Conceptual Design of a Micron-Scale Atomic Clock

TL;DR

This paper proposes a micron-scale atomic clock using endohedral fullerenes and GMR sensors, promising low power consumption, high stability, and compatibility with chip fabrication.

Contribution

It introduces a novel design for a micron-sized atomic clock integrating endohedral fullerenes with GMR sensors, enabling miniaturization and improved robustness.

Findings

Potential for extremely low power operation (nanowatts)

High vibration and shock resistance

Stability on the order of 10^{-9}

Abstract

A theoretical proposal for reducing an entire atomic clock to micron dimensions. A phosphorus or nitrogen atom is introduced into a fullerene cage. This endohedral fullerene is then coated with an insulating shell and a number of them are deposited as a thin layer on a silicon chip. Next to this layer a GMR sensor is fabricated which is close to the endohedral fullerenes. This GMR sensor measures oscillating magnetic fields on the order of micro-gauss from the nuclear spins varying at the frequency of the hyperfine transition (413 MHz frequency). Given the micron scale and simplicity of this system only a few transistors are needed to control the waveforms and to perform digital clocking. This new form of atomic clock exhibits extremely low power (nano watts), high vibration and shock resistance, stability on the order of 10^{-9}, and is compatible with MEMS fabrication and chip integration. As GMR sensors continue to improve in sensitivity the stability of this form of atomic clock will increase proportionately.