Weakly Measured Correlations of Spin-1/2 Particles as a Communications Approach
- Paper number
IAC-08.B2.4.9
- Author
Mr. Roger X. Lenard, Sandia National Laboratories, United States
- Year
2008
- Abstract
Recent work by Dopfer employing correlated measurement of parametrically down-converted photons have been analyzed by Cramer and Woodward who propose a means to extend the experiment to allow for potential communications using a more rigid experimental formalism to eliminate the coincidences. Recent papers by the authors have indicated that a time-varying magnetic field introduced between two entangled spin- ½particles might provide a means of detecting variations in the spin precession rates; consequently, providing a potential means for communications. Smith, et.al., propose a weak measurement approach to perform efficient quantum state estimation. This latter approach employs a time-varying magnetic field and a tensor light shift to perform geometric rotations of the ensembles. Work by Aharanov and Maclay indicate that field coupled spin – ½ particles might be used for local communications within the range of the dipole-dipole interaction. Cramer mentions the issue of retro-causal information transfer if super-luminal information transfer is present. In order to address the causal considerations, the authors assess the potential for communications using an impressed field similar to the Smith approach on causally separated spin – ½ entities using the causal interpretation. The work of Dewdney, et.al, indicates that these interactions are non-local in nature, although they do not admit the potential for communications because of retro-causal considerations. Holland also concurs with this assessment. The issue remains that the particles can be cross-correlated, and if the time-varying component of the field is evidenced between the two particles, then a communication carrier is available for exploitation. The authors start with the Stern-Gerlach analysis of Dewdney, eliminating the position dependence, but retaining the causal relationship. The authors extend the analysis to show conditions under which the precession component is preserved during a weak measurement process and could potentially be correlated for a communication channel. The authors review current experimental procedures and subsequently propose a potential experimental approach to test the analytical methodology. While the experimental approach is fairly conceptual at this juncture, it implies that existing equipment may be capable of determining whether or not causal correlations between entangled systems can be used for communications. Recent work has extended last year’s paper to analyze the use of a classic channel to maintain entanglement over long time periods. We also explicitly analyze the causal quantum torque interactions between the two particles in order to predict the field translation effects between the two particles.
- Abstract document
- Manuscript document
IAC-08.B2.4.9.pdf (🔒 authorized access only).
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