Phase Stabilization of a Frequency Comb using Multipulse Quantum Interferometry

TL;DR

This paper introduces quantum protocols leveraging multipulse interferometry with atomic qubits to stabilize frequency comb phases, enhancing sensitivity without requiring octave-spanning combs or frequency doubling.

Contribution

It develops novel quantum protocols for phase stabilization of frequency combs using multipulse interferometry and atomic qubits, improving sensitivity polynomially with pulse number.

Findings

Polynomial sensitivity enhancement O(N^{-2}) with number of pulses

Protocols applicable to optical and hyperfine qubits, Lambda-schemes, and Raman transitions

Methods using phase-stable cw-lasers or frequency combs as references

Abstract

From the interaction between a frequency comb and an atomic qubit, we derive quantum protocols for the determination of the carrier-envelope offset phase, using the qubit coherence as a reference, and without the need of frequency doubling or an octave spanning comb. Compared with a trivial interference protocol, the multipulse protocol results in a polynomial enhancement of the sensitivity O(N^{-2}) with the number N of laser pulses involved. We present specializations of the protocols using optical or hyperfine qubits, Lambda-schemes and Raman transitions, and introduce methods where the reference is another phase-stable cw-laser or frequency comb.