Energy-saving fast-forward scaling

TL;DR

This paper introduces an energy-efficient fast-forward scaling method that accelerates quantum dynamics while minimizing energy costs, demonstrated in two-level systems and quantum annealing, advancing quantum technology efficiency.

Contribution

It presents a novel energy-saving fast-forward scaling technique and explores its application to quantum systems, including strategies to reduce energy costs in time-dependent bases.

Findings

Energy costs of fast-forward scaling are quantifiable.

Energy-saving speedup is possible in time-independent bases.

Methods to mitigate energy costs in time-dependent bases are proposed.

Abstract

We propose energy-saving fast-forward scaling. Fast-forward scaling is a method which enables us to speed up (or slow down) given dynamics in a certain measurement basis. We introduce energy costs of fast-forward scaling, and find possibility of energy-saving speedup for time-independent measurement bases. As concrete examples, we show such energy-saving fast-forward scaling in a two-level system and quantum annealing of a general Ising spin glass. We also discuss the influence of a time-dependent measurement basis, and give a remedy for unwanted energy costs. The present results pave the way for realization of energy-efficient quantum technologies.