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Phonon blockade in a nanomechanical resonator quadratically coupled to a two-level system
Hai-Quan Shi1,2, Xun-Wei Xu2, Nian-Hua Liu3,4
1School of Materials Science and Engineering, Nanchang University, Nanchang, 330031, China.
Scientific Reports
|June 21, 2019
Summary
We observed unconventional phonon blockade in a nanomechanical resonator (NAMR) using quantum interference. Increasing drive strength transitions this to conventional phonon blockade, which can be further enhanced by optimizing driving fields.
Area of Science:
- Quantum physics
- Nanotechnology
- Condensed matter physics
Background:
- Nanomechanical resonators (NAMRs) are crucial for quantum information processing.
- Understanding phonon statistics is key to controlling quantum states.
- Quantum interference offers novel pathways for manipulating quantum systems.
Purpose of the Study:
- To investigate phonon statistics in a quadratically coupled NAMR-two-level system.
- To explore the conditions for unconventional phonon blockade (UCPNB) and conventional phonon blockade (CPNB).
- To analyze the role of quantum interference and driving field strengths in phonon blockade.
Main Methods:
- Simultaneous driving of the NAMR and the coupled two-level system.
- Analysis of phonon statistics, focusing on antibunching effects.
- Systematic variation of driving field strengths and coupling conditions.
Main Results:
- UCPNB, characterized by strong phonon antibunching, is observed under weak driving fields.
- A crossover from UCPNB to CPNB occurs with increasing driving field strength, driven by nonlinear interactions.
- Quantum interference can enhance CPNB under strong coupling by optimizing the phase difference of driving fields.
Conclusions:
- Phonon blockade in NAMRs can be controlled through driving field strengths and quantum interference.
- UCPNB provides a distinct mechanism for phonon antibunching compared to CPNB.
- The findings offer new strategies for engineering quantum states and enhancing phonon blockade in quantum devices.
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