A macrorealistic test in hybrid quantum optomechanics. (9th March 2020)

• Record Type: Journal Article
• Authors: Marchese, Marta; McAleese, Hannah; Bassi, Angelo; Paternostro, Mauro
• Is Part Of: Journal of physics. Volume 53:Number 7(2020:Apr. 01)
• Publication Date: 2020-03-09
• Subjects: Leggett–Garg -- optomechanics -- foundations -- temporal correlations; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/1361-6455/ab6d18
• Languages: English
• ISSNs: 0953-4075

Abstract

Abstract: We discuss a scheme for macrorealistic theories of the Leggett–Garg form (Leggett and Garg 1985 Phys. Rev. Lett. 54 857). Our scheme is based on a hybrid optomechanical system. It seems reasonable to test these inequalities with an optomechanical system, since in an optomechanical cavity it is possible to create non-classical states of the mirror through a projective measurement on the cavity field. We will present the protocol to generate such non-classicality for a general optomechanical cavity and after we will carry out a theoretical test for one of the possible formulations of these inequalities using a hybrid optomechanical system. Specifically, the inequality will be investigated for an harmonic oscillator coupled to a two-level system, which replaces the light field of the cavity. The aim is to reproduce, with this system, the evolution of a single spin-1/2 for which the inequality is violated; this is achievable through the conditioning of the two-level system which will be used as an ancilla.