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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.
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.
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