Fidelity of the quantum delta-kicked accelerator

TL;DR

This paper investigates how the fidelity of a quantum delta-kicked accelerator responds to acceleration, using Bose-Einstein condensates and pulse sequences, with potential applications in atomic temperature measurement.

Contribution

It provides experimental and theoretical analysis of fidelity sensitivity to acceleration in a quantum system, introducing a novel method for precision measurement.

Findings

Fidelity spectrum varies with acceleration.

Experimental and theoretical agreement demonstrated.

Potential for atomic temperature measurement applications.

Abstract

The sensitivity of the fidelity in the kicked rotor to an acceleration is experimentally and theoretically investigated. We used a Bose-Einstein condensate exposed to a sequence of pulses from a standing light wave followed by a single reversal pulse in which the standing wave was shifted by half a wavelength. The features of the fidelity "spectrum" as a function of acceleration are presented. This work may find application in the measurement of temperature of an atomic sample.