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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Quantum Nonlinear Optics in Optomechanical Nanoscale Waveguides.

Hashem Zoubi¹, Klemens Hammerer¹

¹Institute for Theoretical Physics, Institute for Gravitational Physics (Albert Einstein Institute), Leibniz University Hannover, Appelstrasse 2, 30167 Hannover, Germany.

Physical Review Letters

|January 18, 2018

Summary

Strong nonlinearities at the few-photon level are achievable in nanoscale waveguides. This breakthrough enables enhanced quantum optics in optomechanical systems, paving the way for quantum computing applications.

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Area of Science:

Quantum Optics
Nanophotonics
Optomechanics

Background:

Stimulated Brillouin scattering (SBS) is enhanced by radiation pressure in nanophotonic structures.
Strong nonlinearities are crucial for quantum information processing.

Purpose of the Study:

To demonstrate strong nonlinearities at the few-photon level in nanoscale waveguides.
To explore the potential of optomechanical systems for quantum optics.

Main Methods:

Utilizing cm-scale 1D nanophotonic waveguides.
Employing two pump fields to slow down photons via SBS.
Leveraging radiation pressure coupling and phonon exchange.

Main Results:

Achieved significant photon slowing (several orders of magnitude).
Demonstrated strong nonlinear interactions via dispersionless phonons.
Identified requirements for large cross-phase modulation between photons.

Conclusions:

Strongly nonlinear quantum optics is feasible in continuum optomechanical systems.
Nanophotonic structures offer a promising platform for quantum technologies.
The proposed configuration is applicable for developing photonic quantum gates.