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Published on: April 12, 2018
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Eigenstate control of plasmon wavepackets with electron-channel blockade.
Shintaro Takada1,2,3,4, Giorgos Georgiou5, Junliang Wang6
1National Institute of Advanced Industrial Science and Technology (AIST), National Metrology Institute of Japan (NMIJ), Tsukuba, Ibaraki, Japan. takada@phys.sci.osaka-u.ac.jp.
Nature Communications
|November 12, 2025
Summary
Researchers precisely control plasmon wavepackets in solid-state systems using a cavity. This technique enables stable quantum plasmonic circuits by isolating electron conduction channels and managing charge fractionalisation.
Area of Science:
- Quantum electronics
- Solid-state physics
- Nanoscale device engineering
Background:
- Coherent manipulation of plasmon wavepackets is key for quantum information processing using propagating quantum bits.
- Controlling plasmon wavepacket eigenstates is vital for determining their speed and the number of quantum operations possible.
- Charge fractionalisation, where plasmon wavepackets spread across multiple electron conduction channels, complicates precise manipulation in quantum circuits.
Purpose of the Study:
- To demonstrate a method for isolating and selecting electron conduction channels for plasmon excitation.
- To enable precise control over plasmon eigenstates and their propagation characteristics.
- To enhance the stability and predictability of plasmonic circuits for quantum applications.
Main Methods:
- Utilizing a cavity to isolate specific electron conduction channels involved in plasmon excitation.
- Observing the electron-channel blockade effect to suppress charge fractionalisation.
- Analyzing the impact of plasmon's narrow energy distribution on channel selection.
Main Results:
- Demonstrated the ability to isolate and select electron conduction channels contributing to plasmon excitation.
- Observed an electron-channel blockade effect, suppressing charge fractionalisation into cavity-confined channels.
- Achieved precise control over plasmon eigenstates, leading to more stable plasmonic circuits.
Conclusions:
- A cavity-based technique allows for precise control of plasmon eigenstates by selecting electron conduction channels.
- The electron-channel blockade effect enhances the stability of plasmonic circuits by managing charge fractionalisation.
- This method offers a versatile tool for designing tailored plasmonic circuits for quantum information processing.
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