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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Multi-level quantum noise spectroscopy.
Youngkyu Sung1,2, Antti Vepsäläinen3, Jochen Braumüller3
1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, USA. youngkyu@mit.edu.
Nature Communications
|February 12, 2021
Summary
We developed a new quantum noise spectroscopy (QNS) method using superconducting qubits. This technique precisely identifies different noise sources, improving quantum system engineering.
Area of Science:
- Quantum computing
- Quantum information science
- Superconducting circuits
Background:
- Quantum noise spectroscopy (QNS) is vital for robust quantum systems.
- Current QNS methods often measure total noise but cannot differentiate specific noise sources.
Purpose of the Study:
- To introduce a novel spin-locking-based QNS protocol.
- To enhance the capability of distinguishing underlying noise mechanisms in quantum systems.
Main Methods:
- Exploited the multi-level energy structure of superconducting qubits.
- Employed a spin-locking technique for probing higher-excited energy levels.
- Experimentally validated the proposed QNS protocol.
Main Results:
- Extended the usable spectral range for weakly anharmonic qubit spectrometers.
- Successfully identified and distinguished contributions from different noise mechanisms.
- Demonstrated the protocol's effectiveness in characterizing complex noise environments.
Conclusions:
- The developed QNS protocol offers superior noise identification capabilities.
- This advancement is crucial for building more reliable and fault-tolerant quantum computers.
- The method overcomes limitations of existing QNS techniques by leveraging multi-level qubit properties.
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