Abstract
The phenomenon of quantum erasure exposed a remarkable ambiguity in the interpretation of quantum entanglement. On the one hand, the data is compatible with the possibility of arrow-of-time violations. On the other hand, it is also possible that temporal non-locality is an artifact of post-selection. Twenty years later, this problem can be solved with a quantum monogamy experiment, in which four entangled quanta are measured in a delayed-choice arrangement. If Bell violations can be recovered from a “monogamous” quantum system, then the arrow of time is obeyed at the quantum level.
Highlights
We might want to know: given the known types of quantum information, what physical conclusions can be drawn with confidence? Granted, we cannot use quantum erasure to alter the past at will, but can we determine beyond reasonable doubt if quantum systems influence each other across time? What kind of experiments can lead to unequivocal answers to such questions?
If we look at quantum erasure from the point of view of an interpretation with collapse, the “clear” conclusion is that quantum behavior is non-local and retro-causal [16,17]
Quantum mechanics is famous for giving accurate predictions about microscopic observables, without needing to specify the nature of their unobservable interactions
Summary
Changing the number of variables investigated with an n-quantum system can change the expected rates of coincidence This makes it possible to verify: does quantum monogamy happen because four quanta are detected (rather than two), or does it happen because a smaller subset of the data plot is post-selected? It is essential to carry out delayed choice monogamy erasure experiments, because they can elucidate the underlying principles for the analysis of quantum behavior, at least with regard to temporal non-locality This could produce definitive answers to some of the questions that have been debated since the discovery of the Einstein-Podolsky-Rosen (EPR) paradox [6]
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