sampreet / blockade_mag

Unconditional magnon blockade in a hybrid system

Quantum Interference Induced Magnon Blockade and Antibunching in a Hybrid Quantum System

J. Opt. Soc. Am. B 41, 447 (2024)

Author	Affiliation
Pooja Kumari Gupta	Indian Institute of Technology Guwahati, Guwahati-781039, India
Sampreet Kalita	Indian Institute of Technology Guwahati, Guwahati-781039, India
Amarendra Kumar Sarma	Indian Institute of Technology Guwahati, Guwahati-781039, India

Contributing Part	PKG	SK
Literature review	90%	10%
Idea and formulation	100%	0%
Derivations of expressions	60%	40%
Parameter sweeping	90%	10%
Illustrations and plots	50%	50%
Results and discussion	60%	40%
Manuscript preparation	70%	30%

About the Work

In this work, we study the phenomena of quantum interference assisted magnon blockade and magnon antibunching in a weakly interacting hybrid ferromagnet-superconductor system. The magnon excitations in two yttrium iron garnet spheres are indirectly coupled to a superconducting qubit through microwave cavity modes of two mutually perpendicular cavities. We find that when one of the magnon mode is driven by a weak microwave field, the destructive interference between more than two distinct transition pathways restricts simultaneous excitation of two magnons. We analyze the magnon correlations in the driven magnon mode for the case of zero detunings as well as finite detunings of the magnon modes and the qubit. We show that the magnon antibunching can be tuned by changing the magnon-qubit coupling strength ratio and the driving detuning. Our work proposes a possible scheme which have significant role in the construction of single magnon generating devices.

Notebooks

• Blockade Condition
• Plots in the Latest Version of the Manuscript

Structure of the Repository

ROOT_DIR/
|
├───common/
│   ├───foo.py
│   └───...
|
├───data/
│   ├───bar/
│   │   ├───baz_xyz.npz
│   │   └───...
│   └───...
|
├───notebooks/
│   ├───bar/
│   │   ├───baz.ipynb
│   │   └───...
│   │
│   ├───foo.ipynb
│   └───...
|
│───scripts/
│   ├───bar/
│   │   ├───baz.py
│   │   └───...
│   └───...
│
├───.gitignore
├───CHANGELOG.md
└───README.md

Here, bar represents the version.

Note: Some data files have been excluded from this repository to fit GitHub's storage limits without using Git LFS services. These data files can also be generated by running their corresponding scripts.

Installing Dependencies

All numerical values are calculated using QuTiP, a Python framework for the dynamics of open quantum systems. Refer to the QuTiP documentation for the steps to install this library.

All plots are obtained using the Quantum Optomechanics Toolbox, an open-source Python framework to simulate optomechanical systems. Refer to the QOM toolbox documentation for the steps to install this libary.

Running the Scripts

To run the scripts, navigate inside the top-level directory, and execute:

python scripts/bar/baz.py

Here, bar is the name of the folder (containing the version information) inside scripts and baz.py is the name of the script (refer to the repository structure).