Experimental classical entanglement in a 16 acoustic qubit-analogue

M Arif Hasan; Keith Runge; Pierre A Deymier

doi:10.1038/s41598-021-03789-5

Experimental classical entanglement in a 16 acoustic qubit-analogue

Sci Rep. 2021 Dec 20;11(1):24248. doi: 10.1038/s41598-021-03789-5.

Authors

M Arif Hasan¹, Keith Runge², Pierre A Deymier²

Affiliations

¹ Department of Mechanical Engineering, Wayne State University, Detroit, MI, 48202, USA. hasan.arif@wayne.edu.
² Department of Materials Science and Engineering, The University of Arizona, Tucson, AZ, 85721, USA.

Abstract

The possibility of achieving and controlling scalable classically entangled, i.e., inseparable, multipartite states, would fundamentally challenge the advantages of quantum systems in harnessing the power of complexity in information science. Here, we investigate experimentally the extent of classical entanglement in a [Formula: see text] acoustic qubit-analogue platform. The acoustic qubit-analogue, a.k.a., logical phi-bit, results from the spectral partitioning of the nonlinear acoustic field of externally driven coupled waveguides. Each logical phi-bit is a two-level subsystem characterized by two independently measurable phases. The phi-bits are co-located within the same physical space enabling distance independent interactions. We chose a vector state representation of the [Formula: see text]-phi-bit system which lies in a [Formula: see text]-dimensional Hilbert space. The calculation of the entropy of entanglement demonstrates the possibility of achieving inseparability of the vector state and of navigating the corresponding Hilbert space. This work suggests a new direction in harnessing the complexity of classical inseparability in information science.