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Related Experiment Video

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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Dispersive nonreciprocity between a qubit and a cavity.

Ying-Ying Wang¹, Yu-Xin Wang², Sean van Geldern¹

¹Department of Physics, University of Massachusetts-Amherst, Amherst, MA, USA.

Science Advances

|April 17, 2024

Summary

Researchers experimentally demonstrated a nonreciprocal dispersive interaction between a superconducting qubit and a cavity. This quantum nonreciprocity arises from dissipative intermediary modes, enabling asymmetric frequency shifts and dephasing for quantum technologies.

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Area of Science:

Quantum Information Science
Quantum Optics
Superconducting Circuits

Background:

Dispersive interactions between qubits and cavities are fundamental in quantum electrodynamics.
These interactions are typically bidirectional (reciprocal) in closed systems.
Nonreciprocity is crucial for developing advanced quantum devices.

Purpose of the Study:

To experimentally investigate a nonreciprocal dispersive interaction between a transmon qubit and a superconducting cavity.
To characterize the dynamics of this nonreciprocal interaction, including frequency shifts and dephasing.
To develop a general theoretical model for nonreciprocal dispersive interactions.

Main Methods:

Experimental realization of a transmon qubit coupled to a superconducting cavity via dissipative intermediary modes.
In situ tuning of a ferrite component's magnetic field bias to control the degree of nonreciprocity.
Characterization of qubit-cavity dynamics, including asymmetric frequency pulls and photon shot noise dephasing.
Development of a general master equation model for dispersive nonreciprocal interactions.

Main Results:

Demonstration of a nonreciprocal dispersive interaction between a qubit and a cavity.
Observation of asymmetric frequency shifts and photon shot noise dephasing.
Successful characterization of qubit-cavity dynamics under varying nonreciprocity.
Introduction of a versatile master equation model applicable to various nonreciprocal systems.

Conclusions:

Experimental evidence of nonreciprocal dispersive interactions in superconducting circuits.
The study provides a new avenue for quantum device engineering beyond traditional paradigms.
The developed model offers a unified description of nonreciprocal quantum phenomena.