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Updated: Feb 10, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Frequency Combs in a Lumped-Element Josephson-Junction Circuit.

Saeed Khan¹, Hakan E Türeci¹

¹Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.

Physical Review Letters

|May 15, 2018

Summary

This study reveals self-oscillations and frequency combs in a driven Josephson junction system. Strong quantum fluctuations cause spectral peak broadening and disappearance, impacting systems without classical fixed points.

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Area of Science:

Quantum optics
Condensed matter physics
Nonlinear dynamics

Background:

Josephson junctions are key components in quantum electronics.
Coupling to LC oscillators introduces nonlinearity.
Previous work showed bistability in phase and amplitude.

Purpose of the Study:

Characterize the full phase diagram of the driven system.
Investigate the mechanism of frequency comb generation.
Analyze the effect of quantum fluctuations on spectral properties.

Main Methods:

Theoretical investigation of a microwave-driven Josephson junction coupled to an LC oscillator.
Analysis of system dynamics in different parameter regimes.
Study of spectral properties under varying nonlinearity and dissipation.

Main Results:

Identified a regime of self-oscillations with a frequency comb spectrum.
Proposed a novel mechanism for comb generation distinct from lasers and microcavities.
Observed dephasing due to quantum fluctuations, leading to spectral broadening and peak disappearance.

Conclusions:

The system exhibits complex dynamics including self-oscillations and frequency combs.
Quantum fluctuations play a crucial role in shaping spectral features.
This research provides insight into quantum systems lacking classical fixed points.