Discrimination of correlated and entangling quantum channels with selective process tomography

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Abstract

The accurate and reliable characterization of quantum dynamical processes underlies efforts to validate quantum technologies, where discrimination between competing models of observed behaviors inform efforts to fabricate and operate qubit devices. We present a protocol for quantum channel discrimination that leverages advances in direct characterization of quantum dynamics (DCQD) codes. We demonstrate that DCQD codes enable selective process tomography to improve discrimination between entangling and correlated quantum dynamics. Numerical simulations show selective process tomography requires only a few measurement configurations to achieve a low false alarm rate and that the DCQD encoding improves the resilience of the protocol to hidden sources of noise. Our results show that selective process tomography with DCQD codes is useful for efficiently distinguishing sources of correlated crosstalk from uncorrelated noise in current and future experimental platforms.

Original languageEnglish
Article number042107
JournalPhysical Review A
Volume94
Issue number4
DOIs
StatePublished - Oct 10 2016

Funding

This work was supported by a grant from the Intelligence Community Postdoctoral Research Fellowship program to the University of Tennessee.

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