control of Mars Rover............................................ 20 XII. Another Superluminal Possibility: Nonlinear Quantum Mechanics................. 22 XIII. Conclusion ................................................................................................... 23 Appendix: Glossary .............................................................................................. 24 Figures Figure 1. Schematic of the 1972 Freedman-Clauser Experiment ............................ 2 Figure 2. Schematic of the 1995 Ghost Interference Experiment of the Shih Figure 7. Slit-Imaging Coincidence-Free Version of the Ghost Interference Group ...................................................................................................... 6 Figure 3. Ghost Interference Position Distributions at X2 ....................................... 7 Figure 4. "Unfolding" the Ghost Interference Experiment ...................................... 8 Figure 5. Schematic of the 1998 Dopfer Experiment .............................................. 9 Figure 6. Thick-Source Effect ............................................................................... 10 Experiment to Demonstrate Nonlocal Communication ........................... 12 Figure 8. Transactional Interpretation Diagrams for Case 1 ................................. 15 Figure 9. Transactional Interpretation Diagrams for Case 2 ................................. 16 UNCLASSIFIED/ /FOR OFFI@I.t.k WSli 8Ptklf ii
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