Back-action-free quantum optomechanics with negative-mass Bose-Einstein condensates

TL;DR

This paper proposes using negative effective mass in Bose-Einstein condensates to create a back-action-free quantum optomechanical system, enabling quantum measurements unaffected by quantum back-action.

Contribution

It introduces a novel method to exploit dispersion management in BECs to achieve negative effective mass, creating a quantum-mechanics-free subsystem.

Findings

Negative effective mass can be achieved via optical lattice modulation.

The system exhibits properties opposite to positive-mass systems, such as negative temperature.

A back-action-free measurement scheme is theoretically possible.

Abstract

We propose that the dispersion management of coherent atomic matter waves can be exploited to overcome quantum back-action in condensate-based optomechanical sensors. The effective mass of an atomic Bose-Einstein condensate modulated by an optical lattice can become negative, resulting in a negative-frequency optomechanical oscillator, a negative environment temperature, and optomechanical properties opposite to those of a positive-mass system. This enables a quantum-mechanics-free subsystem insulated from quantum back-action.