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Photon blockade with a trapped Λ-type three-level atom in asymmetrical cavity.

Xue-Chen Gao, Xiao-Jie Wu, Cheng-Hua Bai

|November 29, 2023

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We demonstrate a method to control strong and nonreciprocal photon blockade in an asymmetrical cavity using a three-level atom. This technique enables the generation of high-quality nonreciprocal single-photon sources.

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Area of Science:

Quantum optics
Cavity quantum electrodynamics
Atomic physics

Background:

Photon blockade is crucial for generating single photons.
Controlling photon blockade properties is essential for quantum technologies.
Asymmetrical cavities and three-level atoms offer unique quantum manipulation possibilities.

Purpose of the Study:

To propose a scheme for manipulating strong and nonreciprocal photon blockade.
To achieve control over photon blockade using an asymmetrical Fabry-Perot cavity and a Λ-type three-level atom.
To enable the generation of high-quality nonreciprocal single-photon sources.

Main Methods:

Utilizing both conventional and unconventional photon blockade mechanisms.
Employing an anharmonic eigenenergy spectrum from the Λ-type atom.
Inducing destructive quantum interference with a microwave field.
Breaking spatial symmetry using an asymmetrical cavity.

Main Results:

Achieved strong photon blockade through atomic anharmonicity and quantum interference.
Demonstrated tunable strong photon blockade over a wide cavity detuning range.
Realized direction-dependent nonreciprocal photon blockade by breaking cavity symmetry.
Showcased manipulation of nonreciprocal photon blockade position via cavity detuning.

Conclusions:

The proposed scheme offers a feasible method for generating high-quality nonreciprocal single-photon sources.
The control over photon blockade properties opens avenues for advanced quantum applications.
This work highlights the potential of asymmetrical cavities and Λ-type atoms in quantum information processing.