Autonomous quantum clocks using athermal resources

TL;DR

This paper investigates quantum clocks driven by athermal resources, utilizing measurement-engineered reservoirs to produce ticks, and analyzes their statistical properties, accuracy, and potential implementations, highlighting quantum advantages over classical clocks.

Contribution

It introduces a novel quantum clock model driven by measurement-engineered reservoirs and analyzes its statistical and performance characteristics, including sub-Poissonian tick distributions.

Findings

Ticking rate maximized when measured observable non-commutes with Hamiltonian

Clock ticks can exhibit sub-Poissonian statistics, indicating quantum behavior

Framework extended to hybrid quantum clocks with measurement and thermal resources

Abstract

Here we explore the possibility of precise time-keeping in quantum systems using athermal resources. We show that quantum measurement engineered reservoirs can be used as athermal resources to drive the ticks of a quantum clock. Two and three level quantum systems act as transducers in our model, converting the quantum measurement induced noise to produce a series of ticks. The ticking rate of the clock is maximized when the measured observable maximally non-commutes with the clock's Hamiltonian. We use the large deviation principle to characterize the statistics of observed ticks within a given time-period and show that it can be sub-Poissonian -- quantified by Mandel's Q parameter -- alluding to the quantum nature of the clock. We discuss the accuracy and efficiency of the clock, and extend our framework to include hybrid quantum clocks fueled by both measurements, and thermal resources. We make comparisons to relatable recent proposals for quantum clocks, and discuss alternate device implementations harvesting the quantum measurement engineered non-equilibrium conditions, beyond the clock realization.