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The conditions for quantum violation of macroscopic realism

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arxiv 0706.0668 v4 pith:MSI6DV6V submitted 2007-06-05 quant-ph

The conditions for quantum violation of macroscopic realism

classification quant-ph
keywords timeclassicalevolutionquantumviolationbecausecoarse-grainedhamiltonians
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Why do we not experience a violation of macroscopic realism in every-day life? Normally, no violation can be seen either because of decoherence or the restriction of coarse-grained measurements, transforming the time evolution of any quantum state into a classical time evolution of a statistical mixture. We find the sufficient condition for these classical evolutions for spin systems under coarse-grained measurements. Then we demonstrate that there exist "non-classical" Hamiltonians whose time evolution cannot be understood classically, although at every instant of time the quantum spin state appears as a classical mixture. We suggest that such Hamiltonians are unlikely to be realized in nature because of their high computational complexity.

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Cited by 2 Pith papers

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