School of Mathematical Sciences

Mass-Independent Scheme to Test the Quantumness of a Massive Object

Date(s)
Wednesday 17th April 2024 (14:00-15:00)
Contact
Event Convenor Contact: gerardo.adesso@nottingham.ac.uk
Description
Speaker's Name: Debarshi Das
Speaker's Affiliation: University College London
Speaker's Research Theme(s): Quantum information and metrology,Gravity
Abstract:
The search for empirical schemes to evidence the nonclassicality of large masses is a central quest of current research. However, practical schemes to witness the irreducible quantumness of an arbitrarily large mass are still lacking. To this end, we incorporate crucial modifications to the standard tools for probing the quantum violation of the pivotal classical notion of macrorealism (MR): while usual tests use the same measurement arrangement at successive times, here we use two different measurement arrangements. This yields a striking result: a mass-independent violation of MR is possible for harmonic oscillator systems. In fact, our adaptation enables probing quantum violations for literally any mass, momentum, and frequency. Moreover, coarse-grained position measurements at an accuracy much worse than the standard quantum limit, as well as knowing the relevant parameters only to this precision, without requiring them to be tuned, suffice for our proposal. These should drastically simplify the experimental effort in testing the nonclassicality of massive objects ranging from atomic ions to macroscopic mirrors in LIGO. -- Ref.: Debarshi Das, Dipankar Home, Hendrik Ulbricht, Sougato Bose, Physical Review Letters 132, 030202 (2024).

Venue: Physics C04

School of Mathematical Sciences

The University of Nottingham
University Park
Nottingham, NG7 2RD

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