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Lasing without inversion in circuit quantum electrodynamics.

M Marthaler¹, Y Utsumi, D S Golubev

¹Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany.

Physical Review Letters

|September 21, 2011

Summary

This summary is machine-generated.

We demonstrate "lasing without inversion" in a qubit-oscillator system. Dissipation enhances photon emission, enabling lasing even without population inversion, a potentially observable effect in quantum circuits.

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Area of Science:

Quantum Optics
Circuit Quantum Electrodynamics

Background:

Population inversion in a qubit-coupled oscillator can induce lasing.
Previous studies focused on population inversion for lasing phenomena.

Purpose of the Study:

Investigate photon generation in a qubit-oscillator system with dissipation.
Explore the possibility of achieving lasing without population inversion.

Main Methods:

Theoretical analysis of a transmission line oscillator coupled to a driven qubit.
Modeling the influence of a dissipative electromagnetic environment.

Main Results:

Demonstrated a novel
lasing without inversion
regime.

Conclusions:

The dissipative environment enhances photon emission over absorption, enabling lasing without population inversion.
This effect is analogous to the atomic recoil effect but is expected to be more observable in realistic quantum circuits.
Analysis provides requirements for system parameters and environment for experimental realization.