Conditional Hybrid Nonclassicality
Abstract
We derive and implement a general method to characterize the nonclassicality in compound discrete- and continuous-variable systems. For this purpose, we introduce the operational notion of conditional hybrid nonclassicality which relates to the ability to produce a nonclassical continuous-variable state by projecting onto a general superposition of discrete-variable subsystem. We discuss the importance of this form of quantumness in connection with interfaces for quantum communication. To verify the conditional hybrid nonclassicality, a matrix version of a nonclassicality quasiprobability is derived and its sampling approach is formulated. We experimentally generate an entangled, hybrid Schr\"odinger cat state, using a coherent photon-addition process acting on two temporal modes, and we directly sample its nonclassicality quasiprobability matrix. The introduced conditional quantum effects are certified with high statistical significance.
Cite
@article{arxiv.1702.04257,
title = {Conditional Hybrid Nonclassicality},
author = {E. Agudelo and J. Sperling and L. S. Costanzo and M. Bellini and A. Zavatta and W. Vogel},
journal= {arXiv preprint arXiv:1702.04257},
year = {2017}
}
Comments
Closer to published version