Distinguishing decoherence from alternative quantum theories by dynamical decoupling

Christian Arenz*, Robin Hillier, Martin Fraas, Daniel Burgarth

*Corresponding author for this work

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37 Citations (SciVal)
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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.

Original languageEnglish
Article number022102
Number of pages7
JournalPhysical Review A
Issue number2
Publication statusPublished - 03 Aug 2015




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