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Related Experiment Video

Updated: Apr 19, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Asymmetric frequency conversion in nonlinear systems driven by a biharmonic pump.

Archana Kamal¹, Ananda Roy², John Clarke³

¹Departments of Physics and Applied Physics, Yale University, New Haven, Connecticut 06520, USA and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters

|December 27, 2014

Summary

This study reveals a new method for asymmetric frequency conversion in nonlinear devices using a biharmonic pump. Controlling the pump

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Area of Science:

Nonlinear Optics
Quantum Electronics
Condensed Matter Physics

Background:

Frequency conversion is crucial in nonlinear optics and quantum electronics.
Parametric driving in nonlinear dispersive devices enables frequency manipulation.
Achieving directional control in frequency conversion remains a challenge.

Purpose of the Study:

To investigate a novel mechanism for asymmetric frequency conversion.
To explore nonreciprocal frequency conversion (upward or downward) using a biharmonic pump.
To demonstrate the practical realization of this effect in a Josephson junction system.

Main Methods:

Parametric driving of nonlinear dispersive devices with a biharmonic pump.
Tuning the relative phase between the first and second harmonics of the pump.
Utilizing a current-biased, resistively shunted Josephson junction as a model system.

Main Results:

A novel mechanism for asymmetric frequency conversion was identified.
Nonreciprocal frequency conversion (upward or downward) achieved by tuning pump phase.
Full directionality and efficiency demonstrated by optimizing pump power distribution.

Conclusions:

The study presents a generic mechanism for asymmetric frequency conversion.
A practical realization using Josephson junctions and their internal oscillations is shown.
This work offers new possibilities for directional control in frequency conversion.