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Nonreciprocal magnon blockade via the Barnett effect
Optics Letters
|February 1, 2024
Summary
We demonstrate nonreciprocal magnon blockade in a hybrid system using the Barnett effect. This allows for tunable switching between efficient and pure single-magnon blockade, paving the way for novel quantum magnetic devices.
Area of Science:
- Quantum physics
- Condensed matter physics
- Magnonics
Background:
- Magnon blockade is crucial for quantum information processing.
- Achieving nonreciprocity in magnonic systems is challenging.
- The Barnett effect offers a potential mechanism for magnetic nonreciprocity.
Purpose of the Study:
- To propose and demonstrate a scheme for nonreciprocal magnon blockade.
- To explore the role of the Barnett effect in achieving nonreciprocity.
- To investigate the tunability and characteristics of nonreciprocal magnon blockade.
Main Methods:
- Utilizing a rotating yttrium iron garnet (YIG) sphere in a hybrid system.
- Controlling the magnetic field direction to tune the Barnett shift.
- Analyzing the emergence of unconventional magnon blockade (UMB) and conventional magnon blockade (CMB).
Main Results:
- Nonreciprocal UMB was achieved, dependent on magnetic field direction.
- Simultaneous observation of nonreciprocal CMB and UMB was demonstrated.
- Tunable switching between UMB efficiency and CMB purity was realized.
- Stronger qubit-magnon coupling enhanced UMB, even in the strong coupling regime.
- The nonreciprocity of magnon blockade was found to be temperature-sensitive.
Conclusions:
- The Barnett effect enables tunable nonreciprocal magnon blockade in hybrid systems.
- This work provides a method for switching between efficient and pure single-magnon blockade.
- The findings open avenues for developing quantum nonreciprocal magnetic devices and chiral magnon communications.
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