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This Defense Intelligence Reference Document (DIA-08-1003-016), dated 30 March 2010 and produced by the Defense Intelligence Agency under its Advanced Aerospace Weapon System Applications (AAWSA) Program, reviews quantum entanglement and nonlocality. It asks whether they could carry observer-to-observer signals faster than light or backward in time, with real-time control of a Mars rover as an example. It finds no compelling answer yet and says the question must be settled by experiment.
UNCLASSIFIED/ ,'P8R 8ffl8Iilrt Wili &HLY time standing wave (l!"l'*) between the locations (for example, a photon source and a photon detector). After an initial exchange of offer and confirmation waves, a particular transaction is selected probabilistically from all that are possible, based on the tJltJI* values of the alternatives. The offer/confirmation exchange continues until all the conserved quantities (energy, momentum, angular momentum, and so forth) have been transferred. For the nonlocal communication test system described above, we will consider two cases: • Case 1: The switch is positioned so that each fiber from the slits is routed to one detector, producing a "which-way" measurement of the slit through which the VLP photon passed. In this case, the HLP photon as detected by the camera should have a recorded position that falls on a broad single-slit-diffraction-pattern distribution, (not a two-slit interference pattern). • Case 2: The switch is positioned so that light from the two fibers is combined before detection. Therefore, the detection produces no information on the path of VLP photon, which could have passed through either slit. In this case, the HLP photon detected by the camera should be in a position that falls on a two-slit interference pattern distribution. Figure 8 shows the transaction that forms for the nonlocal communication test system in the Case 1 configuration. Here, as in the Ghost Interference experiment, we have treated the nonlinear crystal source of entangled pairs as an effective "reflector" and have represented the rays with straight-through paths to "unfold" the system, duplicating the lens for each photon and representing the system as two-lens optical imaging, with nearly parallel rays between the two lenses. Slit systems S1 and S2 are located one focal length f away from the lenses. The left-going photon is assumed to arrive at the upper slit of S2 and to be detected by the upper detector (circled). The momentum-entangled right-going photon must then go to S1, which is the optical image of S2, and be diffracted by the slit and detected by the camera. If Figure 8 were vertically inverted, it would provide a similar diagram for the equally probable arrival of the left-going photon at the lower slit of S2 and detection by the lower detector. The three stages of transaction formation are shown. 14 UNCLASSIFIED/ /f8R 8fPI@Itllt ""I! one I
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