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Distinguishing decoherence from alternative quantum theories by dynamical decoupling

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number022102
<mark>Journal publication date</mark>08/2015
<mark>Journal</mark>Physical review a
Issue number8
Number of pages7
Publication StatusPublished
Early online date3/08/15
<mark>Original language</mark>English


A long-standing challenge in the foundations of quantum mechanics is the verification of alternative collapse theories despite their mathematical similarity to decoherence. To this end, we suggest a method based on dynamical decoupling. Experimental observation of nonzero saturation of the decoupling error in the limit of fast-decoupling operations can provide evidence for alternative quantum theories. The low decay rates predicted by collapse models are challenging, but high-fidelity measurements as well as recent advances in decoupling schemes for qubits let us explore a similar parameter regime to experiments based on macroscopic superpositions. As part of the analysis we prove that unbounded Hamiltonians can be perfectly decoupled. We demonstrate this on a dilation of a Lindbladian to a fully Hamiltonian model that induces exponential decay.

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©2015 American Physical Society