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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Inelastic microwave photon scattering off a quantum impurity in a Josephson-junction array.

Moshe Goldstein¹, Michel H Devoret, Manuel Houzet

¹Department of Physics, Yale University, New Haven, Connecticut 06520, USA.

Physical Review Letters

|February 7, 2013

Summary

Quantum fluctuations in superconducting circuits allow frequency conversion of single photons. This research reveals Kondo physics in Josephson junction arrays, offering new insights into many-body quantum phenomena.

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Area of Science:

Quantum optics
Condensed matter physics
Superconducting circuits

Background:

Quantum fluctuations in superconducting circuits can be harnessed for quantum information processing.
Anharmonicity in superconducting circuits is crucial for nonlinear effects like frequency conversion.
Josephson junction arrays can exhibit complex quantum phenomena, including impurity effects.

Purpose of the Study:

To investigate frequency conversion of individual photons using quantum fluctuations in an anharmonic superconducting circuit.
To explore the manifestation of Kondo physics in a superconducting circuit with weak links.
To evaluate photon scattering cross sections and their relation to many-body properties.

Main Methods:

Utilizing quantum fluctuations in an anharmonic superconducting circuit for photon frequency conversion.
Modeling photon scattering off weak links in a Josephson junction array.
Analyzing elastic and inelastic photon scattering cross sections.

Main Results:

Demonstrated frequency conversion of individual photons, linear in intensity.
Identified Kondo physics in a quantum impurity within the Josephson junction array.
Obtained photon scattering cross sections revealing many-body Kondo properties.

Conclusions:

Quantum fluctuations in anharmonic superconducting circuits provide a novel mechanism for photon frequency conversion.
The studied quantum impurity in a Josephson junction array exhibits Kondo physics.
Photon scattering cross sections offer a new experimental window into many-body Kondo physics, complementary to fermionic systems.