Distinguishing decoherence from alternative quantum theories by dynamical decoupling

Arenz, Christian and Hillier, Robin and Fraas, Martin and Burgarth, Daniel (2015) Distinguishing decoherence from alternative quantum theories by dynamical decoupling. Physical review a, 92 (8). ISSN 1050-2947

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Abstract

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.

Item Type:
Journal Article
Journal or Publication Title:
Physical review a
Additional Information:
©2015 American Physical Society
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3107
Subjects:
ID Code:
74719
Deposited By:
Deposited On:
16 Sep 2015 13:47
Refereed?:
Yes
Published?:
Published
Last Modified:
12 Jul 2020 05:09