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The principal features in the detection of non-stationary undulatory metric disturbances based on interference effects are considered. The advantage for these the Aharonov–Bohm effect in superconductors in comparison with conventional optical interference is shown. Schemes of interferometric detectors with SQUID are offered.

Recent developments in quantum computation and quantum information theory allow one to extend the scope of game theory for the quantum world. The authors have recently proposed a quantum description of financial market in terms of quantum game theory. This paper contains an analysis of such markets that shows that there are advantages to be gained from using quantum computers and quantum strategies.