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Deterministic Loading of Microwaves onto an Artificial Atom Using a Time-Reversed Waveform.
Wei-Ju Lin1, Yong Lu2,3, Ping Yi Wen4
1Department of Physics, National Tsing Hua University, Hsinchu30013, Taiwan.
Nano Letters
|October 6, 2022
Summary
Researchers efficiently loaded quantum information onto superconducting artificial atoms using precisely shaped microwave photons. This breakthrough in waveguide quantum electrodynamics is key for developing robust quantum networks.
Area of Science:
- Quantum physics
- Quantum information science
- Superconducting circuits
Background:
- Deterministic loading of quantum information onto quantum nodes is crucial for quantum network development.
- Superconducting artificial atoms in waveguides are promising quantum nodes.
Purpose of the Study:
- To demonstrate efficient loading of quantum information onto a superconducting artificial atom.
- To investigate the role of optimal temporal waveforms and time-reversal symmetry in this process.
Main Methods:
- Utilized coherent-state microwave photons with an exponentially rising temporal waveform.
- Employed a single superconducting artificial atom coupled to a semi-infinite 1D transmission-line waveguide.
- Matched the waveform's time constant to the artificial atom's decoherence time.
Main Results:
- Achieved a high loading efficiency of 94.2% ± 0.7% from 1D semi-free space to the artificial atom.
- Demonstrated a time-reversal symmetry overlap of up to 97.1% ± 0.4%, explaining the high efficiency.
- Showcased the effectiveness of weak coherent states with optimized waveforms.
Conclusions:
- Efficient deterministic loading of quantum information onto superconducting artificial atoms is achievable.
- Time-reversal symmetry plays a critical role in maximizing loading efficiency.
- This work advances the development of quantum networks based on waveguide quantum electrodynamics.
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