Trajectories without quantum uncertainties

TL;DR

This paper demonstrates that quantum trajectories measured relative to a reference system with an effective negative mass can be free of quantum uncertainties, enabling ultra-sensitive measurements beyond the standard quantum limit.

Contribution

It introduces a method to achieve quantum uncertainty--free trajectories using entangled states with an effective negative mass, surpassing traditional measurement limits.

Findings

Quantum trajectories can be made uncertainty-free with negative mass references.

Entanglement with negative mass systems enables surpassing the standard quantum limit.

Potential for ultra-sensitive force and acceleration measurements.

Abstract

A common knowledge suggests that trajectories of particles in quantum mechanics always have quantum uncertainties. These quantum uncertainties set by the Heisenberg uncertainty principle limit precision of measurements of fields and forces, and ultimately give rise to the standard quantum limit in metrology. With the rapid developments of sensitivity of measurements these limits have been approached in various types of measurements including measurements of fields and acceleration. Here we show that a quantum trajectory of one system measured relatively to the other "reference system" with an effective negative mass can be quantum uncertainty--free. The method crucially relies on the generation of an Einstein-Podolsky-Rosen entangled state of two objects, one of which has an effective negative mass. From a practical perspective these ideas open the way towards force and acceleration measurements at new levels of sensitivity far below the standard quantum limit.