



@article {2247,
	title = {Resilience of scrambling measurements},
	journal = {Phys. Rev.},
	volume = {A},
	year = {2018},
	month = {2018/06/18},
	chapter = {062113},
	abstract = {<p><span style="font-family: \&quot;Lucida Grande\&quot;, helvetica, arial, verdana, sans-serif; font-size: 14.4px;">Most experimental protocols for measuring scrambling require time evolution with a Hamiltonian and with the Hamiltonian\&$\#$39;s negative counterpart (backwards time evolution). Engineering controllable quantum many-body systems for which such forward and backward evolution is possible is a significant experimental challenge. Furthermore, if the system of interest is quantum-chaotic, one might worry that any small errors in the time reversal will be rapidly amplified, obscuring the physics of scrambling. This paper undermines this expectation: We exhibit a renormalization protocol that extracts nearly ideal out-of-time-ordered-correlator measurements from imperfect experimental measurements. We analytically and numerically demonstrate the protocol\&$\#$39;s effectiveness, up to the scrambling time, in a variety of models and for sizable imperfections. The scheme extends to errors from decoherence by an environment.</span></p>},
	doi = {https://doi.org/10.1103/PhysRevA.97.062113},
	url = {https://arxiv.org/abs/1802.01587},
	author = {Brian Swingle and Nicole Yunger Halpern}
}
